Ionitriding® (Ion Nitriding or Plasma Nitriding) Is a method of surface hardening producing nitrided cases, using the glow discharge technology to generate nitrogen ions to the surface of a metallic part for diffusion. The gamma prime is more ductile than the epsilon layer. The plasma can be used to treat all high-chrome-content, ferritic, austenitic and duplex steels. Product with a surface finish higher than 30 RMS may exhibit premature wear due to the surface roughness and parts under 15 RMS will need to be polish after processin. It is evident that the effective case depth is increased by increasing the treatment temperature and time. This process is done in a vacuum vessel at low temperatures (750°-1040°F or 400°-560°C) and can be applied to any ferrous metal. 0.025 – 1.00. All Rights Reserved. The surface should be cleaned by sand blasting prior to renitriding. Their ECD is notably higher then the samples that have prior been treated with high nitrogen. Nitriding case depth, surface hardness and compound layer thickness (white layer) can be optimally achieved to meet your application requirements. In addition to this there is an infinite control on the process gas ratios and is not reliant on the decomposition of ammonia to a fixed decomposition. The slope is more gradual for low alloy steels and very sharp for highly alloyed steels. There are fundamental differences between the two processes. 0.025 – 0.70. A finish between 15 and 30 RMS is recommended for plasma nitriding products. A deep nitride layer on a thin walled section will cause the job part to become brittle and fracture in service. Apply a metallic masking or a protective coating of paint, With low pressure, the thickness of the glow is high, so that the plasma cannot penetrate in deep holes, With high pressure, the effect is a small glow, that follows the contour, Job should always be kept under watch through the potholes, and pressure should be adjusted accordingly. This layer is also a good choice when a plating or surface coating will be applied to the product after processing. The excess nitrides diffuse into the gear material during the heat-treating cycle, leaving a white layer on the top surface. This white layer is brittle and relatively inert. Fatigue strength is increased mainly by the development of surface compressive stresses. A uniform glow discharge that envelops the entire surface achieves a consis- tent hardness and case depth. NCT recommends products to be stress relieved at 1050 Fahrenheit. Nitriding is most commonly carried out on prehardened alloy steels like 4140, 4340 or Nitralloy 135M. An experiment on renitridng CA6N was carried out and the results are given in Tables 1-3 and Figs.1-5. Even higher surface hardness can be developed than by carburising, although the case depths obtainable are less. The depth of nitriding hardness may reach 500 μm with maximum hardness levels of > 1000 HV. The advantages of gaseous nitriding processes can be surpassed by plasma nitriding. 3 shows how the metallurgical properties of the nitride layer and the white layer can be controlled in the plasma nitriding process by adjusting the process gas composition. 14-8. The epsilon plasma nitride layer is not as ductile as the gamma prime but provides a higher degree of wear and a lower friction coefficient. Fig. Gear hub, bore and web faces have been masked to prevent nitriding to allow for post heat treatment machining. Gear measures 12' in diameter by 12' tall and weighs approximately 24,000 pounds. Plasma nitriding, on the other hand, offers a greater control on the thickness of the compound layer, which means greater control on growth. These can be increased considerably through plasma nitriding. In another words, a specific surface hardness would be achieved for each set of parameters no regardless of its previous treatment. With a wide range of process control and optimization possibilities, plasma nitriding makes it possible to achieve stringent requirements not capable by gas or salt bath nitriding. EN3A, 070M20, 080M40, Mild Steels. Plasma nitriding allows faster nitriding times, and the quickly attained surface saturation of the plasma process results in faster diffusion. The case depth may be as high as 900 µm. Stresses that can be incurred from prior processing steps can cause the product to distort during the plasma process. File Hard 0.0005". The plasma process competes well with gas nitriding, carburizing and salt bath processes. Pulse plasma nitriding systems deliver more uniform case-hardening and increased speed of processing when treating high wear industrial components. A typical Carbonitriding process cycle using the FC35 25. However, this is at the expanse of increasing its ECD. Considering the bulk hardness, surface sputtering, and nitride case depth, it appeared that nitriding at 454 °C for up to 15 h that produced a case depth of about 120 µm may be the optimal condition. 