当前位置: X-MOL 学术Mater. Charact. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Effects of electroshock treatment on microstructure evolution and texture distribution of near-β titanium alloy manufactured by directed energy deposition
Materials Characterization ( IF 4.8 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.matchar.2020.110137
Lechun Xie , Haojie Guo , Yanli Song , Chang Liu , Zhongqi Wang , Lin Hua , Liqiang Wang , Lai-Chang Zhang

Abstract Electroshock treatment (EST) can influence the microstructure of a material in a short time through the coupling of the thermal and nonthermal effects of a high-density pulsed current. In this study, a Ti-55531 near-β titanium alloy manufactured by a laser-based directed energy deposition was processed via EST, and the microstructure was characterized via scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). After the EST, small subgrains were precipitated in the large columnar β grains. With an increase in the EST time, the α phase precipitated along the grain boundary tended to grow, the curvature radius of the α tips increased, and distinct spheroidization occurred. The EBSD results indicated that after the EST, the maximum texture intensity of the β phase decreased from 23.18 to 13.15, and the texture intensity exhibited a uniform distribution. The foregoing results were attributed to the thermal and nonthermal effects of the EST, which led to an energy concentration on the tips of the needle-like α phase and the phase transformation of the tips. When the high current passes through the sample, both the thermal and nonthermal effects are introduced, the thermal effect cause the increase of sample's temperature, and the nonthermal effect shows as the form of special forces such as the electrostatic and electronic wind forces, which can influence the movement of dislocation. This work is expected to provide a new method for optimizing the microstructure of the near-β titanium alloys manufactured by a laser-based directed energy deposition.

中文翻译:

电击处理对定向能量沉积制备近β钛合金组织演变和织构分布的影响

摘要 电休克处理(EST)可以通过高密度脉冲电流的热效应和非热效应的耦合,在短时间内影响材料的微观结构。在这项研究中,采用激光定向能量沉积制造的 Ti-55531 近 β 钛合金通过 EST 进行处理,并通过扫描电子显微镜 (SEM) 和电子背散射衍射 (EBSD) 对其微观结构进行表征。EST后,小的亚晶粒在大的柱状β晶粒中析出。随着EST时间的增加,沿晶界析出的α相趋于长大,α尖端的曲率半径增大,出现明显的球化现象。EBSD 结果表明 EST 后,β 相的最大织构强度从 23.18 下降到 13.15,并且纹理强度呈现均匀分布。上述结果归因于 EST 的热和非热效应,导致能量集中在针状 α 相的尖端和尖端的相变。当大电流通过样品时,同时引入热效应和非热效应,热效应导致样品温度升高,非热效应表现为静电和电子风力等特殊作用力的形式,可影响位错的运动。这项工作有望为优化通过基于激光的定向能量沉积制造的近β钛合金的微观结构提供一种新方法。上述结果归因于 EST 的热和非热效应,导致能量集中在针状 α 相的尖端和尖端的相变。当大电流通过样品时,同时引入热效应和非热效应,热效应导致样品温度升高,非热效应表现为静电和电子风力等特殊作用力的形式,可影响位错的运动。这项工作有望为优化通过基于激光的定向能量沉积制造的近β钛合金的微观结构提供一种新方法。上述结果归因于 EST 的热和非热效应,导致能量集中在针状 α 相的尖端和尖端的相变。当大电流通过样品时,同时引入热效应和非热效应,热效应导致样品温度升高,非热效应表现为静电和电子风力等特殊作用力的形式,可影响位错的运动。这项工作有望为优化通过基于激光的定向能量沉积制造的近β钛合金的微观结构提供一种新方法。这导致能量集中在针状 α 相的尖端和尖端的相变。当大电流通过样品时,同时引入热效应和非热效应,热效应导致样品温度升高,非热效应表现为静电和电子风力等特殊作用力的形式,可影响位错的运动。这项工作有望为优化通过基于激光的定向能量沉积制造的近β钛合金的微观结构提供一种新方法。这导致能量集中在针状 α 相的尖端和尖端的相变。当大电流通过样品时,同时引入热效应和非热效应,热效应导致样品温度升高,非热效应表现为静电和电子风力等特殊作用力的形式,可影响位错的运动。这项工作有望为优化通过基于激光的定向能量沉积制造的近β钛合金的微观结构提供一种新方法。非热效应表现为静电和电子风力等特殊力的形式,可以影响位错的运动。这项工作有望为优化通过基于激光的定向能量沉积制造的近β钛合金的微观结构提供一种新方法。非热效应表现为静电和电子风力等特殊作用力的形式,可以影响位错的运动。这项工作有望为优化通过基于激光的定向能量沉积制造的近β钛合金的微观结构提供一种新方法。
更新日期:2020-03-01
down
wechat
bug