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

doi:10.13251/j.issn.0254-6051.2022.11.006

Abstract

Abstract: 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.

Key words: laser additive manufacturing, Ferrium M54 secondary hardening steel, heat treatment, microstructure, mechanical properties

CLC Number:

TG161

Zhao Zhongchao, Ning Jing, Su Jie, Jiang Qingwei. Effect of heat treatment on microstructure and mechanical properties of laser additive manufactured Ferrium M54 steel[J]. Heat Treatment of Metals, 2022, 47(11): 39-44.

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