Yang Xin, Ma Wenjun, Gu Wenping, Zhang Zhaoyang, Wang Ben, Wang Yan, Liu Shifeng
College of Materials Science and Engineering, Xi'an University of Technology Xi'an 710048 China
Electronic Science and Technology, Chang'an University Xi'an 710061 China.
RSC Adv. 2021 Jun 29;11(37):22734-22743. doi: 10.1039/d1ra02355a. eCollection 2021 Jun 25.
The tensile performance of Ti6Al4V alloy lattice structure was investigated. Firstly, a face center cubic unit cell with vertical struts (F2CCZ) lattice structure was designed. Then, the structures were fabricated by selective laser melting (SLM) with different aspect ratios. Subsequently, the SLM-ed alloys were subjected to double solution-aging to homogenize the microstructure and release residual stress. It is shown that there is only acicular α' martensite with high dislocation density in the SLM-ed alloy, while the heat-treated alloy has α and β phases (there are multi-scale α laths and nano-scale β particles), and the orientation relationship between the two phases is: [113]//[1210]. The tensile strength of the HT-ed alloys presents a significant increase from 140 ± 18 MPa in the SLM-ed state to 229 ± 5.1 MPa with an aspect ratio of 4. It indicates that the special heat treatment regime can not only homogenize the microstructure of the SLM-ed alloy, but also improve the tensile strength.
研究了Ti6Al4V合金晶格结构的拉伸性能。首先，设计了一种具有垂直支柱的面心立方单胞（F2CCZ）晶格结构。然后，通过选择性激光熔化（SLM）制备了具有不同长径比的结构。随后，对SLM处理后的合金进行双重固溶时效处理，以均匀化微观结构并释放残余应力。结果表明，SLM处理后的合金中仅存在具有高位错密度的针状α'马氏体，而热处理后的合金具有α相和β相（存在多尺度α板条和纳米级β颗粒），两相之间的取向关系为：[113]//[1210]。热处理合金的抗拉强度从SLM处理状态下的140±18 MPa显著提高到长径比为4时的229±5.1 MPa。这表明特殊的热处理制度不仅可以使SLM处理合金的微观结构均匀化，还可以提高抗拉强度。
