Quenching is not necessary when hardening is done by-
Nitriding
Many case hardening processes, such as carburizing and carbonitriding, involve diffusing carbon (and nitrogen) into the surface at high temperatures, followed by quenching and tempering to achieve a hard martensitic case. Therefore, nitriding does not require rapid quenching from a high temperature. Because nitriding hardness comes from nitride precipitates and not martensite, rapid quenching is not a necessary part of the nitriding process cycle.
Important Questions from Case Hardening
The aim of the tempering heat treatment is to reduce _____ while substantially reducing ______.
Which is a false statement about tempering? Tempering is done to
In order to gain toughness in hardened steel, the process usually adopted is:
The process where the carbon from outside is introduced in the surface of steel by keeping charcoal at higher temperatures is called ________.
The hardening of machine tool guideways is usually carried out by
