Properties of the Weld Heat-Affected Zone in HY-130/150 Steel

摘要

Properties of the weld heat-affected zone, including hot-cracking tendencies and effects of thermal cycling on strength and toughness, were determined for a 5Ni-Cr-Mo-V steel developed as an HY-130/150 hull plate alloy. The hot-cracking tendency of the alloy was low. The yield strength of the heat-affected zone was equivalent to that of the base metal. The Charpy V-notch impact strength of samples which had received double thermal cycles, simulating multipass weldments, was equivalent to that of the baseplate in both the as-welded and the stress-relieved conditions. These results, obtained by weld-simulation methods, were confirmed by impact tests of samples from the heat-affected zone of actual weldments. The impact strength of the as-deposited weld metal was low compared to the baseplate and was greatly reduced by stress-relief treatment. (Author)