Thermal Simulation of Ultra-rapid Cooling Process of Bearing Steel
Author of the article:CHEN Shengnan;WANG Haoxu;LI Zhuang;SUN Yankun;ZHANG Runqi;CAI Yiqin;CHEN Zhaoxia;YU Tao;LI Zhaohua
Author's Workplace：College of Materials Science and Engineering,Shenyang Aerospace University,Shenyang 110136,China;College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China
Key Words：GCr15 bearing steel ultra-rapid cooling isothermal secondary carbide
Abstract：Serious problems existed in the delivery state of bearing steel bar after deformation,such as rapid precipitation of high temperature reticulated secondary carbides,excessive reticulated grade and hardness.The thermal simulation experiment of ultra-rapid cooling of GCr15 bearing steel bar after high temperature deformation was carried out by thermal simulation machine,and its microstructure and hardness were studied.The results show that the pearlite content increase with the extension of isothermal time after rapid cooling to 700℃after deformation of 40%at high temperature.Secondary carbides are more obviously precipitated at grain boundaries.At 700℃isothermal,ultra-rapid precipitation and cooling,the amount of rapid precipitation of reticulated secondary carbides is reduced,and fine lamellar pearlite is obtained.
