热处理工艺对SLM成形汽车用Fe-35Mn铁基高锰合金组织与力学性能的影响

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Abstract The selective laser melting (SLM) was used to prepare Fe-35Mn Fe-based high Mn alloy for automobile. Three heat treatment processes, namely solid solution, aging, and solid solution-aging, were used to treat the alloy, and the microstructure and mechanical properties of the alloy were analyzed and tested. The results show that Fe-35Mn alloy prepared by SLM and treated by solid solution or solution-aging treatment can refine the grain and generate many twins. Compared with the alloy of solid solution treatment, larger size grains are formed after the solid solution aging treatment, and the twins size of solution aging alloy is larger than that of solution aging alloy. After different heat treatment, Fe-35Mn alloys all produce α-Mn phase. With the increase of tensile strain, the solution alloy has the earliest plastic deformation and the best plasticity. After aging treatment, the tensile strength and yield strength of high-Mn Fe-35Mn SLM alloy increase, but the impact toughness and elongation decrease. After solution aging treatment, the number of pores is the least, the impact toughness and elongation reach the maximum (22.8 kV/J and 21.6%, respectively), and the alloy has good plasticity. Both the morphology of SLM and the tensile fracture of heat-treated Fe-35mn alloy are dimple fracture. The solution aged alloy has the least number of pores and the best plasticity.

Key words： selective laser melting high manganese alloy heat treatment mechanical properties microstructure tensile twin dimple

Received: 27 May 2019 Published: 19 June 2020

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	LIU Lingge
	ZHU Jingjin
	TIAN Hailan

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LIU Lingge,ZHU Jingjin,TIAN Hailan. Effect of heat treatment process on microstructure and mechanical properties of SLM formed Fe-35Mn Fe based high manganese alloy for automobile[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(6): 498-502.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2019/V24/I6/498

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