Evolution of microstructures and mechanical properties with tempering temperature of a pearlitic quenched and tempered steel  

作　　者：De-zhen Yang Zhi-ping Xiong Chao Zhang Guan-zheng Feng Zhifang Cheng Xing-wang Cheng 

机构地区：[1]School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China [2]National Key Laboratory of Science and Technology on Materials under Shock and Impact,Beijing 100081,China

出　　处：《Journal of Iron and Steel Research International》2022年第9期1393-1403,共11页

基　　金：support from the National Natural Science Foundation of China(5190102i);the"Beijing Institute of Technology Research Fund Program for Young Scholars".

摘　　要：Instead of conventional quenching and tempering,fast austenitization from an initial microstructure of lamellar pearlite followed by quenching and tempering was carried out,leading to the formation of inhomogeneous microstructure.It comprised different morphologies of lath martensite and retained austenite(RA).The effect of tempering temperature on microstructure evolution and tensile properties was systematically investigated.With increasing tempering temperature from 150 to 250℃,transition carbides gradually coarsened and their amount increased,the dislocation density in martensitic laths gradually decreased,and RA fraction decreased from 10.9%to 2.2%.The precipitation and dislocation strengthening can ensure a high strength,while RA can ensure a good ductility,leading to a simultaneous increase in the strength and ductility when decreasing tempering temperature.Specifically,the best combination of tensile properties(ultimate tensile strength of 2133±41 MPa and total elongation of 11.1%±1.3%)was achieved after tempering at 150℃.

关 键 词：Fast austenitization PEARLITE TEMPERING MANGANESE Mechanical property 

分 类 号：TG142[一般工业技术—材料科学与工程]