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This study examines mechanisms for providing nuclei to equiaxed grains in the welds of pure ferritic stainless steel(FSS).The addition of the alloy element Ti to pure FSS 439 causes the precipitation of TiN,which can benefit the columnar-to-equiaxed transition(CET) of gas tungsten arc welding(GTAW).Meanwhile,the initial morphology of the precipitates,the concentration multiplications of Ti,N,etc.of FSS 439 should be controlled to induce the formation of CET during the short welding process.
This study examines mechanisms for providing nuclei to equiaxed grains in the welds of pure ferritic stainless steel (FSS). The addition of the alloy element Ti to pure FSS 439 causes the precipitation of TiN, which can benefit the columnar-to-equiaxed transition ( CET) of gas tungsten arc welding (GTAW). Meanwhile, the initial morphology of the precipitates, the concentration multiplications of Ti, N, etc. of FSS 439 should be controlled to induce the formation of CET during the short welding process.