淬火温度对新型齿轮钢组织及力学性能的影响  

Effect of quenching temperature on microstructure and mechanical properties of new gear steel

作　　者：戴建科 韩顺[1] 厉勇[1] 刘雨[1] 雷斯敏 王春旭[1] Dai Jianke;Han Shun;Li Yong;Liu Yu;Lei Simin;Wang Chunxu(Research Institute of Special Steels,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China)

机构地区：[1]钢铁研究总院有限公司特殊钢研究院,北京100081

出　　处：《金属热处理》2023年第1期163-168,共6页Heat Treatment of Metals

摘　　要：通过SEM、TEM和XRD分析,结合拉伸试验、断裂韧度试验和硬度测试,研究了淬火温度对新型齿轮钢组织及力学性能的影响。结果表明,经850~1050℃淬火+深冷+回火,试验钢的抗拉强度、屈服强度和洛氏硬度均随着淬火温度的升高先升高后逐渐降低,在900℃时分别达到峰值,此时抗拉强度为1483 MPa,断裂韧度则在淬火温度为1000℃时达到最高,为62.4 MPa·m^(1/2)。淬火温度低于1000℃时,试验钢的晶界及马氏体板条上存在富Mo型M6C碳化物,碳化物随淬火温度的升高逐渐溶解,在1000℃时未再观察到未溶相。试验钢的原始奥氏体晶粒尺寸随淬火温度的升高先缓慢增大,当温度超过1000℃时,原始奥氏体晶粒及组织快速粗化,断裂韧度和断面收缩率也出现大幅度降低。Effect of quenching temperature on microstructure and mechanical properties of new gear steel were studied by means of scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray diffraction(XRD)combined with tensile test,fracture toughness test and hardness test.The results show that after quenching at 850-1050℃,cryogenic treatment and tempering,the tensile strength,yield strength and hardness of the steel increase first and then decrease with the quenching temperature increasing,all reaching the maximum values at 900℃and the tensile strength is 1483 MPa.Moreover,the fracture toughness reaches the maximum value 62.4 MPa·m^(1/2)when the quenching temperature is 1000℃.The spherical Mo-rich M6C carbides precipitate on grain boundary and martensite when the quenching temperature is below 1000℃.The M6C carbides dissolve gradually with the quenching temperature increasing,and dissolve completely into the substrate at 1000℃.The prior austenite grain size grows slowly with the increase of quenching temperature,when the quenching temperature is above 1000℃,the austenite grain coarsens rapidly,the fracture toughness and percentage reduction of area also substantially decrease.

关 键 词：齿轮钢 淬火温度 力学性能 显微组织 未溶相 

分 类 号：TG142.1[一般工业技术—材料科学与工程]