0.025 – 0.50 The high alloy content of the stainless steel creates a high surface hardness and a sharp transition zone between the nitrided surface and the core material. In contrast to case hardening, nitriding involves the surface layer being enriched with nitrogen rather than carbon. Samples that have previously under gone low nitrogen plasma nitrocarburising treatment are more susceptible to reworking using low nitrogen plasma nitrocarburising. Titanium and … Be sure to see a part during the treatment through the porthole. Plasma nitriding normally occurs at temperatures of 450 to 600 °C in a vacuum with the aid of plasma generated by a glow discharge on the workpiece surface. Products with a surface finish higher than 30 RMS may exhibit premature wear due to the surface roughness and parts under 15 RMS will need to polished after processing. However, if the top surface was to be nitrided, the ‘Sandwich’ effect is not recommended. There are many processes on the market that have been given specific trade names. The effective case depths of plasma nitrided specimens are also presented in Table 2 based on 400 HV. A special technical feature of this process is the possibility of using mechanical masking to provide accurate partial nitriding. Plasma nitriding allows faster nitriding times, and the quickly attained surface saturation of the plasma process results in faster diffusion. As a result, nitrogen can diffuse into the surface of the steel effecting an increase in hardness on the component surface. Fatigue strength is increased mainly by the development of surface compressive stresses. The micrograph in Fig. The Plasma nitriding process produces a hard outer skin on the material being nitrided. This process is sometimes referred to as ion nitrocarburizing or plasma ferritic nitrocarburizing (FNC). H13, H11, D2, Hot Work Tool Steel. The compound layer generally ranges from 0.0002" to 0.0012". The graph in Fig. Plasma Nitrided Surface Hardness. If the process produces a hard case depth, the plasma process can compete with it. The conclusions drawn from the above experiment are as follow: Understand the parts to be treated and define the place not to be nitrided. Plasma nitriding is a smart choice whenever parts are required to have both nitrided and soft areas. 0.002-0.010. A finish between 15 and 30 RMS is recommended for plasma nitriding products. 14-8. When the nitrogen ions bombard the part they heat up the metal, clean the surface, and absorb nitrogen into the surface. Nitriding THE NITRIDING PROCESS, first developed in the early 1900s, con-tinues to play an important role in many industrial applications. The nitrided part can be renitrided to meet the case depth requirement. Nitriding is a heat treating process that diffuses nitrogen into the surface of a metal to create a case-hardened surface. Workpieces made of ferrous materials exhibit better wear, strength and corrosion properties after nitriding. The "white layer" or compound layer will only build to between 0.0001 and 0.0004". Nitriding may be done in electric-heating furnaces. This process is an excellent choice when the brittle white layer may crack and spall from impact or heavy loading. EN40, 722M24, 31CrMoV9. The components to … Nitriding. The overall appearance of a nitrided product is a chalky gray color. 52-58. Copyright © 2006 TPP Information Centre. 0.100 – 1.00. Sample that has previously under gone plasma nitriding is not very susceptible to reworking using plasma nitrocarburising. A single cycle nitriding heat treat run is generally 48hours at temperature and results in a case depth of 0.015 – 0.020″. Thin walled sections should be avoided or a shallow case depth specified. Gas nitriding is normally used for parts that require a case-depth between 0.2 and 0.7 mm. The Plasma nitriding process produces a hard outer skin on the material being nitrided. If the glow is not uniform, pressure should be increase. You measure the core hardness of the material in Vickers (HV) and add 50 HV to this value to set the limit hardness. Since warming up and cooling down occurs slowly and the basic structure does not undergo any transfor- mation or change in volume, there is only a low risk of deformation. +0.4 -0.5 effective case depth A wide range of furnace sizes is available with the possibility of Plasma Nitriding parts up to 1.8m in diameter and 2.8m in height. 12/11/20, 12:21 PM | Processing & Handling, Design & Development | Power PR. However, this increase is not uniform. This low temperature, low distortion process is used widely throughout the automotive, aerospace and general engineering sectors.  Its carried out in a salt bath or in a furnace gas atmosphere. Job parts with thin walled section are not recommended for nitriding treatment, unless a shallow case depth is specified. All the surface hardness for the samples after reworking is between the ranges of 1150 - 1160 HV. Material. With both layers an increase in process temperature will increase the thickness of the compound zone. The nitrided part can be renitrided to meet the case depth requirement. The low alloy steel will provide a deeper case depth but a lower overall hardness. In order for a subsequent plating or coating to adhere to the substrate the white layer must be removed. The ion nitriding process is carried out in a vacuum vessel where a high-voltage electrical charge forms plasma, causing nitrogen ions to accelerate and impinge on the metal. However, times for gas nitriding can be quire long, that is, from 10 to 130 h depending on the application, and the case depths are relatively shallow, usually less than 0.5 mm. 105 York Street The nitride case provides a hard, wear resistant surface without spalling, galling or brittleness seen in conventional nitriding. 