【作者】 马玉喜； 荣凡； 周荣； 朗宇平； 蒋业华；

【Author】 Ma Yuxi~(1,2) Rong Fan~2 Zhou Rong~1 Lang Yuping~2 Jiang Yehua~1 (1.Kunming University of Science and Technology Faculty of Mechanical and Electrical Engineering,Kunming,650093;2.Central Iron & Steel Research Institute,Beijing,100081)

【机构】 昆明理工大学机电工程学院； 钢铁研究总院结构材料研究所；

【摘要】 在-60℃～室温范围内,采用夏比冲击试验测定材料的韧—脆转变温度(DBTT),并通过对冲击断口的扫描电镜(SEM)观察和透射电镜(TEM)观察等方法,对几种不同含氮量奥氏体不锈钢在低温下发生韧—脆转变的现象进行了研究。结果表明：在超高氮奥氏体钢中,随氮含量的增加该钢种发生韧—脆转变的温度上升,符合 DBTT=300C_N-303(℃)方程式：在 Charpy 冲击测试试验中除大量高密度位错和层错外未发现奥氏体基体结构变化, 其断口形貌由韧窝→韧窝和似准解理→似解理脆断变化,断裂形式为以穿晶主的混合断裂。更多还原

【Abstract】 The DBTT of super-high nitrogen containing austenitic stainless steels was tested between room-temperature and -60"C by Charpy-type test,and the ductility and brittleness transition of it was investigated under low temperature by the SEM,TEM and XRD methods.The results show that for super-high nitrogen containing austenitic stainless steels,the DBTT is shifted to high temperature,which accords with the equation DBTT=300C_N-303(℃);it only shows a lot of fault ribbon and high density dislocation but not to detect variation of austenitic matrix during Charpy-type test,The change of fracture patterns of the stainless steels is dimple→dimple and cleavage-like fracture→cleavage-like fracture,and fracture mode is a mix fracture with primary transgranular fracture.更多还原