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首页> 外文期刊>Journal of Materials Engineering and Performance >Fatigue Properties of Ti-6Al-4V Titanium Alloy Friction Stir Welding Joint
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Fatigue Properties of Ti-6Al-4V Titanium Alloy Friction Stir Welding Joint

机译：Ti-6AL-4V钛合金摩擦搅拌焊接接头的疲劳性能

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摘要

Friction stir welding was used to consolidate 2-mm-thick Ti-6Al-4V titanium alloy sheets, and the static and fatigue properties of the joint were investigated. The results reveal that uniform microhardness distribution of the nugget zone (NZ) after post-weld heat treatment was associated with the uniform equiaxed microstructure of the NZ. The joint fatigue limit predicted by the S-N curve reached 640.84 MPa, up to 64.76% of joint tensile strength. Fatigue specimens fractured at the transition zone between the base material and NZ, and the positions of fatigue crack initiation sites were relatively random. The fracture surface of the fatigue crack propagation region was composed of radial strips and striations, and numerous dimples were observed on the final fast fracture surface.
机译：使用摩擦搅拌焊接来巩固2mm厚的Ti-6Al-4V钛合金片，并研究了关节的静态和疲劳性能。 结果表明，焊接后热处理后块区（NZ）的均匀显微硬度分布与NZ的均匀等轴微观结构相关。 S-N曲线预测的关节疲劳极限达到640.84MPa，关节拉伸强度的64.76％。 在基材和NZ之间的过渡区处破坏疲劳试样，疲劳裂纹引发位点的位置相对随机。 疲劳裂纹传播区域的断裂表面由径向条带和晶片构成，并且在最终快速断裂表面上观察到许多凹槽。

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