Abstract
The stress corrosion cracking (SCC) behaviors of Ti-6Al-3Nb-2Zr-1Mo (Ti6321, in wt%) alloy samples with equiaxed microstructure (EM), bimodal microstructure (BM) and Widmanstätten microstructure (WM) in simulated 3000 m deep sea environment were investigated using electrochemical tests, electron backscattered diffraction (EBSD), and so on. WM exhibits the best SCC resistance, which is attributed to its best self-healing ability, and is beneficial for the re-passivation of fresh metal at the crack tip. Besides, there is no obvious micro-texture region in WM with higher β phase, and α phase colonies hinder the dislocation movement, resulting in the lowest crack growth rate.
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