Mechanical properties and wear resistance of ultrafine bainitic steel under low austempering temperature  

作　　者：Wei Liu You-hui Jiang Hui Guo Yue Zhang Ai-min Zhao Yao Huang 

机构地区：[1]Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China [2]School of Mechanical Engineering,Weifang University of Science and Technology,Shouguang 262700,China [3]China Electric Power Research Institute,Beijing 100192,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2020年第4期483-493,共11页矿物冶金与材料学报（英文版）

基　　金：the National Key Research and Development Plan of China(No.2016YFB0300205);the National Natural Science Foundation of China(Nos.U1810207 and 51601174).

摘　　要：The mechanical properties and wear resistance of the ultrafine bainitic steel austempered at various temperatures were investigated.Scanning electron microscopy(SEM)and X-ray diffraction were used to analyze the microstructure.The worn surfaces were observed via laser scanning confocal microscopy and SEM.Results indicated that,under low austempering temperatures,the mechanical properties differed,and the wear resistance remained basically unchanged.The tensile strength of the samples was above 1800 MPa,but only one sample austempered at 230°C had an elongation of more than 10%.The weight loss of samples was approximately linear with the cycles of wear and nonlinear with the loads.The samples showed little difference in wear resistance at different isothermal temperatures,whereas the thickness of their deformed layers varied greatly.The results are related to the initial hardness of the sample and the stability of the retained austenite.Meanwhile,the experimental results showed that the effect of austempering temperature on the wear resistance of ultrafine bainitic steel can be neglected under low applied loads and low austempering temperature.

关 键 词：bainitic steel mechanical properties WEAR RESISTANCE AUSTEMPERING temperature 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG156.5[金属学及工艺—金属材料]