摘要
在-200℃～室温范围内，采用拉伸和夏比冲击试验测定了1Cr22Mn15N高氮奥氏体不锈钢的韧-脆转变温度（DBTT），并通过扫描电镜（SEM）、透射电镜（TEM）和X射线衍射（XRD）等方法对该钢在低温下的韧-脆转变现象进行了研究。结果表明：该钢发生韧一脆转变的温度在-110℃左右；最早出现脆性滑移平台的温度在-80℃，并有诱发的ε相出现；其断口形貌由韧窝→韧窝＋准解理→解理脆断变化，断裂形式为穿晶断裂；可能是由于在脆性第二相上形成微裂纹，导致在两个滑移面之间产生穿晶脆性断裂。
The DBTT of high nitrogen austenitic stainless steel 1Cr22Mn15N was tested between roorrr temperature and --200 ℃ by tensile test and 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 1Cr22MnlSN, the DBTT is about -- 110℃. Brittle fracture occurrs first at -- 80℃. The change of fracture patterns of high nitrogen austenitic stainless steels is dimple→dimple＋quasi-cleavage fracture→cleavage fracture, and fracture mode is transgranular fracture, ε-martensite is observed by TEM in brittle transition austenite and induced along { 111 } γ plane.
出处
《机械工程材料》
CAS
CSCD
北大核心
2007年第10期23-26,共4页
Materials For Mechanical Engineering
基金
国家重点基础研究规划(973)资助项目(2004CB619100)
关键词
高氮奥氏体不锈钢钢
夏比冲击试验
韧-脆转变
穿晶断裂
high nitrogen austenitic stainless steel
Charpy-type test
ductile to brittle transition
transgranular fracture
