电渣重熔对Fe-38Mn奥氏体合金低温沿晶脆性的抑制作用  

INFLUENCE OF ELECTROSLAG REMELTING ON SUPPRESSION OF CRYOGENIC INTER-GRANULAR FRACTURE IN Fe-38Mn AUSTENITIC ALLOY

作　　者：郑炀曾[1] 付瑞东[1] 李少华[2] 周惠华[3] 

机构地区：[1]燕山大学 [2]钢铁研究总院 [3]清华大学

出　　处：《钢铁》2000年第12期54-57,共4页Iron and Steel

基　　金：国家自然科学基金资助项目(59771001)

摘　　要：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 surface of series impact specimens and the grain boundary chemistries of VIM(vacuum induction melted) Fe 38Mn austenitic alloy before and after ESR(electro slag re melting)were investigated.The results show that the VIM Fe 38Mn austenitic alloy undergoes an obvious tough to brittle transition,and the 77 K impact work of VIM alloy is only 25 J,the fracture mode is IGF(intergranular fracture).After ESR the 77 K impact work is up to 300 J,the fracture mode is of mixed microvoid coalescence and quasi cleavage.The S segregation is decreased after ESR. From above results,it can be known that the cryogenic IGF of VIM Fe 38Mn austenitic alloy is related to the S segregation at grain boundaries.

关 键 词：高锰奥氏体合金 低温沿晶断裂 晶界偏聚 电渣重熔 

分 类 号：TG113[金属学及工艺—物理冶金]