Transactions of Materials and Heat Treatment

Title：Preliminary study on forming process of upper swing arm for 6082 aluminum alloy

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ClassificationCode：TG316

year,vol(issue):pagenumber：2019,44(8):66-70

Abstract：

For the problem of formation of coarse grains in hot forging and affecting the properties of 6082 aluminum alloy forgings, the grain coarsening tests under undeformed and deformed conditions were implemented by heating and holding for blank. Then, the thickness of coarse grain layer on the surface of blank was quantitatively analyzed, and the influences of heating temperature, holding time and thermal deformation conditions on coarse grain phenomenon of 6082 aluminum alloy were discussed. The results show that the coarse grain layer expands rapidly when the holding time exceeds 25 minutes. Under the deformation of 0.7, deformation temperature of 350-450 ℃ and the deformation rate of 0.1-5 s-1, the sample was compressed, and the grain size was observed by EBSD image. It is found that there are mixed crystals, and the high deformation temperature at large strain rate is beneficial to weaken the mixed crystals. According to the conclusion, three forming process schemes of automobile upper swing arm were initially worked out, and the scheme of heating the material to 540 ℃ for pre-forging and reheating to the same temperature for finish-forging is more reasonable to reduce the thickness of coarse grain layer of forgings.

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作者简介：孙田田（1992-），女，硕士研究生 E-mail：tiantian_sun@sjtu.edu.cn 通讯作者：赵震（1972-），男，博士，教授 E-mail：zzhao@sjtu.edu.cn

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