Effect of Tempering Temperatures on Microstructure and Mechanical Properties of 300M Steel
Author of the article:WANG Bingxu;CUI Weiwei;ZHANG Yu;HU Zirui
Author's Workplace：Faculty of Mechanical Engineering and Automation,Zhejiang Sci-tech University,Hangzhou 310018,China
Key Words：300M steel tempering process microstructure mechanical properties
Abstract：The effects of different tempering temperatures on microstructure and mechanical properties of 300M steel were studied.The results show that the microstructure of 300M steel is composed of tempered martensite and retained austenite when tempered at 200-600℃.With the increase of tempering temperature,the lamellar morphology of tempered martensite gradually disappeared,the content of residual austenite decreased,and granular cementite or carbide precipitated.The hardness,yield strength and tensile strength of 300M steel decreased,and the elongation increased.
