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Microstructural evolution and mechanical properties of a linear friction welded two-phase Ti-6.5Al-3.5Mo-1.5Zr-0.3Si titanium alloy joint
Materials Science and Engineering: A ( IF 6.4 ) Pub Date : 2018-11-14 , DOI: 10.1016/j.msea.2018.11.059
Xinyu Wang , Wenya Li , Tiejun Ma , Xiawei Yang , Achilles Vairis

The microstructure, microtexture evolution and mechanical properties of a linear friction welded two-phase Ti-6.5Al-3.5Mo-1.5Zr-0.3Si titanium alloy joint were investigated. Results show clear microstructural differences at the joint center and edge. A martensitic and acicular α microstructure was found in the weld center zone (WCZ) at the joint center and a Widmanstatten microstructure can be identified in the WCZ at the joint edge. Further away from the WCZ, the microstructural differences smoothed out. The cross-weld crystallographic texture was assessed using electron back scattered diffraction. There are different α texture components in WCZ and thermomechanically-affected zone, but the β textures are similar in these two areas. The microstructural differences at the joint center and edge are the cause of the differences in microhardness distribution and tensile properties along the welding direction. Following post weld heat treatment, the inhomogeneity in both microstructure and mechanical properties were reduced.



中文翻译:

线性摩擦焊接两相Ti-6.5Al-3.5Mo-1.5Zr-0.3Si钛合金接头的组织演变和力学性能

研究了线性摩擦焊接两相Ti-6.5Al-3.5Mo-1.5Zr-0.3Si钛合金接头的组织,微观组织演变和力学性能。结果显示在关节中心和边缘明显的微观结构差异。在接头中心的焊缝中心区域(WCZ)中发现了马氏体和针状的α显微组织,在WCZ接头边缘处发现了Widmanstatten显微组织。远离WCZ,微结构差异得以消除。使用电子反向散射衍射评估了交叉焊接的晶体学织构。WCZ和受热机械影响的区域中存在不同的α纹理成分,但是在这两个区域中,β纹理相似。接头中心和边缘的显微组织差异是沿焊接方向显微硬度分布和拉伸性能不同的原因。焊后热处理后,组织和机械性能的不均匀性均降低了。

更新日期:2018-11-14
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