锻件在均匀性、不能有孔隙和机械性能方面要满足严格的技术要求。因此,热成形的目的,不仅是锻出预期形状的毛坯,而且要把铸态组织尽可能压实,以消除任何孔隙。但是,如果得到足够成形性的条件已知,这个压实的任务就可以只由热成形来完成。已经有150种以上适合于制造锻件的商业用钢和实验用钢做过热拉伸试验,试验的目的是确定各种影响热 Forgings in the uniformity, can not have porosity and mechanical properties to meet the strict technical requirements. Therefore, the purpose of thermoforming is not only to forgive the blank of the desired shape but also to compact the as-cast structure as much as possible to eliminate any porosity. However, if the conditions for adequate formability are known, this compacting task can be done only by thermoforming. There are already over 150 over-heat tensile tests for more than 150 commercial and experimental steels suitable for the production of forgings. The purpose of this test is to determine the various effects of heat