Carburizing and quenching process

Abstract

The invention relates to a carburizing and quenching process, which belongs to the technical field of heat treatment of metal. The carburizing and quenching process comprises the steps of carburizing for the first time, carburizing for the second time, quenching for the first time, quenching for the second time, tempering at high temperature and tempering at low temperature. According to the carburizing and quenching process designed by the invention, two-time carburization is adopted during carburization, and the carburizing time of each time is shortened, so that the defects that metal hardness is low due to long-time heating and the anti-fatigue performance and the wear resistant performance are reduced can be effectively prevented, and the service life of a workpiece is greatly prolonged; in addition, two-time quenching is adopted, so that residual stress of the workpiece can be preferably released, and the service life is prolonged.

Description

technical field

[0001] The invention relates to a carburizing and quenching process, which belongs to the technical field of metal heat treatment. Background technique

[0002] Carburizing and quenching is a common heat treatment process for metal materials. It can make the surface of the carburized workpiece obtain high hardness and improve its wear resistance. Traditional processes mainly include: low temperature tempering, pre-cooling direct quenching, primary heating quenching, carburizing high temperature tempering, secondary quenching cold treatment, induction heating after carburizing and other processes. Quenching process is widely used in modern machinery manufacturing industry. The important parts in machinery, especially the steel parts used in automobiles, airplanes and rockets, are almost all quenched. In order to meet the technical requirements of various parts, various quenching processes have been developed.

[0003] Carburizing is the process of infiltrat...