Transactions of Materials and Heat Treatment

Title：Simulation analysis and research on integral forming process of profiled forgings for nuclear power

Authors： Zhang Shaojun Liu Zhao Zhao Donghai Liang Shuhua

Unit： Equipment Supervision Research Center Suzhou Nuclear Power Research Institute Co. Ltd.

KeyWords： integral head forging Forge forging simulation software deformation temperature stress equivalent strain

ClassificationCode：TG316.2

year,vol(issue):pagenumber：2017,42(4):14-20

Abstract：

In order to study the integral forming process of profiled forgings for nuclear power plant, a numerical simulation of hot forming process for integral head forging was carried out by France Forge simulation software. The results show that the radial and axial stress extreme values happen at the later forming stage, and the maximum radial stress of 118.2 MPa and the strain of 1.05 appear on the inner surface of head dome (spherical). Meanwhile, the maximum axial stress of 30.6 MPa and the strain of 1.63 appear near the inner wall of the connection transition zone and the head dome. According to Cockcroft & Latham fracture criterion, the risk of cracking exists at the above positions. After the upper die being optimized locally, the simulation results show that the distributions of stress and strain at the above dangerous positions are improved. Therefore, the fillet of the upper die edge region is one of the important parameters and has a certain influence on the forging quality after forming.

Funds：

国家科技重大专项（2011ZX06004-002)

张绍军（1981-），男，硕士，高级工程师 E-mail：zhangshaojun1020@163.com

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