Abstract
Reheating cracking susceptibility in the weld heat-affected zone of reduced activation ferritic-martensitic steel was explored by stress-rupture tests. The HAZ samples were experimentally simulated using Gleeble simulator with heat input of 30kJ/cm. After HAZ simulation, the samples were reheated to three different temperatures which correspond to post-weld heat treatment temperature, and stress-rupture tests were carried out. After the samples ruptured, fracture morphologies and cross-sectional microstructures were carefully observed by scanning electron microscopy and transmission electron microscopy. The results revealed that reheating cracking occurred in the vicinity of intergranular Cr23C6 carbides, due to the formation of soft denuded zone along the grain boundary. In addition, the reheating cracking susceptibility increased with increase in PWHT temperature.
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