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Intergranular reheat cracking occurs in the coarse-grained heat affected zone (CGHAZ) of weldment after post-weld heat treatment (PWHT) or under the service condition.1,2) It has been suggested that the reheat cracking is attributed to grain interiors strengthened by MX precipitates and soft prior austenite grain boundaries (PAGBs) resulting from the depletion of alloying elements.3–6) During exposure to high temperature, the thermal stress is concentrated at the soft denuded zone, causing the intergranular cracking in which the revealed PAGBs surfaces include dimples considered as micro-ductile fracture areas.7–9) On the other hand, lots of studies have supported that the segregation of impurities (especially, phosphorus) to the PAGBs causes the intergranular cracking by lowering the cohesive grain boundary strength.10–23) The T/ P23 heat-resistant steel (2.25Cr1.5WVNb) has been known to show a high susceptibility to the reheat cracking. Meanwhile, the T/P92 heat-resistant steel (9Cr1.5W0.5MoVNb) is not susceptible to the reheat cracking.1,2) It is the purpose of this research to investigate the reason for the difference in intergranular cracking susceptibility of T/P23 and T/P92 heat-resistant steels.

Difference in Reheat Cracking Susceptibility of 2.25Cr-W and 9Cr-W Heat-resistant Steels