Influence mechanism of microstructure variation on mechanical properties of laser melting deposition Ti–6Al–4V alloy under electroshocking treatment
Influence mechanism of microstructure variation on mechanical properties of laser melting deposition Ti–6Al–4V alloy under electroshocking treatment
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DOI：
10.1016/j.jmrt.2023.06.089
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发表时间：
2023-07
期刊：
影响因子：
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通讯作者：
Yan Wen;Jian-guang Bi;Jian Zhou;H. Guo;J. Yi;Liqiang Wang;L. Hua;Lechun Xie
中科院分区：
文献类型：
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作者：
Yan Wen;Jian-guang Bi;Jian Zhou;H. Guo;J. Yi;Liqiang Wang;L. Hua;Lechun Xie
在这项工作中，对激光熔融沉积（LMD）制备的Ti-6Al-4V合金进行了电休克处理（EST），并研究了其微观结构和力学性能的变化。结果表明，EST后LMD Ti-6Al-4V中柱状晶尺寸减小，α细化明显。由于EST的作用，篮子组织的微观结构得以存在。电子背散射衍射(EBSD)结果表明EST可以降低取向浓度并削弱织构。 Ti-6Al-4V 中的织构是在 LMD 过程中形成的，在 EST 后变得均匀且弱。在力学性能上，EST 0.04 s后，试样的显微硬度增加，屈服强度变化较小，由于微区相变，应变增加更明显。压缩断裂形貌表明，由于微观结构的变化，LMD Ti-6Al-4V 的断裂模式从脆性断裂转变为韧性断裂。基于以上研究结果表明，EST是调控LMD钛合金显微组织、改变LMD钛合金综合力学性能的一种新的探索方法。
In this work, the electroshocking treatment (EST) was applied on the Ti–6Al–4V alloys prepared by laser melting deposition (LMD), and the evolutions of microstructure and mechanical property were investigated. The results indicated that the size of columnar grains in LMD Ti–6Al–4V was reduced after EST, and the α refinement was obvious. The basket weave microstructure existed due to the effect of EST. The results of electron backscatter diffraction (EBSD) showed that EST could reduce the orientation concentration and weaken the texture. The texture in Ti–6Al–4V was formed during LMD, and it became uniform and weak after EST. On the mechanical properties, the microhardness of specimen increased after EST with 0.04 s, and the yield strength changed little and the strain increased more obviously because of the microregion phase transition. The compression fracture morphology revealed that the fracture mode of LMD Ti–6Al–4V changed from the brittle fracture to ductile fracture because of the microstructure variation. Based on above results, it demonstrates that EST is a new exploration method to manipulate the microstructure of LMD titanium alloys and modify the comprehensive mechanical properties of LMD titanium alloys.