In-situ observation of microstress and solid state transformation in low temperature transformation weld metal by synchrotron radiation X-rays

Zhang, S.; Terasaki, Hidenori*; Komizo, Yuichi*

In weld metal, it is important to decrease the residual stress of the welded joints because residual stress generated by welding promotes brittle fracture, stress corrosion cracking. As one of a countermeasure to use a volume expansion of martensitic transformation during low temperature transformation (LTT) has been examined. Then to establish this examination, the interplay between a solid state transformation and a stress deformation is very important. In this colloquium, we will present in-situ observation of the relationship between the stress deformation and the martensitic transformation of LTT, by using synchrotron radiation X-rays.