Phase transformation dynamics during welding of Ti-6Al-4V

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作者：
机构：
[1] Elmer, J.W.
[2] Palmer, T.A.
[3] Babu, S.S.
[4] Zhang, W.
[5] DebRoy, T.
来源：
Elmer, J.W. (elmer1@llnl.gov) | 1600年 / American Institute of Physics Inc.卷 / 95期
关键词：
Annealing - Cooling - Crystal structure - Electric arc welding - Martensite - Microstructure - Phase equilibria - Phase transitions - Reaction kinetics - Synchrotron radiation - Welding - X ray diffraction;
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摘要：
Phase transformation sequence during gas tungsten arc welding of Ti-6Al-4V was investigated. Synchrotron radiation was employed for the in situ measurements in both the fusion zone (FZ) and the heat-affected zone (HAZ) of the weld. The results show that significant superheat is required above the β transus temperature to complete the α&rarrβ phase transformation during weld heating. It was found that the amount of superheat decreases with distance from the center of the weld where the heating rates are lower.
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