Effect of Cryogenic Treatment on Residual Stress of D11 Powder Metallurgical Steel

Author of the article:LIU Jizhao 1 , ZHANG Like 1 , ZHANG Rong 1 , LI Defeng 2 , LIANG Bojiao 2

Author's Workplace：1. School of Mechanical Engineering, Hunan Institute of Technology, Hengyang 421008, China; 2. Hunan testing institute of product and commodity supervision, Changsha 410007, China

Key Words：cryogenic treatment; residual stress; D11 steel; carbide

Abstract：The effects of cryogenic treatment time on the microstructure and residual stress of D11 powder metallurgical
steel were studied. The results show that, compared with the conventional heat treatment, the residual stress and surface
roughness of the samples are reduced by cryogenic treatment, but the hardness value and the residual austenite content have
no significant changes before and after cryogenic treatment. The distribution of residual stress is related to the
microstructure of the samples. After cryogenic treatment for 24 h, the carbide precipitation is more uniform and the residual
stress is the minimum.