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

doi:10.13251/j.issn.0254-6051.2023.02.022

Abstract

Abstract: Effect of aging temperature (390, 490, 590 ℃) on microstructure and mechanical properties of selective laser melting (SLM) 18Ni300 maraging steel was investigated by means of tensile test, hardness test and microstructure characterization. The results show that the microstructure of the as-printed SLM 18Ni300 steel specimen is composed mainly of Fe-Ni martensite matrix and cellular substructure, which changes significantly after aging treatment. With the increase of aging temperature, the cellular substructure gradually decomposes, the martensite transforms into reversed austenite, and the fraction of Σ3 grain boundaries decreases. Meanwhile, dispersed nano-sized Ni₃X precipitates are formed and coarsen at 590 ℃. With the increase of aging temperature, the strength and hardness of the SLM 18Ni300 maraging steel increase first and then decrease, while the elongation decreases first and then increases. When aged at 490 ℃, the steel has both high strength and good plasticity, which is attributed to the dispersed nano-sized precipitates in the matrix, moderate content of austenite and low fraction of Σ3 grain boundaries.

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

CLC Number:

TG161

Xu Dayang, Chen Wanqi, Wan Jifang, Huang Feng, Zhang Shiqi. Effect of aging temperature on microstructure and mechanical properties of SLM 18Ni300 maraging steel[J]. Heat Treatment of Metals, 2023, 48(2): 144-149.

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