Mixed crystal of austenite grain size in track pins 1E1158M steel
WANG Huan1, HU Jia-li1, ZHANG Chao-lei1, LI Jian2, MIAO Hong-sheng3
1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. School of Mechanical Engineering, Qinghai University, Xining 810016, Qinghai, China; 3. Qinghai Special Steel Engineering Technology Research Center, Xining Special Steel Co., Ltd., Xining 810005, Qinghai, China
Abstract：The mixed crystal of austenite grain size in track pins 1E1158M steel was investigated at different finishing temperatures,then the grain size and it's microstructure were adopted to study the effect of different finishing temperatures by thermal simulation test,quantitative analysis of microstructure and intercept method. The results show that the abnormal grain growth temperature of hot-rolled and normal-fired microstructures is both 850 ℃,and the finishing rolling temperature has an effect on mixed crystal degree. When the finish rolling temperature is 850 ℃,the austenite grains are partially recrystallized at the end of rolling,and the degree of mixed crystals is serious. As the finishing temperature increases,the inhomogeneity of the intrinsic grain size decreases and the recommended finishing temperature is 1 000 ℃.
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2020, Vol. 55 
