Pages 67-68
In this study, tensile tests were carried out on four kinds of high-strength steels by radical nitriding (Die steel; SKD61,Maraging steel; YAG300,Structural steel; SNCM439 and High carbon chromium bearing steel; SUJ2). The influence of nitriding on stress-strain behavior and mechanical properties were investigated. As a result, fracture ductility of these materials was decreased by nitriding. The decrease of fracture ductility was related to the crack occurrence on specimen surface. On the nitrided steel, the main reason for the decrease of fracture ductility was surface embrittlement due to nitriding.
