Effect of aging time on microstructure and mechanical properties of SLM 18Ni300 maraging steel

doi:10.13251/j.issn.0254-6051.2021.06.018

Abstract

Abstract: Effect of aging time on microstructure and properties of maraging steel formed by selective laser melting (SLM) after solid solution and aging at 500 ℃ for different time was analyzed. The results show that the microstructure of the SLM 18Ni300 steel is composed of martensite, retrograde austenite and Ni₃(Mo, Ti) precipitates after solution and aging treatment. With the increase of aging time, the precipitates gradually increase and grow up, the content of reverse austenite increases, and the hardness and strength gradually increase and then decrease after reaching the peak value, while the elongation increases continuously. The optimal aging process of the SLM 18Ni300 steel is 500 ℃×4 h.

Key words: maraging steel, selective laser melting, aging treatment, microstructure, mechanical properties

CLC Number:

TG142.24

Dong Fuyuan, Zhang Mingxu, Hou Junfeng. Effect of aging time on microstructure and mechanical properties of SLM 18Ni300 maraging steel[J]. Heat Treatment of Metals, 2021, 46(6): 88-91.

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