How the plasma carburizing and nitriding are beneficial over the conventional carburizing and nitriding processes?
Plasma carburising and plasma nitriding are thermochemical processes for increasing the surface hardness of low carbon steels. Compared with conventional carburising, they offer excellent control and repeatability, low energy consumption and fast heat treatment times.
What is the purpose of nitriding?
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 , which are achieved by the presence of the nitrided layer.
What is Nitro carburizing heat treatment?
Nitriding (N) and nitrocarburizing (NC) are thermochemical treatments that diffuse nitrogen and carbon into the surface of metals. Nitriding is used on ferrous, titanium, aluminum, and molybdenum alloys, and most commonly on low-carbon, low-alloy steels.
How is carburizing done?
Carburising, carburizing (chiefly American English), or carburisation is a heat treatment process in which iron or steel absorbs carbon while the metal is heated in the presence of a carbon-bearing material, such as charcoal or carbon monoxide.
What is the purpose of carburizing?
Carburising is a thermochemical process in which carbon is diffused into the surface of low carbon steels to increase the carbon content to sufficient levels so that the surface will respond to heat treatment and produce a hard, wear-resistant layer.
What is the difference between nitriding and carburizing?
Higher temperatures increase the carbon diffusion rates and thus the hardening is increased. Here, the steel is submerged in a liquefied carbon environment. Carbon diffusion is more efficient in this method. Nitriding is a heat-treating process that diffuses nitrogen into the surface of a metal to create a hardened surface.
What kind of process is nitrocarburizing in steel?
Nitrocarburization is a thermochemical diffusion process. Nitrogen, carbon, and a very small number of oxygen atoms diffuse onto the surface of steel or other ferrous alloys. This forms a surface compound layer and a diffusion layer. There are two types of nitrocarburizing.
Which is a modification of the nitriding process?
Nitrocarburizing is a modification of the nitriding process, not a form of carburizing. This modification consists of the simultaneous introduction of nitrogen and carbon into the steel in its ferritic condition; that is, below the temperature at which austenite begins to form during heating (Fig. 2).
What should temperature be for nitriding and nitrocarburizing?
Nitriding is typically carried out at 450 to 520°C and nitrocarburizing at 540 to 580°C. These treatments are below the tempering or stress-relieving temperatures of steel, which are over 600°C.