Effect of heat treatment on microstructure and mechanical properties of 15-5PH stainless steel by selective laser melting

doi:10.13251/j.issn.0254-6051.2023.11.020

Abstract

Abstract: 15-5PH stainless steel specimens were prepared by selective laser melting (SLM) forming process and then were aged at 620 ℃ for 4 h, and solution treated at 1030 ℃ for 1 h plus aged at 550 ℃ for 4 h, respectively. The microstructure and mechanical properties of the 15-5PH stainless steel specimens formed by SLM under different states were compared. The results show that compared to SLMed specimen, when the tensile strength of the specimens obtained by different heat treatments is equivalent, the microstructure of the aged specimen is mainly composed of fine dendritic grains which is mix structure of martensite, lamellar pearlite and ferrite, while the microstructure of the solution treated+aged specimen is mainly composed of tempered martensite+acicular ferrite+partial reversed austenite. The dendritic structure inside the grains almost disappears and the grains grow. Compared with the aged specimen, the yield strength and yield ratio of the solution treated+aged specimens are increased by 33% and 32%, respectively, and the impact absorbed energy, elongation after fracture, and the percentage reduction of area are decreased by 72.0%, 35.5% and 18.7%, respectively.

Key words: selective laser melting, heat treatment, 15-5PH stainless steel, microstructure, mechanical properties

CLC Number:

Wang Luyang, Sun Donghui, Huang Rui, Huang Hongwu. Effect of heat treatment on microstructure and mechanical properties of 15-5PH stainless steel by selective laser melting[J]. Heat Treatment of Metals, 2023, 48(11): 132-136.

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