高铁车轮钢中贝氏体组织与力学性能的研究  

Study on Bainite Microstructure and Mechanical Properties of High-speed Wheel Steel

作　　者：李迁 赵爱民 裴伟 郭军 娄殿川 LI Qian;ZHAO Aimin;PEI Wei;GUO Jun;LOU Dianchuan(Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学钢铁共性技术协同创新中心,北京100083

出　　处：《热加工工艺》2021年第18期65-68,共4页Hot Working Technology

摘　　要：利用激光共聚焦显微镜(LSCM)和电子背散射衍射(EBSD)以及拉伸、纳米压痕等实验对进口ER8高铁车轮钢的轮辋踏面的微观组织与力学性能进行研究。结果表明,高铁车轮钢存在的微观组织有先共析铁素体、珠光体、上贝氏体。含有上贝氏体的高铁车轮钢的错位角一般存在两个高数量分数区域,而未含有上贝氏体的高铁车轮钢在高角度时不存在高数量分数区域。在室温拉伸过程时,上贝氏体会降低抗拉强度,可能会降低车轮运行的抵抗能力,而两组的伸长率和断面收缩率相当。拉伸断口呈现为典型的杯锥状且以解理断裂存在。上贝氏体的纳米硬度高于珠光体的。The microstructure and mechanical properties of rim tread of imported ER8 high-speed wheel steel were studied by laser confocal(LSCM),electron backscattering diffraction(EBSD),tensile and nano indentation experiments.The results show that the microstructure of wheel steel includes proeutectoid ferrite,pearlite and upper bainite.There are generally two high quality fraction areas in the misorientation angle of wheel steel with upper bainite,but there is no high quality fraction in wheel steel without upper bainite at high angle.In the process of drawing at room temperature,the upper bainite reduces the tensile strength,which may reduce the resistance of wheel running,and the elongation and reduction of the section of the two groups are equal.The tensile fracture appears as a typical cup-cone-shaped in cleavage fracture.The nanometer hardness of upper bainite is higher than that of pearlite.

关 键 词：高铁车轮钢 上贝氏体 成分 强度 韧性 

分 类 号：TG142.1[一般工业技术—材料科学与工程]