Transactions of Materials and Heat Treatment

Title：Research on pre-aging treatment of 6016 automotive aluminum sheet

Authors： Ge Lili Li Yongbing Lu Xing Zhou Yongsong Guo Yanwei

Unit： Dalian Jiaotong University Advanced Manufacture University of Science and Technology Beijing

KeyWords： 6016 aluminum alloy natural ageing pre-ageing bake-hardening

ClassificationCode：

year,vol(issue):pagenumber：2014,39(1):113-117

Abstract：

The pre-ageing process was investigated to study the bake-hardening proeperty of 6016 automotive aluminum sheet. The results show that the pre-ageing process could siginifically improve the alloy softening phenomennion during artificial aging. The sheet hardness value after pre-ageing treatment (160 ℃/7 min)is higher than that of the T4 state and shows an increasing trendency,which effectively offsets the alloy softening phenomenion during the natural aging state.Differential scanning calorimetry test results indicate that the precipation rate of Mg2Si is accelerate by the pre-ageing treatment, which improves the effect of atificial ageing. The results of tensile test shows that the yield strength of pre-aged paint bake materials reaches 321 MPa, which is 60 MPa higher than that of the natural aging paint bake and reduces the effect of natural ageing to the sheet bake-hardening property. The optimal process of solution hardening +pre-ageing+ bake-hardening is beneficial to gain better formability and bake hardening effect for the 6016 aluminum sheet.

Funds：

国家科技重大专项“高档数控机床与基础制造装备”：精密塑性成形技术与装备创新能力平台建设（2011ZX04016-051）

葛丽丽(1987-),女, 硕士研究生

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