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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Densification behavior, microstructure evolution, and mechanical performances of selective laser melted Ti-5Al-2.5Sn alpha titanium alloy: Effect of laser energy input
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Densification behavior, microstructure evolution, and mechanical performances of selective laser melted Ti-5Al-2.5Sn alpha titanium alloy: Effect of laser energy input

机译：选择性激光熔化Ti-5A2.5SNαα钛合金的致密化行为，微观结构演化和机械性能：激光能量输入的影响

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摘要

Selective laser melting (SLM) technology was employed for the additive manufacturing of Ti-5Al-2.5Sn alpha titanium alloy in this work and the influences of laser energy input on densification behavior, microstructure evolution and mechanical performances of the as-deposited products were investigated. It was found that the relatively high volumetric energy densities (VEDs) of 167-417 J/mm(3) resulted in large quantities of keyhole-induced spherical pores whereas the relatively low VEDs of 51-83 J/mm(3) led to notable lack-of-fusion defects. At the proper VED of 125 J/mm(3), highly densifled products with internal porosity of merely 0.05% were obtained. At the relatively high VEDs of 167-417 J/mm(3), as-built samples presented duplex microstructures composed of acicular alpha' martensites and bulk alpha(M) massive grains. In contrast, overwhelmingly martensitic microstructures were formed at lower VEDs of 51-125 J/mm(3). The martensitic microstructure exhibited a unique hierarchical feature, which could be explained using the theory of athermal martensitic transformation kinetics. With the decrease of VED from 417 J/mm(3), the average size of alpha' needles increased first, then came to its plateau at the VEDs of 167-208 J/mm(3), and decreased again at the VEDs of 51-167 J/mm(3). At the VEDs of 167-417 J/mm(3), the formation of spherical pores and bulk alpha(M) grains resulted in relatively poor tensile properties. At the VEDs of 51-83 J/mm(3), the formation of lack-of-fusion defects masked the enhanced fine-grain strengthening effect provided by the much refined alpha' needles and the decrease in the fraction of bulk alpha(M), thus also leading to very limited tensile properties. At the proper VED of 125 J/mm(3), as-built tensile properties reached to their peak with ultimate tensile strength of 1173 MPa, yield strength of 1061 MPa, and elongation of 7.7%. This can be attributed to the high densification degree, the almost complete vanish of bulk alpha(M) grains, and the moderate size of alpha' needles. (C) 2018 Elsevier B.V. All rights reserved.
机译：选择性激光熔化（SLM）技术用于Ti-5Al-2.5Snα钛合金的添加剂制造，并研究了激光能量输入对致密化行为的影响，进行了沉积产品的微观结构演化和机械性能。发现，167-417J / mm（3）的相对高的体积能密度（VED）导致大量的钥匙孔诱导的球形孔，而51-83J / mm（3）的相对低的VED导致值得注意的缺乏融合缺陷。在125J / mm（3）的适当VED，获得了仅0.05％内部孔隙率的高度致密的产品。在167-417 J / mm（3）的相对较高的VED中，竣工样品呈现由针状α的马氏体和散装α（m）大粒组成的双工微结构。相比之下，在51-125J / mm（3）的较低VED下形成压倒性的马氏体微观结构。马氏体微观结构表现出独特的等级特征，可以使用滴管马氏体转化动力学理论来解释。随着417 j / mm（3）的ved减少，alpha'针的平均大小首先增加，然后在167-208 j / mm（3）的Veds的高原上，并在veds中再次下降51-167 J / mm（3）。在167-417 j / mm（3）的VED，形成球形孔和散装α（m）颗粒，导致拉伸性能相对较差。在51-83 J / mm（3）的VED中，缺乏融合缺陷的形成掩盖了众多精炼α针提供的增强的细粒强化效果和散装α的一部分减少（m ）因此也导致拉伸性质非常有限。在125J / mm（3）的适当VEE中，由于1173MPa的极限拉伸强度达到其峰值，屈服强度为1061MPa，伸长率为7.7％。这可以归因于高致密程度，散装α（m）颗粒的几乎完全消失，以及α的中等大小。 （c）2018年elestvier b.v.保留所有权利。

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