Transactions of Materials and Heat Treatment

Title：Analysis and elimination measures on upsetting crack defects for as-cast Al-Mg alloy bar billet

Authors： Wang Yudi1 Fang Chao2 3 Liu Heng1 Li Baoxian1 Qi Xiaogang3 Wang Guangchun2 3

Unit： 1.Shandong Ruiye New Material Co. Ltd. 2.State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University 3. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) Shandong University

KeyWords： large ring 5083 Al-Mg alloy upsetting crack heat treatment element segregation

ClassificationCode：TG316

year,vol(issue):pagenumber：2025,50(2):1-6

Abstract：

For the cracking problem during the upsetting process of Al-Mg alloy cast bars for a large ring, through the characterization analysis on alloying elements and second-phase compounds at the crack defect, it was found that there was a significant element segregation phenomenon in the crack area with a large amount of Si and Mg elements gathered,the formed second-phase compound Mg2Si had a relatively low bonding strength with the matrix. When the deformation degree was large, the tensile stress on the outer circle of billet increased significantly, leading to the initiation of cracks in the areas with more Mg2Si phase and cracking during the process of continuous plastic deformation. The further study found that the heat treatment temperature before forging had a direct impact on the precipitation amount and morphology of Mg2Si phase. If the heating temperature before forging was raised to 540 ℃ and held for 8 h, the precipitation amount of Mg2Si phase was effectively regulated, and the occurrence of cracks during the upsetting process of as-cast Al-Mg alloy bar billets was avoided.

Funds：

山东省科技型中小企业创新能力提升工程项目(2022TSGC2122)；山东省高端铝制造与应用创新创业共同体项目（BZGDL-XM-2024-02）；国家自然科学基金资助项目（52475371）

作者简介：王玉弟（1969-），男，硕士，高级工程师，E-mail：wangydjn@126.com；通信作者：王广春（1966-），男，博士，教授，E-mail：wgc@sdu.edu.cn

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