The development of the microstructure in the coarse-grained, heat- affected zone (CGHAZ) of two medium-strength Ti-V microalloyed steels was examined. Single-pass welding of 19mm-thick plates at 5.5kJ/mm resulted in a smaller austenite grain size and a correspondingly narrower CGHAZ in the low-Ti, high-V steel than in the high-Ti, low-V steel. The observed effect is correlated to the differing stability of microalloy precipitates, TiN/TiCN in the high-Ti, low-V steel and TiVN/TiVCN ...
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