Abstract
Two pass weld simulation has been used to investigate the precipitation mechanism of carbides in the coarse grained heat affected zones (HAZ) of two supermartensitic stainless steels, one high grade steel containing titanium and the other medium grade alloy without titanium. Recently, a model for such carbide precipitation has been proposed. According to this model, reheating of the HAZ in the martensitic stage is needed to provoke strong carbide formation. In the present work, the peak temperatures of the first and the second heating passes, the holding time during the second (reheating) pass and the holding temperature between the two passes have been varied in order to find the most favourable conditions for carbide precipitation in the two steels. In addition, measurements of the chromium content across prior austenite grain boundaries have been made for the titanium free steel.
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