Abstract
Abstract A novel means to improve the sub-zero impact toughness in the welding joints of 12Cr stainless steels was developed. The results indicated that the optimal conditions for performing the double post-welding heat treatment (PWHT) procedures were as follows: heating at 1000 °C for 15 min, followed by air cooling and then heating at 780 °C for 15 min, and finally air cooling. The welding joints subjected to double PWHT exhibited excellent mechanical and enhanced corrosion-resistance properties. Furthermore, the transition of the substructure in the martensitic grains was identified as the decisive factor for the improvement in the sub-zero toughness.
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