夏比冲击试验
回火
脆化
X射线光电子能谱
材料科学
冶金
马氏体不锈钢
马氏体
脆性
断裂(地质)
复合材料
微观结构
核磁共振
物理
作者
Eleonora Bolli,Alessandra Fava,S. Kačiulis,A. Mezzi,Roberto Montanari,Alessandra Varone
摘要
Cr martensitic steels are promising materials for structural applications in future nuclear fusion reactors. Because the embrittlement after tempering treatments can be a serious problem, the fracture mode of a steel with 10.5 wt% of Cr treated at 700°C for 18 h has been investigated through Charpy tests in the temperature range from −100°C to +150°C. X‐ray photoelectron spectroscopy (XPS) analyses carried out on the fracture surfaces evidenced the segregation of Cr in both ductile and brittle (quasicleavage) fields. The unexpected result indicates that Cr segregation weakens the atomic bonds; thus, the fracture path in both the cases corresponds to the zones with higher Cr content.
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