<正> 在高锰奥氏体钢(C=0.15％,Mn=26％,Al=4％,Si≤0.6％,S≤0.03％,P≤0.04％)高温塑性的研究中发现Mn的异常晶界偏析,致使钢高温时由塑性韧窝状断裂变为脆性沿晶断裂(图1)。但室温塑性无显著变化。
The abnormal segregation of Mn along grain boundaries in an austenitic steel containing 26％ Mn was identified by both Auger energy spectrum and ion microprobe analysis. The morphology of its high temperature fractogrph is shown as brittle intergranular fracture instead of normal ductile dimple.
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