Research on Reducing Residual Austenite of Piston
Author of the article:ZHU Qingbao;Hong Jun
Author's Workplace：Anhui Haili Precision Casting Co., Ltd., Maanshan 243000, China
Key Words：quenching temperature residual austenite tempering hardness
Abstract：
Ni-Cr-Mo Alloy piston is one of the important components of compressor. Heat treatment is required to meet performance requirements. At present, the heat treatment process of H company is quenching, cryogenic treatment and tempering, the cryogenic treatment process can effectively reduce the residual austenite of casting. Taking a certain type of piston casting as the research object, 820 ℃ quenching and 200 ℃ one time tempering for 4 hrs, the cooling process is eliminated by adjusting the heat treatment process. The results show that the residual austenite content decreased to about 5% and reached the level of cryogenic treatment, and the hardness basically reach the requirements. It provides the direction for the following improvement and is of great significance to reduce the manufacturing cost.
