Technology for optimizing 09 MnNiD low-temperature impact energy

Abstract

The invention provides a technology for optimizing a 09 MnNiD low-temperature impact energy. By means of the technology, it is ensured that the strength is best matched with ductility and toughness ofa 09 MnNiD material, and the requirement for low-temperature impact absorbing energy of a large forge piece is met. A conventional austenitizing temperature is used for conducting normalizing treatment on the 09 MnNiD forge piece, first-time high-temperature tempering is conducted, and therefore the tissue is adjusted, and grains are refined; afterwards, rough machining is conducted on the forgepiece, then the material obtained through rough machining is subjected to high-temperature quenching under the quenching temperature ranging from 920 DEG C to 950 DEG C, a deep hardening layer is obtained, and a fast cooling manner is adopted for cooling so as to reduce precipitation of brittle phases; afterwards, second-time high-temperature tempering is conducted, and the tissue is homogenized;and finally, the quenching temperature ranging from 850 DEG C to 885 DEG C is adopted for conducting subcritical quenching, tempering is conducted finally, and the corresponding 09 MnNiD material capable of being used for finish machining is obtained.

Description

technical field [0001] The invention relates to the technical field of material processing, in particular to a process for optimizing low-temperature impact energy of 09MnNiD. Background technique [0002] The forging manufacturing industry is the basic industry of the equipment manufacturing industry. 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 bigger and bigger. The technical requirements are getting higher and higher, which not only promotes the continuous upgrading of forging equipment, but also accelerates the birth of many new technologies and new processes in the forging industry. [0003] At present, there is still a certain gap between my country and the developed countries in the technical level of large forgings. It is not only the equipment capacity that cannot meet...

AI Technical Summary

Problems solved by technology

[0008] As the service temperature decreases, the forgings 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 resulting structure is It will become worse and worse, the fracture section of the material will gradually change from a plastic state to a brittle state, and it will be difficult to meet the technical requirements for low-temperature impact absorption energy, and the parts will become more and more unsafe