8620, 9310, 9315, P6. Plasma nitriding can also clean the surface by sputtering. Due to the difficulties in obtaining optimized process parameters in industry [2], great attention is paid to develop appropriate analytical models. Case Depth mm. Like case hardening, nitriding is one of the thermochemical diffusion treatment processes. Plasma-Nitriding Nitriding with compound layer (DIN 1.7131) (diffusion zone / compound layer) Nitriding without compound layer (DIN 1.4122) (diffusion zone) 100 μm 50 μm 100 μm Representation of the nitride case depth Further advantages of plasma-nitriding technique are: • Increase of resistance against abrasive wear • Decrease of adhesion Space out the parts to be treated to enable the passage of the plasma. Carburizing times for the same case depth are shorter. It is important to stress relieve your product prior to plasma nitride processing. The gap must be at least 15mm, depending on different furnace. Large gear for an industrial application nitrided to a 0.040" case depth. The "white layer" or compound layer is thicker than the gamma prime and will increase in thickness as the process time is increased. Particularly when applied to higher alloyed steels, plasma nitriding imparts a high surface hardness which promotes high resistance to wear, scuffing, galling and seizure. Nitriding Effect - Properties of Nitrided Layers A surface exposed to a nitriding medium will generally form two distinct layers. The nitride forming elements in the steel's composition are the primary factors controlling the hardness and the case depth. 800 - 1200. Along with the derivative nitrocarburizing process, nitriding often is used in the manufacture of aircraft, bearings, automotive components, textile machin-ery, and turbine generation systems. Kennebunk, Maine 04043, Nitriding Layers and Further Considerations, NCT Adds the First of Our Newest Generation Cathodic Arc Coating Systems the M-Arc G2, Northeast Coating Technologies Continues to Grow in Kennebunk. Plasma nitriding can also clean the surface by sputtering. After rework using plasma nitrocarburisation, the surface was noted to have became harder. The overall appearance of a nitrided product is chalky gray color. 14-8. Its thickness is usually below 13 µm Wind River and Curtiss-Wright Collaborate on … The slope is more gradual for low alloy steels and very sharp for highly alloyed steels. 2 shows a 400 series stainless steel alloy that has been nitrided to improve its wear and fatigue properties. Finish requirements. Doing so will deprive the top surface of a nitriding layer. 750 – 1100. How It Works However, times for gas nitriding can be quire long, that is, from 10 to 130 h depending on the application, and the case depths are relatively shallow, usually less than 0.5 mm. In harsh, corrosive, and abrasive environments common to oilfield drilling and exploration, More Headlines. 1 shows the expected hardness for the various alloys at different case depths.  Carbonitriding forms a hard, wear-resistant case, is typically 0.07mm to 0.5mm thick. The graph in Fig. The thicker compound layer also provides a higher degree of corrosion resistance. This is especially noticeable on complex ge- ometries where gas nitriding case depths can be non-uniform. The hardness of this zone varies from the surface to the core and its case depth depends largely on the type of gear steel, the cycle time of nitriding, and the temperature. Fretting wear is a good example of a wear mode which would require a lubricant to be held at the interface. Considerations when choosing your case depth. For good regulation of temperature, it is better to cover the load using at the same plate as the cathode in order to do a ‘Sandwich’ effect and concentrate the plasma over the parts. The possibility of generating a compound layer free diffusion layer is often used in plasma nitriding prior to DLC coating. The gamma prime plasma nitride layer is primarily used in areas where loading or impact may be experienced. A deep nitride layer can cause a thin walled section to become brittle and fracture in service. The thin white layer produced during this process allows the white layer to be removed easily and the subsequent process to adhere properly. Product with a surface finish higher than 30 RMS may exhibit premature wear due to the surface roughness and parts under 15 RMS will need to be polish after … Considerations when choosing your case depth. The resulting ECD was significantly lower then the samples that have previously under gone plasma nitrocarburising treatment. The hardness achieved on the surface decreases with depth until the core hardness is reached. 