正火温度对G18CrMo2-6铸钢微观组织及力学性能的影响  

Effect of normalizing temperature on microstructure and mechanical properties of G18CrMo2⁃6 cast steel

作　　者：陈玉波 王培杰 原海瑞 李振江 Chen Yubo;Wang Peijie;Yuan Hairui;Li Zhenjiang(Shanxi Key Laboratory of Metal Forming Theory and Technology,Taiyuan University of Science and Technology,Taiyuan Shanxi 030024,China)

机构地区：[1]太原科技大学金属材料成形理论与技术山西省重点实验室,山西太原030024

出　　处：《金属热处理》2024年第1期137-141,共5页Heat Treatment of Metals

基　　金：山西省基础研究计划(202203021211207);山西省科技创新人才团队专项(202204051001002)。

摘　　要：研究了正火温度(850~1000℃)对G18CrMo2-6铸钢微观组织和力学性能的影响。结果表明,尽管正火温度不同,G18CrMo2-6钢的微观组织均为贝氏体铁素体(BF)和马氏体-奥氏体(M-A)岛组成的粒状贝氏体。随着正火温度的升高,粒状贝氏体中M-A岛的数量和尺寸先减小后增加,从而导致冲击吸收能量呈先上升后下降的趋势。当正火温度低于940℃时,随着正火温度的升高,M-A岛数量减少,C、Cr等元素扩散到BF中,使屈服强度升高。正火温度为940℃时,G18CrMo2-6钢的抗拉强度和冲击吸收能量最高,分别为942 MPa和28 J。正火温度进一步提高时,BF中位错减少,晶粒粗大,导致屈服强度下降。Effect of normalizing temperature(850⁃1000℃)on microstructure and mechanical properties of G18CrMo2⁃6 steel was studied.The results show that the microstructure is granular bainite composed of bainite ferrite(BF)and M⁃A island after normalizing at different temperatures.With the increase of normalizing temperature,the quantity and size of M⁃A islands decreases first and then increases,so that impact absorbed energy of the steel increases first and then decreases.When the normalizing temperature below 940℃,with the increase of normalizing temperature,the quantity of M⁃A islands decreases,C,Cr and other elements spread into BF,leading to increase yield strength.When the normalizing temperature is 940℃,the tensile strength and impact absorbed energy of the steel are the highest,which are 942 MPa and 28 J,respectively.When the normalizing temperature is further increased,the dislocations in BF are reduced and the grains are coarsened,resulting in a decrease in yield strength.

关 键 词：G18CrMo2-6钢 正火温度 粒状贝氏体 M-A岛 

分 类 号：TG142.1[一般工业技术—材料科学与工程]