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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure, Mechanical, and Fatigue Strength of Ti-54M Processed by Rotary Swaging
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Microstructure, Mechanical, and Fatigue Strength of Ti-54M Processed by Rotary Swaging

机译：旋转型锻Ti-54M的组织，力学和疲劳强度

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摘要

TIMETAL 54M is a newly developed (alpha + beta) titanium alloy with nominal composition Ti-5Al-4V-0.6Mo-0.4Fe. The alloy can provide a cost benefit over Ti-6Al-4V due to improved machinability and formability. In the present work, evolution of mechanical properties in terms of tensile and hardness values is investigated as a function of deformation degrees imposed via rotary swaging (RS). Microstructure, mechanical properties, and fatigue performance of Ti-54M are investigated after severe plastic deformation by RS conducted at 850 degrees C and after being subjected to two different post-swaging annealing conditions. Optical microscopy and scanning electron microscopy using electron back scatter diffraction were utilized to document the evolution of the microstructure. Tensile tests were conducted to characterize mechanical properties. RS, to a true strain of 3.0, is found to lead to a marked ultrafine-grained structure of about 1 lm grain size with low content of high angle grain boundaries (HAGBs). Post-swaging heat treatment at 800 degrees C followed by air cooling did not change the grain size but exhibited high content of HAGBs. Post-swaging heat treatment at 940 degrees C followed by furnace cooling resulted in a grain size of about 5 mu m and enhanced work-hardening capability and ductility, which resulted in less fatigue notch sensitivity, but at the same time lower fatigue strength at 10(7) cycles.
机译：TIMETAL 54M是一种新开发的（α+β）钛合金，其名义成分为Ti-5Al-4V-0.6Mo-0.4Fe。由于改善了可加工性和可成形性，该合金可以提供优于Ti-6Al-4V的成本优势。在本工作中，研究了机械性能在拉伸强度和硬度值方面的变化，该变化是通过旋转型锻（RS）施加的变形程度的函数。在850℃下通过RS进行严重的塑性变形后，以及在经受两种不同的模锻后退火条件后，研究了Ti-54M的组织，力学性能和疲劳性能。使用电子背散射衍射的光学显微镜和扫描电子显微镜记录了微观结构的演变。进行拉伸测试以表征机械性能。发现RS的真实应变为3.0，可导致明显的超细晶粒结构，晶粒尺寸约为1 lm，而高角度晶粒边界（HAGB）含量较低。在800摄氏度下进行模锻后的热处理，然后进行空冷，并没有改变晶粒尺寸，但显示出高含量的HAGB。在940摄氏度下进行模锻后的热处理，然后进行炉内冷却，使晶粒尺寸约为5微米，并增强了加工硬化能力和延展性，从而降低了疲劳缺口敏感性，但同时降低了疲劳强度（10℃） （7）循环。

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