摘要
研究了不锈钢锻件在变形过程中的组织演变规律和裂纹形核与扩展机理,采用应力三维度法对锻件断裂破坏过程进行研究。结果表明,在热拉伸过程中不锈钢锻件的裂纹产生主要是经过裂纹形核、长大和聚集过程,变形过程中缩颈区域的显微孔洞更倾向于在晶界处产生。单向拉伸过程中,应力三轴度在越靠近心部的区域越大,则孔洞或者微裂纹越容易形成断裂。采用应力三轴度法可以准确判断不锈钢锻件在高温变形过程中的裂纹萌生和扩展过程,对于预测不锈钢锻件在高温锻造过程中损伤破坏过程具有重要的作用。
Microstructure evolution, crack nucleation and propagation mechanism of the stainless steel forgings during deformation were studied by controlling thermal tensile process. The fracture failure process of the forging was studied using stress triaxiality. The results show that the crack of the forging in hot stretching process is produced mainly by crack nucleation, growth and aggregation. Using stress triaxiality method can accurately judge the crack initiation process and expansion process in the forgings in high temperature deformation, which plays an important role in the prediction of stainless steel forging injury in high temperature in the process of forging destruction.
出处
《铸造技术》
北大核心
2017年第5期1188-1191,共4页
Foundry Technology
关键词
不锈钢锻件
热拉伸
裂纹
微观组织
stainless steel forging
heat tension
crack
microstructure
