【摘要】：對大型軋機支承輥進行斷裂失效分析,發(fā)現心部偏析和組織不均勻以及由此造成的殘余應力是支承輥斷裂的主要原因。利用Deform有限元軟件對該支承輥鍛后熱處理工藝進行數值模擬,分析原鍛后熱處理工藝中支承輥的溫度場、應力場和組織場,發(fā)現支承輥心部熱處理過程中奧氏體化保溫時間少、空冷后入爐溫度低,正火后殘余應力過大。提出降低加熱速度為10℃·h~(-1),提高完全奧氏體保溫溫度為930℃和延長保溫時間至30 h,提高入爐溫度的優(yōu)化鍛后熱處理工藝。研究結果表明:采用優(yōu)化工藝可以解決支承輥心部完全奧氏體化保溫時間不足,并降低了熱處理殘余應力和斷裂風險。
[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，

本文編號：2287977