热处理对激光增材制造Ferrium M54钢微观组织及力学性能的影响  

Effect of heat treatment on microstructure and mechanical properties of laser additive manufactured Ferrium M54 steel

作　　者：赵忠超 宁静[2] 苏杰[2] 姜庆伟[1] Zhao Zhongchao;Ning Jing;Su Jie;Jiang Qingwei(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093,China;Institute for Special Steels,Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]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》2022年第11期39-44,共6页Heat Treatment of Metals

摘　　要：采用激光增材制造技术制备了Ferrium M54钢,研究了传统热处理对其组织和力学性能的影响。利用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射仪(XRD)、拉伸试验机及维氏硬度计分析了沉积态和热处理后试验钢的微观组织和力学性能。结果表明,激光增材制造M54二次硬化钢是由沿沉积方向生长的柱状晶构成,沉积态试样纵向的抗拉强度和屈服强度分别为1832 MPa和997 MPa,断后伸长率和断面收缩率分别为9.5%和28%;经过传统热处理后,定向凝固形成的胞状结构消失,得到马氏体组织。经1075℃固溶+1060℃油淬+-73℃深冷+510℃时效处理后激光增材制造Ferrium M54钢的性能最好,抗拉强度为1863 MPa,屈服强度为1594 MPa,断后伸长率为15%,断面收缩率为59%,硬度为603 HV。Ferrium M54 steel was prepared by laser additive manufacturing(LAM),and the effect of traditional heat treatment on its microstructure and mechanical properties was studied.The microstructure and mechanical properties of the tested steel deposited and heat treated were analyzed by means of optical microscope(OM),scanning electron microscope(SEM),X-ray diffractometer(XRD),tensile testing machine and Vickers hardness tester.The results show that the laser additive manufactured M54 secondary hardening steel is composed of columnar crystals growing along the deposition direction.The longitudinal tensile strength and yield strength of the deposited specimen are 1832 MPa and 997 MPa,respectively,and the elongation after fracture and the percentage reduction of area is 9.5% and 28%,respectively.After the traditional heat treatment,the cellular structure formed by directional solidification disappears and the martensite structure is obtained.After solution treatment at 1075℃+oil quenching at 1060℃+cryogenic treatment at -73℃+aging at 510℃,the LAM Ferrium M54 steel has the best properties,with tensile strength of 1863 MPa,yield strength of 1594 MPa,elongation after fracture of 15%,percentage reduction of area of 59% and hardness of 603 HV.

关 键 词：激光增材制造 Ferrium M54二次硬化钢 热处理 显微组织 力学性能 

分 类 号：TG161[金属学及工艺—热处理]