摘要
通过金相、扫描电镜观察和能谱分析,对1Cr18Mn18N不锈钢热锻过程中的开裂原因进行了分析和探究。金相观察发现,在奥氏体晶界上出现过烧痕迹,以及部分偏析和沿晶界扩展的贯穿裂纹;通过扫描电镜并结合能谱分析发现,在晶界处有硫化物形成和熔化的痕迹,在晶粒内有Al2O3、Ca CO3夹杂,并在开裂位置有大量Mn元素的偏聚。结果表明,钢件在热锻过程中开裂的主要原因是锻件存在冶金缺陷,它导致工件在高温下发生开裂。
The cracking cause of stainless steel 1Cr18Mn18N during hot forging was analyzed and studied by metallography, SEM and energy spectrum analysis. After metallographic observation, the overburning traces in the austenite grain boundaries and part of segregation and through crack along grain boundaries extending were found. Combined with energy spectrum analysis, through SEM, it was found that there were sulfides and melting trace in the grain boundaries, there were impurities of Al2O3 and CaCO3 within the grain, and there were a large number of Mn element segregation in the cracking position. The results show that the main causes of steel cracking are metallurgical defects in the forging during the hot forging process, which leads to workpieces cracking at high temperature.
出处
《热加工工艺》
CSCD
北大核心
2015年第13期238-240,共3页
Hot Working Technology
