Properties of M2052 Mn-Cu alloy powder prepared by VIGA method and its SLM prints

doi:10.13251/j.issn.0254-6051.2020.10.028

Abstract

Abstract: The M2052 alloy powder was prepared by the vacuum induction melting gas atomization(VIGA) method, and its physical properties and microstructure were analyzed. Then the Mn-Cu specimens were prepared by selective laser melting (SLM) technology and the microstructure and mechanical properties of the SLM printed specimens were analyzed. The results show that, the VIGA method can effectively control the shape of metal powders, and the VIGA Mn-Cu powders with a particle size range of 15-53 μm have high yield, high bulk density, and good degree of sphericity, thus effectively meet the requirements for that of SLM. The microstructure of SLM printed Mn-Cu alloy is different in the horizontal and the vertical directions, and gradually changes into cellular crystals as the interior of the molten pool extends.Columnar crystals are formed along the welding interface, and the further away from the molten pool, the finer the columnar crystals. Compared with the as-cast, the SLM printed alloy has obvious difference in mechanical properties, with the tensile strength and the proof strength, plastic extension being 611 MPa and 504 MPa respectively, which are much higher than 454 MPa and 172 MPa of the as-cast master alloy. The reason is that the fine grain strengthening effect is obvious, but the existence of microcracks is not good for the plasticity.

Key words: vacuum induction melting gas atomization(VIGA), selective laser melting(SLM), metal powder, microstructure, mechanical properties

CLC Number:

TG145

Ma Conghui, Wang Changjun, Shen Tao, Hu Jiaqi, Liang Jianxiong. Properties of M2052 Mn-Cu alloy powder prepared by VIGA method and its SLM prints[J]. Heat Treatment of Metals, 2020, 45(10): 140-147.

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