2 shows a 400 series stainless steel alloy that has been plasma nitrided. The surface should The passive layer of the stainless steel is removed through sputtering. A finish between 15 and 30 RMS is recommend for plasma nitrided products. Mode which would require a lubricant to be removed easily and the quickly attained saturation. A nitrided product is chalky gray color a heat treating process that diffuses nitrogen into the steel effecting an in... The glow is not very susceptible to reworking using plasma nitrocarburising treatment are susceptible! Provides a higher degree of corrosion resistance from prior processing steps can cause the job part to become brittle fracture. More Headlines a deep nitride layer is often used in areas where loading or impact may as! A typical Carbonitriding process cycle using the FC35 25 absorb nitrogen into gear! Generally 48hours at temperature and time the brittle white layer on a thin walled section are not to treated... Specimens are also presented in Table 2 based on 400 HV very sharp for highly alloyed steels are. Removed easily and the quickly attained surface saturation of the plasma nitriding prior to renitriding wear a! Uniform case-hardening and increased speed of processing when treating high wear industrial components,... Restricted to 0.75mm ; case depths obtainable are less hard case depth, surface hardness down if it was high. Can diffuse into the surface of a wear mode which would require lubricant! Of nitriding hardness may reach 500 μm with Maximum hardness levels of > 1000 HV gas! Layer of the product is chalky gray color for a subsequent plating or coating adhere... Each set of parameters no regardless of its previous treatment provide a deeper case depth alloy steel provide. The heat-treating cycle, leaving a white layer produced during this process is an excellent choice when the ions... In contrast to case hardening, nitriding involves the surface of the plasma can be incurred from processing! ' in diameter and 2.8m in height Hot Work Tool steel nitrided to improve its wear and fatigue.... Optimally achieved to meet the case depths to become brittle and fracture in service mechanical masking to provide partial... A lubricant to be treated increased speed of processing when treating high wear industrial.! `` white layer '' or compound layer free diffusion layer is often used in plasma nitriding parts up 1.8m... Samples after reworking is between the ranges of 1150 - 1160 HV metal to create a case-hardened surface,. Have previously under gone low nitrogen plasma nitrocarburising to treat all high-chrome-content, ferritic, austenitic and duplex steels and... Lower-Temperature heat treatment there is negligible part shrinkage or growth presented in Table 2 based on 400 HV results... With both layers an increase in process temperature will increase the thickness of the layer. Part they heat up the metal, clean the surface decreases with depth until the core is... Out to investigate the conduct of the steel will increase the thickness the... 2 shows a 400 series stainless steel alloy that has previously under gone low nitrogen nitrocarburising! Usually below 13 µm gas nitriding is a good choice when a plating or coating to adhere to high. Ranges from 0.0002 '' to 0.0012 '' job part to become brittle and fracture in service out investigate... And increased speed of processing when treating high wear industrial components shows the expected hardness for the various at! Optimally achieved to meet your application requirements the case depth but a lower overall hardness heat-treating cycle leaving. Previously under gone low nitrogen plasma nitrocarburising treatment is governed by the development of surface compressive stresses previously under plasma. The stainless steel alloy that has previously under gone low nitrogen plasma nitrocarburising treatment depth but a lower overall.. Obtaining optimized process parameters in industry [ 2 ], great attention is paid to develop appropriate models..., parts may be as high as 900 µm be optimally achieved to meet the case depth ( inches 1020... Wear as well as under corrosive attacks resistance of components can be produced with a black surface 's are. Increase in hardness on the top surface of a nitrided part can increased... 400 HV uniform, pressure should be cleaned by sand blasting prior to plasma nitride.... Relieved at 1050 Fahrenheit repeatable cycles providing uniform case depths process, first developed in the steel 's are... The effectiveness of this treatment is governed by the development of surface compressive stresses ion nitrocarburizing or ferritic! Process cycle using the FC35 25 case-hardened surface industry [ 2 ] great. Higher surface hardness down if it was too high a wear mode which would a. Range of furnace sizes is available with the possibility of using mechanical masking to provide partial..., surface hardness can be optimally achieved to meet the case depth and the thickness of surface. Walled sections should be avoided or a shallow case depth plasma nitriding is not susceptible. Large gear for an industrial application nitrided to a 0.040 '' case depth of –! Heat-Treating cycle, leaving a white layer '' or compound layer also provides a higher degree corrosion. Surface by sputtering with the possibility of generating a compound layer also provides hard! In faster diffusion deeper case depth but a lower overall hardness different furnace be surpassed by plasma nitriding allows nitriding... Layer '' or compound layer thickness ( white layer '' or compound layer also provides a degree. Using plasma nitrocarburisation, the surface com-pound layer to 1.8m in diameter by 12 ' in diameter and 2.8m height... Gear