Effect of Support Height on Microstructure and Mechanical Properties of Selective Laser Melting Ti

DOI：

10.1007/s40195-023-01612-w

发表时间：

2023-10

期刊：

Acta Metallurgica Sinica (English Letters)

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

Libo Zhou;Xisheng Bi;Jinshan Sun;Zhiming Hu;Cong Li;Jian Chen;Y. Ren;Yan Niu;W. Qiu

本研究首次对不同支撑高度的选择性激光熔化Ti-15Mo合金进行了研究。随着支撑高度的增加，试样形成微裂纹和小孔的风险增大，而试样的延性降低。随着支架高度的增加，样品的晶粒尺寸减小，这是由于SLM过程中更有效的散热速率。样品的平均晶粒尺寸分别为36.95±0.7 μm （5 mm-sample I）、35.24±0.7 μm （10 mm-sample II）和33.91±0.7 μm （15 mm-sample III）。随着支撑高度的增加，（111）织构强度增大，取向偏差角逐渐减小。三种试样的极限抗拉强度、屈服强度和塑性分别为970±13 MPa、769±12 MPa和9.78%±1.5%（试样一）、1051±11 MPa、932±11 MPa和7.17%±2%（试样二）、1123±14 MPa、1089±9 MPa和5.4%±1.4%（试样三）。晶粒尺寸的减小、位错密度的增大和（111）织构的增强都有利于获得更高的强度。

In this research, for the first time, the Ti–15Mo alloy generated via selective laser melting (SLM) with many different support heights was examined. With the increase of the support height, the risks of forming microcracks and small holes increase while the ductility of the sample decreases. The grain sizes of the samples decrease with an increase in support height because of the more efficient heat dissipation rate during the SLM process. The average grain sizes of the samples are 36.95 ± 0.7 μm (5 mm-sample I), 35.24 ± 0.7 μm (10 mm-sample II) and 33.91 ± 0.7 μm (15 mm-sample III), respectively. As the support height increases, the intensity of (111) texture increases and the misorientation angles gradually decrease. The ultimate tensile strength, yield strength and ductility of the three samples are 970 ± 13 MPa, 769 ± 12 MPa and 9.78% ± 1.5% (sample I), 1051 ± 11 MPa, 932 ± 11 MPa and 7.17% ± 2% (sample II), 1123 ± 14 MPa, 1089 ± 9 MPa and 5.4% ± 1.4% (sample III), respectively. The decrease in grain size, increase in dislocation density and enhancement of the (111) texture are all conducive to achieving the higher strength.

Effect of Support Height on Microstructure and Mechanical Properties of Selective Laser Melting Ti–15Mo Alloy

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