What is the process of nitriding?
Nitriding is a case-hardening process in which nitrogen is introduced into the surface of a ferrous alloy such as steel by holding the metal at a temperature below that at which the crystal structure begins to transform to austenite on heating as defined by the Iron-Carbon Phase Diagram.
What is the difference between nitriding and Nitrocarburizing?
Nitriding is used on ferrous, titanium, aluminum, and molybdenum alloys, and most commonly on low-carbon, low-alloy steels. Nitrocarburizing is only used on ferrous alloys. They improve surface properties of metal components and tools such as scuff and corrosion resistance, and increase the fatigue strength.
What is carburizing and nitriding?
Nitriding and carburizing are the two most common heat treatment practices for surface hardening functional components. The main difference is that in nitriding, nitrogen atoms are made to diffuse into the surface of the parts being processed, whereas in carburizing, carbon is used.
What heat treatment process the nitriding comes under?
Nitriding is a surface hardening process in which nitrogen atoms are diffused into the surface of ferrous materials at sub-critical temperatures and react with the base metal to form a hard, wear resistant, and fatigue resistant nitrided case below the surface.
What is the purpose of nitriding process?
The main objectives of nitriding are to increase the surface hardness of the material, as well as its wear resistance, fatigue life, and corrosion resistance [30], which are achieved by the presence of the nitrided layer.
How do you check nitriding case depth?
The effective case depth in gas nitriding is defined as that point on the curve where the hardness is equal to the core hardness plus 4 HRC points (50 HV). For example, when the core hardness equals 30 HRC (300 HV), the effective case depth is defined as that point where the hardness is 34 HRC (350 HV).
Which of the following is required for the nitriding process?
Nitriding requires special steels called ‘Nitralloy’. This is because hardness depends on the formation of very hard compounds of nitrogen and metal such as aluminum, chromium, and vanadium present in the steel. This is due to the formation of iron nitrides formed to a considerable depth below the surface of the steel.
What is the effective case depth?
The effective case depth is defined as the distance from the finished tooth surface to a specific subsurface hardness value. The effective case depth is measured normal to the finished gear surface up to a location where the hardness number is 50 HRC, measured by converting from microhardness test results.
What is the purpose of tempering?
Tempering reduces the hardness in the material and increases the toughness. Through tempering you can adapt materials properties (hardness/toughness ratio) to a specified application.
How is the nitriding process carried out in a vacuum?
The Ion Nitriding Process 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. When the nitrogen ions bombard the part they heat up the metal, clean the surface, and absorb nitrogen into the surface.
What does nitrex nitrocarburizing and nitriding do?
Nitrex Nitrocarburizing/Nitriding is a “green” technology which uses significantly less process gas. It enables us to provide high quality parts with greater uniformity at very competitive prices.
How is nitriding used to harden ferrous materials?
Nitriding is a surface hardening process in which nitrogen atoms are diffused into the surface of ferrous materials at sub-critical temperatures and react with the base metal to form a hard, wear resistant, and fatigue resistant nitrided case below the surface.
What makes nitriding a good choice for precision parts?
The combination of subcritical temperatures, minimal distortion, and protective atmospheres make nitriding a good choice for precision parts. Most ferrous materials can be nitrided in theory, but the process is most effective when applied to alloy steels containing nitride-forming elements such as Cr, Al, Mo, V, W, and Ti.