Abstract
We elucidate here the effect of tungsten on grain refinement in the HAZ of ferritic stainless steels (FSSs) at 1200 °C and 1350 °C. The average simulated HAZ grain size of W-containing FSS (1.5 wt. pct W) was reduced by ~ 50 pct compared to W-free FSS at 1350 °C. The replacement of Mo with W in FSSs enhanced the thermal stability of Laves phase at high temperatures and contributed to fine grain size in the HAZ via pinning effect.
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