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The Effect of Post-weld Heat Treatment on the Corrosion Behavior of Different Weld Zones of Titanium Ti-6Al-4V Alloy by Friction Stir Welding
Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-09-16 , DOI: 10.1007/s11665-020-05115-y
Alireza Nasresfahani , Abdol Reza Soltanipur , Khosro Farmanesh , Ali Ghasemi

This study aims to investigate the effect of post-weld heat treatment on the corrosion behavior of different weld zones of titanium Ti-6Al-4V alloy by friction stir welding. Thus, the friction stir welding was used to join 3-mm-thick sheets of Ti-6Al-4V titanium alloy. Then, the welded sample from the optimal conditions underwent normalized heat treatment at 950 °C for 1 h in an argon inert gas environment. Next, the microstructures of different weld zones were examined using field emission scanning electron microscopy (FESEM), elemental analysis via EDS, phase analysis by XRD, and corrosion behavior through potentiostat equipment in HCl 5% solution. The results obtained from post-weld heat treatment also indicated that these operations significantly enhance the potential and converge the corrosion rate of different weld zones. Specifically, if the corrosion rate of the transition zone before heat operations is around 3.5 times that of the friction stir zone and 10 times that of the base metal, this difference will be less than 2.5 times that of the friction and 4 times that of the base metal following post-weld heat treatment. The post-weld heat treatment has reduced the difference in corrosion rate across various weld zones, but it has not made any changes in the corrosion rate of welds obtained at different traverse speeds.



中文翻译:

焊后热处理对搅拌摩擦焊Ti-6Al-4V钛合金不同焊接区腐蚀行为的影响

本研究旨在探讨搅拌摩擦焊接后热处理对Ti-6Al-4V钛合金不同焊接区腐蚀行为的影响。因此,使用摩擦搅拌焊接来接合3mm厚的Ti-6Al-4V钛合金板。然后,将来自最佳条件的焊接样品在氩气惰性气体环境中于950°C进行标准热处理1 h。接下来,使用场发射扫描电子显微镜(FESEM),通过EDS进行的元素分析,通过XRD进行的相分析以及通过恒电位仪设备在5%HCl溶液中的腐蚀行为,检查了不同焊接区的显微组织。从焊接后热处理获得的结果还表明,这些操作显着提高了电势并收敛了不同焊接区的腐蚀速率。特别,如果在加热操作之前过渡区的腐蚀速率约为摩擦搅拌区的3.5倍和母材的10倍,则该差异将小于摩擦力的2.5倍和母材的4倍。焊后热处理。焊后热处理降低了各个焊接区域之间的腐蚀速率差异,但并未改变以不同的行进速度获得的焊缝的腐蚀速率。

更新日期:2020-09-16
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