区域偏析是一种常见的冶金缺陷,它会导致锻造缺陷。以某公司生产的超大型核电管板为研究对象,综合利用matlab、Deform和Hypermesh软件对核电管板镦粗成形中偏析缺陷进行了数值模拟,从金属塑性成形力学的角度对偏析缺陷进行了定性分析。结果表明:锥板镦粗开始阶段是锻造裂纹产生和扩展的危险阶段。最后提出了预防和减小偏析缺陷的措施。 Segregation is a common metallurgical defect that can lead to forging defects. Taking a super-large nuclear tube plate produced by a company as the research object, the numerical simulation of the segregation defects in the upsetting of the nuclear tube sheet was carried out by using matlab, Deform and Hypermesh software synthetically. The segregation defect was qualitatively analyzed from the aspect of metal plastic forming mechanics analysis. The results show that the initial stage of upsetting cone plate is the dangerous phase of forging crack growth and expansion. Finally, measures to prevent and reduce segregation defects were proposed.