Abstract
STS309(L) is widely used as a welding material for dissimilar welding of carbon steel and stainless steel. In general, austenitic stainless steel does not perform post-weld heat treatment (PWHT) to relieve thermal stress even after welding due to a sensitization. However, in the case of dissimilar joints between carbon steel and stainless steel, PWHT is often performed to relieve the thermal stress resulting from welding in carbon steel. Nevertheless, the stainless steel side may be subjected to heat treatment during PWH, leading to a deterioration in the mechanical properties of the stainless steel. Therefore, in this study, we investigated the effects of PWHT duration on the ferrite volume fraction, ferrite number, and mechanical properties. Through this, we aimed to determine the maximum post-heat treatment duration. The chemical composition did not change with an increase in the post-heat treatment time; however, the elongation and ferrite number decreased, and the tensile strength increased.
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