Transactions of Materials and Heat Treatment

Title：Research on the cavity defect closure of hollow ingot

Authors： Wang Qingxin Guo Fengwei Li Sijia Tian Jihong Liu Jiansheng

Unit： Materials Science and Engineering Institute Taiyuan University of Science and Technology

KeyWords： hollow ingot numerical simulation cavity closure

ClassificationCode：

year,vol(issue):pagenumber：2014,39(10):9-14

Abstract：

During the forging of large cylinder, the production using hollow steel ingot has the advantages of less segregation, higher material utilization rate, shorter production cycle and lower energy consumption compared with the traditional process. Both the inside and outside are cooling at the same time when hollow steel ingot is casted, and the position of the final solidification location is about the middle of the hollow steel ingot, while one of the main defects is cavity defect there. With the numerical simulation software of Deform-3D,the deformation effect and influence law were studied including upsetting, drawing and enlarging in the process of hollow ingots spherical，radial, axial and tangential cavity defect closure. Under 40% deformation of upsetting，the radial cavity defect could be closed but the axial cavity defect could not, and the experimental verifications for radial and axial cavity defects closure were done. The research shows that drawing or enlarging can be conducted directly without upsetting for the hollow steel ingot blocking process,which avoids the generation of cavity defect.

Funds：

山西省自然科学基金资助项目（2013011022-3）；山西省研究生优秀创新项目（20123101）；山西省2013年国家级&省级大学生创新创业训练计划项目（201310109004，2013232）；太原科技大学大学生创新创业训练项目（xj2012021,xj2013072）

王庆辛（1987-），男，硕士研究生

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