plasma nitriding case depth

These can be increased considerably through plasma nitriding. After rework using plasma nitrocarburisation, the surface was noted to have became harder. The excess nitrides diffuse into the gear material during the heat-treating cycle, leaving a white layer on the top surface. This process is sometimes referred to as ion nitrocarburizing or plasma ferritic nitrocarburizing (FNC). 14-8. Pit furnaces are commonly used for large scale nitriding, whereas muffle furnaces are used for small scale nitriding. 350 - 500. The overall appearance of a nitrided product is chalky gray color. Considerations when choosing your case depth. 1 shows the expected hardness for the various alloys at different case depths. It is evident that the effective case depth is increased by increasing the treatment temperature and time. EN41, 905M39, Nitralloy. These processes are most commonly used on high-carbon, low-alloy steels. 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. The components to … Plasma nitriding, on the other hand, offers a greater control on the thickness of the compound layer, which means greater control on growth. The conclusions drawn from the above experiment are as follow: Understand the parts to be treated and define the place not to be nitrided. A single cycle nitriding heat treat run is generally 48hours at temperature and results in a case depth of 0.015 – 0.020″. 0.100 – 1.00. 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. There are fundamental differences between the two processes. Nitriding may be done in electric-heating furnaces. Nitriding Effect - Properties of Nitrided Layers A surface exposed to a nitriding medium will generally form two distinct layers. Wind River and Curtiss-Wright Collaborate on … Plasma nitriding allows faster nitriding times, and the quickly attained surface saturation of the plasma process results in faster diffusion. Understand how to protect the parts that are not to be treated. Workpieces made of ferrous materials exhibit better wear, strength and corrosion properties after nitriding.  Its carried out in a salt bath or in a furnace gas atmosphere. 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 effectiveness of this treatment is governed by the diffusion process of nitrogen atoms into the steel. The graph in Fig. The case depth may be as high as 900 µm. 0.002-0.010. Plasma nitriding allows faster nitriding times, and the quickly attained surface saturation of the plasma process results in faster diffusion. Due to the high level of compressive stress within the nitrided case, the fatigue resistance of components can be increased. A special technical feature of this process is the possibility of using mechanical masking to provide accurate partial nitriding. Even higher surface hardness can be developed than by carburising, although the case depths obtainable are less. Thin walled sections should be avoided or a shallow case depth specified. Underneath the … There are many processes on the market that have been given specific trade names. The hardness of a nitrided part is maintained when subjected to elevated temperatures. 750 – 1000. EN3A, 070M20, 080M40, Mild Steels. This is especially noticeable on complex ge- ometries where gas nitriding case depths can be non-uniform. Carburizing times for the same case depth are shorter. The nitrided part can be renitrided to meet the case depth requirement. 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 graph in Fig. 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. The plasma process competes well with gas nitriding, carburizing and salt bath processes. EN40, 722M24, 31CrMoV9. The hardness achieved on the surface decreases with depth until the core hardness is reached. 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. Plasma nitriding (H2+N2) least affects the surface finish of the product. If the process produces a hard case depth, the plasma process can compete with it. 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. A deep nitride layer on a thin walled section will cause the job part to become brittle and fracture in service. 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. Gas nitriding is normally used for parts that require a case-depth between 0.2 and 0.7 mm. 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. 14-8. The nitride case provides a hard, wear resistant surface without spalling, galling or brittleness seen in conventional nitriding. 0.025 – 0.70. 550 – 850. Total Case Depth (inches) 1020, 1045, Cast Iron. The nitride forming elements in the steel's composition are the primary factors controlling the hardness and the case depth. Space out the parts to be treated to enable the passage of the plasma. 12/11/20, 12:21 PM | Processing & Handling, Design & Development | Power PR. In another words, a specific surface hardness would be achieved for each set of parameters no regardless of its previous treatment. 1 shows the expected hardness for the various alloys at different case depths. 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. Sample that has previously under gone plasma nitriding is not very susceptible to reworking using plasma nitrocarburising. The micrograph in Fig. Case Depth mm. Plasma nitriding can also clean the surface by sputtering. EN19, 708M40, 4140, 4340, P20. 8620, 9310, 9315, P6. Reworking has the capability to bring the surface hardness down if it was too high. 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. Also laboratory tests have been carried out to investigate the conduct of the material under adhesive wear as well as under corrosive attacks. This layer is also a good choice when a plating or surface coating will be applied to the product after processing. The advantages of gaseous nitriding processes can be surpassed by plasma nitriding. 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. However, this is at the expanse of increasing its ECD. Since plasma nitriding is a lower-temperature heat treatment there is negligible part shrinkage or growth. Nitriding case depth, surface hardness and compound layer thickness (white layer) can be optimally achieved to meet your application requirements. File Hard 0.0005". Case hardened surfaces are measured from the surface down to a hardness of (regularly) 50 HRc, so far correct (for Case hardening CDH) Nitriding depth is calculated from the opposite side. Finish requirements. Their ECD is notably higher then the samples that have prior been treated with high nitrogen. In order for a subsequent plating or coating to adhere to the substrate the white layer must be removed. The thicker compound layer also provides a higher degree of corrosion resistance. If the glow is not uniform, pressure should be increase. Large gear for an industrial application nitrided to a 0.040" case depth. Total Case Depth (inches) 1020, 1045, Cast Iron. 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 … 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. Gear measures 12' in diameter by 12' tall and weighs approximately 24,000 pounds. Nitriding THE NITRIDING PROCESS, first developed in the early 1900s, con-tinues to play an important role in many industrial applications. 14-8. Like case hardening, nitriding is one of the thermochemical diffusion treatment processes. The surface should be cleaned by sand blasting prior to renitriding. Of components can be increased is between the ranges of 1150 - 1160 HV words, a specific surface for. Shows a 400 series stainless steel alloy that has been nitrided to a ''... 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