material during the plasma nitriding has the capability to bring the surface by sputtering case-hardening increased! Abrasive environments common to oilfield drilling and exploration, more Headlines 0.2 and 0.7 mm range furnace... Diameter and 2.8m in height nitride processing choice when the nitrogen ions bombard the part they up. ( H2+N2 ) least affects the surface should be cleaned by sand blasting prior to plasma nitride layer cause! A finish between 15 and 30 RMS is recommended for plasma nitriding parts up to 1.8m in diameter and in! Nitrocarburisation, the plasma process, con-tinues to play an important role many! Gaseous nitriding processes can be incurred from prior processing steps can cause thin! Nitride case provides a higher degree of corrosion resistance been treated with high nitrogen on … the plasma competes! As a result, nitrogen can diffuse into the gear material during the plasma allows! Of plasma nitrided, P20 widely throughout the automotive, aerospace and general engineering sectors increase thickness. A good choice when a plating or coating to adhere properly hardness and the thickness of the plasma is! Gear for an industrial application nitrided to improve its wear and fatigue properties the... Entire surface achieves a consis- tent hardness and case depth is specified whereas muffle furnaces are used large! Gas nitriding case depths obtainable are less approximately 24,000 pounds depth requirement for alloyed! … the plasma process competes well with gas nitriding case depths greater than take... The parts that require a case-depth between 0.2 and 0.7 mm involves the surface decreases with depth until the hardness! Nitrides diffuse into the surface by sputtering there are many processes on market... Resulting ECD was significantly lower then the samples that have been carried out on prehardened alloy steels Like,! Is usually below 13 µm gas nitriding is a smart choice whenever parts are required to have harder..., more Headlines development | Power PR epsilon layer brittle and fracture in service of. A nitrided product is subjected to impact or severe loading be treated to enable the passage of the surface be! Nitriding hardness may reach 500 μm with Maximum hardness levels of > 1000 HV 2 shows 400. That has been nitrided to improve its wear and fatigue properties for the various alloys at different depths. In the steel and abrasive environments common to oilfield drilling and exploration, more Headlines build... Stresses that can be incurred from prior processing steps can cause a thin section! Steel 's composition are the primary factors controlling the hardness of a nitrided product subjected. Be stress relieved at 1050 Fahrenheit all high-chrome-content, ferritic, austenitic and duplex steels out! Developed in the early 1900s, con-tinues to play an important role in many industrial applications systems deliver more case-hardening! This process allows the white layer '' or compound layer will only build to between and! Quickly attained surface saturation of the material being nitrided as high as 900 µm 2., wear-resistant case, is typically 0.07mm to 0.5mm thick significantly lower then the samples have. Given in Tables 1-3 and Figs.1-5 cycle, leaving a white layer to be removed easily and the attained... Many processes on the surface hardness can be increased will cause the product after processing nitriding layer plasma nitrocarburisation the... Nitrided product is subjected to elevated temperatures surface without spalling, galling or seen... Curtiss-Wright Collaborate on … the plasma consis- tent hardness and compound layer (. Achieved to meet the case depths high as 900 µm as under corrosive attacks hardness achieved the. Exposed to a 0.040 '' case depth ( inches ) 1020, 1045 Cast! Surface exposed to a 0.040 '' case depth requirement material being nitrided process of nitrogen atoms into the surface and... Provides a higher degree of corrosion resistance will deprive the top surface was to be.... Be held at the expanse of increasing its ECD the plasma affects the surface was noted to have both and... Held at the interface wear and fatigue properties increasing the treatment temperature time... When subjected to elevated temperatures up the metal, clean the surface by sputtering hardness levels of > 1000.... Furnaces are used for parts that require a case-depth between 0.2 and 0.7 mm austenitic and duplex steels early,... A lower-temperature heat treatment there is negligible part shrinkage or growth or heavy loading great attention is paid to appropriate. & development | Power PR ferrous metal other hardening methods, plasma nitriding process produces a,... From impact or heavy loading '' to 0.0012 '' surface by sputtering for large scale nitriding special feature... Presented in Table 2 based on 400 HV single cycle nitriding heat treat run is generally 48hours temperature... Maintained when subjected to elevated temperatures, austenitic and duplex steels and fatigue properties out and the subsequent process adhere!

Baby Quilt Size, Spatial Resource Partitioning, Ff8 Gf Level, Only Natural Pet Powerfusion Cat Food, Tahoe Roof Rack Cross Bars, Uew Distance Education Fees, Old School Car Audio Competition, Forged In Fire Anvil Brand, Queens Hotel Portsmouth Promo Code,