【摘要】：對大型軋機(jī)支承輥進(jìn)行斷裂失效分析,發(fā)現(xiàn)心部偏析和組織不均勻以及由此造成的殘余應(yīng)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(jìn)行數(shù)值模擬,分析原鍛后熱處理工藝中支承輥的溫度場、應(yīng)力場和組織場,發(fā)現(xiàn)支承輥心部熱處理過程中奧氏體化保溫時(shí)間少、空冷后入爐溫度低,正火后殘余應(yīng)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(shí)間至30 h,提高入爐溫度的優(yōu)化鍛后熱處理工藝。研究結(jié)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(shí)間不足,并降低了熱處理殘余應(yīng)力和斷裂風(fēng)險(xiǎn)。
[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