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研究了真空熔炼 Fe- 38Mn奥氏体合金电渣重熔前后系列冲击试样的断口形貌以及杂质元素和锰在晶界及晶内的分布。结果表明 :真空熔炼 Fe- 38Mn合金存在明显的韧脆转变现象 ,77K冲击功仅为 2 5 J,断口为沿晶断裂特征。经电渣重熔后 ,韧脆转变现象消失 ,77K的冲击功高达 30 0 J,断口以韧窝为主并有少量准解理小刻面。电渣重熔后硫的偏聚明显降低。该合金低温沿晶断裂的产生与硫在晶界的偏聚有关。
The fracture morphology and the distribution of impurity elements and manganese in the grain boundary and in the grain of the impact samples before and after ESR of Fe-38Mn austenitic alloy were investigated. The results show that there are obvious ductile and brittle transition phenomena in Fe-38Mn alloy melted by vacuum. The 77K impact energy is only 25 J, and the fracture is the intergranular fracture. After electroslag remelting, the ductile-brittle transition phenomenon disappears. The impact energy of 77 K is as high as 30 0 J. The fracture is dominated by dimples and has a small amount of quasi-cleavage facets. After partial remelting of sulfur partial segregation significantly reduced. The low temperature intergranular fracture of the alloy is related to the segregation of sulfur in the grain boundaries.