Co-enhancing the Mechanical Property and Corrosion Resistance of Selective Laser Melted High-Strength Stainless Steel vi
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JMEPEG https://doi.org/10.1007/s11665-020-05237-3
Co-enhancing the Mechanical Property and Corrosion Resistance of Selective Laser Melted High-Strength Stainless Steel via Cryogenic Treatment Li Wang, Chaofang Dong, Yu Cao, Jianxiong Liang, Kui Xiao, and Xiaogang Li Submitted: 17 March 2020 / Revised: 19 August 2020 / Accepted: 24 September 2020 The mechanical properties and corrosion resistance of selective laser melted high-strength martensitic stainless steel were enhanced by cryogenic treatment. The microstructure of the martensitic stainless steel contained fine martensite lath due to fast cooling rate. Simultaneously, there were bulk austenite formed at the boundary of molten pool and thin austenite film distributed at martensite laths. After cryogenic treatment, the content of austenite decreased from 25 to 19.2%, and Cu-rich precipitates were refined to 1-3 nm during subsequently aging due to decreasing of lattice constant, which were benefit for the hardness and tensile strength of the selective laser melted 15-5PH martensitic stainless steel without negatively influencing on the plasticity. Simultaneously, the electrochemical tests showed that the pitting potential and passivation film stability gradually increased after cryogenic treatment. Finally, the effect of cryogenic treatment on microstructure for selective laser melted high-strength martensitic stainless steel was discussed. Keywords
corrosion behavior, cryogenic treatment, martensitic stainless steel, mechanical property, selective laser melted
1. Introduction High-strength martensitic stainless steel is widely used in landing gear of aircraft and bearings of marine industry due to its high strength, elongation and good corrosion resistance (Ref 1, 2). With the development of aerospace applications and complication of structures parts, it is necessary to produce the high-precision complex parts by additive manufacturing and study the correlation between the manufacturing process and properties of high-strength steel. Selective laser melted (SLM) as a common additive manufacturing technique has been widely used to produce complex high-strength stainless steel structural parts for aerospace applications (Ref 3-6). SLM martensitic stainless steel has been studied regarding its initial mechanical behavior and microstructure. Related researches showed that a fast cooling rate (106 K/s) and multi-pass heat treatment occurred during multitrack multilayer selective laser melted process (Ref 7). Thus, the SLM high-strength martensitic steel contained finer martensite laths and higher content of retained austenite. The mechanical behavior of SLM martensitic steel was comparable to that of traditional manufac-
Li Wang, Chaofang Dong, Yu Cao, Kui Xiao, and Xiaogang Li, Beijing Advanced Innovation Center for Materials Genome Engineering, Key Laboratory for Corrosion and Protection (MOE), Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China; and Jianxiong Liang, Institute for Special Steel, Central
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