Ductile to Brittle Transition of SuperHigh Nitrogen Austenitic Stainless Steel
MA Yuxi1,2,RONG Fan2,ZHOU Rong1,LANG Yuping2,JIANG Yehua1
1. Faculty of Mechanical and Electrical Engineering， Kunming University of Science and Technology， Kunming 650093， Yunnan, China;2. Institute for Structural Materials, Central Iron and Steel Research Institute, Beijing 100081, China
Abstract：The DBTT of superhigh nitrogen containing austenitic stainless steel was measured by Charpy impact test from roomtemperature to -60 ℃ , and the ductility and brittleness transition at low temperature was investigated by SEM, TEM and XRD methods. The results show that except a lot of fault ribbons and high density dislocations the structure of austenitic matrix is not changed during Charpytype test.The fracture is changed from dimple to dimple and cleavagelike to cleavagelike, and fracture mode is a mixed one with transgranular as primary.
2008, Vol. 43 
