The influence of heat treatment on hydrogen environment-assisted cracking (HEAC) of Monel K-500 was investigated through slow-rising stress intensity loading while immersed in NaCl solution under cathodic polarization. Crack growth kinetics and fractography confirm enhanced HEAC susceptibility for over-aged Monel K-500 relative to the non-aged condition. Differences in microstructural parameters sensitive to heat treatment variations are evaluated in the context of HEAC susceptibility with specific focus on impurity segregation to grain boundaries, grain size, grain boundary character/connectivity, yield strength, hydrogen uptake/trapping, and global/local slip morphology and evolution.
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