汽车用6061-T6板材高强度高延伸率工艺研究  

Study on high strength and high elongation technology of 6061-T6 plate for automobile

作　　者：滕明和 伍彬 袁圣 杨光禧 Teng Minghe;Wu Bin;Yuan Sheng;Yang Guangxi(Southwest Aluminum(Group)Co.,Ltd.,Chongqing 401326,China)

机构地区：[1]西南铝业(集团)有限责任公司,重庆401326

出　　处：《铝加工》2022年第5期29-34,共6页Aluminium Fabrication

摘　　要：为满足汽车轻量化的性能要求,通过对汽车用6061-T6薄板中主要合金元素Si、Mg含量的优化,试验了4种不同主合金元素配比方案。在气垫式热处理炉内快速加热、保温及固溶的条件下,获得最佳的MgSi溶解度,并通过时效工艺探索,确定在最佳固溶条件下4种方案的力学性能变化趋势。结合电子显微镜OM和扫描电镜SEM对时效样品进行观察,发现Si含量在0.7%、Mg含量在0.9%左右的配比方案下,其时效组织中存在过剩Si。进一步对时效析出的强化相Mg_(2)Si质点进行细化,可以获得高强度组织。研究表明,采用这种成分方案,在最佳的固溶及时效工艺条件下,可实现力学性能抗拉强度≥320 MPa,屈服强度≥290 MPa,延伸率≥13.5%的高强高延伸的指标要求。In order to meet the requirement of lightweight for automobile, the high strength and high elongation sheet 6061T6 for automobile was obtained. The maximum strengthening effect of MgSi phase was achieved by optimizing the content of main alloy elements Si and Mg of 6061. Under the conditions of rapid heating, heat preservation and solid solution in air cushion heat treatment furnace, the optimum solubility of MgSi was obtained with four different master alloy element ratio schemes, and the aging process was explored, the change trend of mechanical properties of the four schemes was determined under the optimum solid solution condition.The aging samples were observed by SEM and OM. It was found that there was excess Si in the aging microstructure with Si content about 0.7% and Mg content about 0.9%, the Mg_(2)Si particles were further refined to obtain high strength microstructure. The results show that high strength and high elongation can be achieved under the optimum solution and aging conditions, and the mechanical properties Rm ≥320MPa, σ≥290MPa, δ≥13.5% can be achieved by the above composition scheme.

关 键 词：汽车用铝材 6061-T6板材 高强高延伸 气垫式热处理炉 固溶处理 时效处理 

分 类 号：TG166.3[金属学及工艺—热处理] TG339[金属学及工艺—金属学]