Influence of hydrogen on softened heat-affected zones during in-situ slow strain rate testing in advanced high-strength steel welds

Hydrogen stress cracking (HSC) of weldments should be evaluated as it occurs under environmental stress. This study investigated HSC reactions with regard to microstructures and hardness distribution in the transverse cross sections of welds deposited on an advanced high-strength steel through in-situ slow-strain rate testing (SSRT). SSRT in a hydrogen-free environment led to the fracture of the base metal, although a narrow and softened heat-affected zone (HAZ) was observed. However, during in-situ hydrogen charging SSRT, stress triaxiality increased in the softened inter-critical HAZ due to hydrogen trapped, and premature rupture was initiated from hydrogenpromoted voids with enhanced plasticity.

Automated summary

This study investigated hydrogen stress cracking reactions in weldments through in-situ slow-strain rate testing. The results showed that in the presence of hydrogen, stress triaxiality increased in the softened inter-critical heat-affected zone, leading to premature rupture initiated from hydrogen-promoted voids with enhanced plasticity.