工程科学学报2016，Vol.38Issue(3)：351-356,6.DOI:10.13374/j.issn2095-9389.2016.03.008
连铸板坯轻压下过程中间裂纹产生机理
Formation mechanism of internal cracks in continuous casting slabs with soft reduction
摘要
Abstract
The crack morphology and element segregation in continuous casting slabs were studied to solve the problem of internal cracks. The stress of the solidification front was analyzed by a finite element model at a series of reduction parameters and compared with the critical value. It is found that C, P and S enrich in dendrites and exist in grain boundaries, these are just the internal causes, but the true cause for internal cracks is the tensile stress of the solidification front. When the slab passes through the straightening seg-ment, the reduction effect of rollers results in the stress of the solidification front exceeding the critical value, however, the corre-sponding stresses in the arc and horizontal segments do not exceed the critical value, so the solidification front in the straightening seg-ment would be much easy to crack. Statistics analysis shows that when soft reduction and straightening are separately carried out, the occurrence rate of internal cracks reduces by about 41. 3%.关键词
连铸/板坯/裂纹/产生机理/应力分析/显微偏析/有限元模型Key words
continuous casting/slabs/cracks/formation mechanism/stress analysis/microsegregation/finite element model分类
矿业与冶金引用本文复制引用
王博,张炯明,肖超,王顺玺,宋炜..连铸板坯轻压下过程中间裂纹产生机理[J].工程科学学报,2016,38(3):351-356,6.基金项目
国家自然科学基金资助项目(U1360201) （U1360201）
国家高技术研究发展计划资助项目(2012AA03A505) （2012AA03A505）
