Heat treatment process for optimizing 42CrMo low-temperature impact absorbing energy

Abstract

The invention provides a heat treatment process for optimizing 42CrMo low-temperature impact absorbing energy. According to the heat treatment process, during forging discharging, chemical compositions are controlled, the B element is added, and the hardenability is improved; and after forging, different high normalizing temperatures, different high hardening temperatures and the faster cooling manner are adopted, and the better low temperature impact toughness is obtained. In the discharging process, the chemical compositions are added, the B element is added, then forging is performed, forged materials are subjected to high-temperature normalizing and high-temperature tempering, then rough machining is carried out, materials obtained after rough machining is subjected to modulation treatment, and modulation treatment specifically includes high-temperature quenching and high-temperature tempering, and stress relief annealing is carried out after semifinishing.

Description

technical field [0001] The invention relates to the technical field of material heat treatment, in particular to a heat treatment process for optimizing 42CrMo low-temperature impact energy absorption. Background technique [0002] The forging manufacturing industry is the basic industry of the national equipment manufacturing industry. It is also an indispensable strategic industry related to national security and the lifeline of the national economy. It is also an important component of national capabilities. The development level of large forgings is a measure of a country's comprehensive capabilities important sign. [0003] With the rapid development of my country's shipbuilding, electric power, petroleum, chemical and other industries, the development of my country's free forging industry has been accelerated to a large extent. However, the product size is getting larger and the technical requirements are getting higher and higher. It not only promotes It has not only ...

AI Technical Summary

Problems solved by technology

[0007] As the service temperature decreases, the forging used will change from a tough state to a brittle state; especially as the cross-sectional size of the workpiece increases, due to the size effect and mass effect, the cooling effect during heat treatment and quenching is getting worse and worse, and the obtained microstructure It will become worse and worse, the fracture section of the material will gradually change from a plastic state to a brittle state, and the impact absorption energy will be difficult to meet the technical requirements, and the material will become more and more unsafe.

Therefore, it is necessary to study the heat treatment process of 42CrMo to achieve the purpose of process optimization, so as to solve the problem of unqualified low-temperature impact absorption energy of 42CrMo and meet the technical requirements of customers