在大型热锻造中 ,除为得到所需要的形状同时 ,希望钢锭存在的疏松缺陷获得封团 ,因此对钢锭采取镦粗和拔长相结合的锻造工艺。但是 ,对缺陷如何进行封闭的行为尚不清楚 ,为此 ,日本九州公立大学采取腊泥模拟进行了试验 ,取得了结果。此次在镦粗前后两次拔长的工艺是在 1 5 0相 In large-scale hot forging, in addition to obtain the desired shape at the same time, hope that the existence of loose ingot defects obtained block, so forging and upsetting the ingot to take a combination of forging process. However, it is still not clear how the defects will be closed. To this end, Kyushu Public University in Japan conducted experiments using the slug simulation and obtained the results. The two processes before and after the upsetting process is in 150 phase