(1. 上海交通大學 上海市激光制造與材料改性重點實驗室，上海 200240；
2. 寶山鋼鐵股份有限公司 研究院，上海 201900；
3. 汽車用鋼開發(fā)與應用技術國家重點實驗室（寶鋼），上海 201900；
4. 高新船舶與深海開發(fā)裝備協(xié)同創(chuàng)新中心，上海 200240)
摘 要: 光纖激光因其波長短、材料吸收率高的特點，在高反射材料焊接中具有廣闊的應用。采用光纖激光實現(xiàn)6016鋁合金薄板的焊接，并通過人工時效處理提高焊接接頭的力學性能。結果表明：(180 ℃, 10 h)人工時效處理工藝可以將焊縫中心硬度由67 HV提高到84 HV，焊接接頭拉伸強度由185 MPa提高到274 MPa。6016鋁合金接頭在α(Al)基體中析出大量納米尺度的β強化相，促使接頭力學性能提高。但是，接頭焊縫區(qū)快速凝固組織特性會影響時效強化效果，導致焊縫區(qū)力學性能的提高效果要低于母材。
關鍵字: 6016鋁合金；光纖激光焊接；力學性能；時效；強化相
（1. Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240, China;
2. Research Institute, Baoshan Iron & Steel Co., Ltd., Shanghai 201900, China;
3. State Key Laboratory of Development and Application Technology of Automotive Steels, Shanghai 201900, China;
4. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China）
Abstract:The fiber laser is widely used in the welding process of the high-reflectivity material for its short wavelength and resultant high absorptivity to those materials. The fiber laser welding was applied to join 6016 aluminum sheets and a postal aging treatment was employed to improve the mechanical properties of the joint. The research results show that the aging treatment of (180 ℃, 10 h) increases the hardness of the joint from 67 HV to 84 HV, and tensile strength from 185 MPa to 274 MPa. The microstructural observation shows the a large number of β″ strengthening phase particles in nano-scale size precipitate from α(Al) phase and improves the mechanical property of the joint. However, the rapid solidification microstructure in the fusion zone has a negative influence on the strengthening of aging treatment. The increase degree of mechanical property in fusion zone is lower than that in base metal zone.
Key words: 6016 aluminum alloys; fiber laser welding; mechanical properties; aging process; strengthening phase
