Speaker
Joonoh Moon
(Ferrous Alloy Department)
Description
Reheating cracking susceptibility in the weld heat-affected zone (HAZ) of reduced activation ferritic-martensitic (RAFM) steels was explored by evaluating stress-rupture parameters (SRP), which depends on rupture strength and ductility. The HAZs simulation and stress-rupture experiments were carried out using a Gleeble simulator at various temperatures, corresponding to post-weld heat treatment (PWHT). After stress-rupture tests, fracture morphologies and cross-sectional microstructures were observed by a scanning electron microscopy (SEM) and a transmission electron microscopy (TEM). The results revealed that the reheating cracking occurred in the vicinity of the intergranular Cr23C6 precipitation, due to the formation of Cr-denuded zone along the grain boundary.
Co-authors
Chang-Hoon Lee
(Ferrous Alloy Department, Korea Institute of Materials Science, Changwon, South Korea)
Hyoung Chan Kim
(National Fusion Research Institute, Daejeon 305-806, South Korea)
Jin-Jong Lee
(Ferrous Alloy Department, Korea Institute of Materials Science, Changwon, South Korea;Pusan National University, Pusan 609-735, South Korea)
Joonoh Moon
(Ferrous Alloy Department, Korea Institute of Materials Science, Changwon, South Korea)
Jun-Young Park
(Ferrous Alloy Department, Korea Institute of Materials Science, Changwon, South Korea)
Tae-Ho Lee
(Ferrous Alloy Department, Korea Institute of Materials Science, Changwon, South Korea)
