Effect of electroshocking treatment on the microstructure and mechanical properties of laser melting deposited near-β Ti-55531 thin-wall
Effect of electroshocking treatment on the microstructure and mechanical properties of laser melting deposited near-β Ti-55531 thin-wall
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电休克处理对激光熔化沉积近β Ti-55531 薄壁微观结构和机械性能的影响
DOI：
10.1016/j.jallcom.2022.168187
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发表时间：
2022-11
影响因子：
6.2
通讯作者：
Lechun Xie
中科院分区：
文献类型：
--
作者：
Yan Wen;Pu Liu;Haojie Guo;Linli Tian;Liqiang Wang;Zhiyang Wang;Lin Hua;Lechun Xie
采用激光熔凝沉积技术制备了近β结构的Ti-55531(Ti-5Al-5Mo-5V-3CR-1Zr，wt%)薄壁合金，并对其进行了电击后处理。利用扫描电子显微镜(SEM)、电子背散射衍射仪(EBSD)和X射线衍射仪(X射线衍射仪)表征了EST前后的组织演变。结果表明，沉积态组织主要由短柱状晶和等轴晶组成，呈现出短柱状晶-等轴晶-短柱状晶交替的独特结构。电子背散射光谱结果表明，酯化处理可以降低β相的取向浓度，削弱其织构。X-射线衍射仪结果表明，EST后α相含量略有增加。EST后β相的微观应变和晶格常数发生了变化，这可能是由于α析出、α/β界面产生晶体缺陷和织构强度降低所致。力学性能测试结果表明，EST可以提高材料的显微硬度、屈服强度和拉伸强度，这是由于材料的显微组织发生了变化所致。结果表明，等温淬火是优化LMD-Near-β钛合金组织和提高力学性能的有效途径。
The near-β Ti-55531 (Ti-5Al-5Mo-5V-3Cr-1Zr, wt%) alloy with thin-wall structures were manufactured by laser melting deposition (LMD), and followed by the post-processing of electroshocking treatment (EST). The microstructure evolution before and after EST were characterized via using the scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and X-ray diffraction (XRD). The results showed that the microstructure of as-deposited specimen was mainly composed of short columnar grains and equiaxed grains, showing a unique structure of alternating short columnar grains-equiaxed grains-short columnar grains. The results of EBSD showed that EST could reduce the orientation concentration and weaken the texture of β phase. XRD results indicated that the α phase content slightly increased after EST. The micro-strain and lattice constant of β phase were changed after EST, which were probably ascribed to the precipitation of α, the generation of crystal defects on α/β interface, and the decrease of texture intensity. The results of mechanical properties indicated that EST could increase the microhardness, the yield strength and the tensile strength, which were due to the variation of microstructure. All results show that EST is an effective approach for optimizing the microstructure and improving the mechanical properties of LMD near-β titanium alloy.
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