基于热处理数值分析的大型支承辊锻后热处理工艺优化

发布时间：2018-10-22 18:34

【摘要】：对大型轧机支承辊进行断裂失效分析,发现心部偏析和组织不均匀以及由此造成的残余应力是支承辊断裂的主要原因。利用Deform有限元软件对该支承辊锻后热处理工艺进行数值模拟,分析原锻后热处理工艺中支承辊的温度场、应力场和组织场,发现支承辊心部热处理过程中奥氏体化保温时间少、空冷后入炉温度低,正火后残余应力过大。提出降低加热速度为10℃·h~(-1),提高完全奥氏体保温温度为930℃和延长保温时间至30 h,提高入炉温度的优化锻后热处理工艺。研究结果表明:采用优化工艺可以解决支承辊心部完全奥氏体化保温时间不足,并降低了热处理残余应力和断裂风险。
[Abstract]:The fracture failure analysis of the back-up roll of large rolling mill shows that the core segregation and non-uniform structure and the residual stress caused by it are the main reasons for the fracture of the back-up roll. Deform finite element software was used to simulate the post-forging heat treatment process of the back-up roll. The temperature field, stress field and microstructure field of the back-up roll in the original post-forging heat treatment process were analyzed. It was found that the austenitizing heat preservation time of the back-up roll core heat treatment process was less. The temperature of air-cooled furnace is low and the residual stress after normalizing is too large. The optimum post-forging heat treatment process is put forward, which can reduce the heating rate by 10 鈩，

本文编号：2287977