(1. 上海交通大學(xué) 上海市激光制造與材料改性重點(diǎn)實(shí)驗(yàn)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(kāi)發(fā)與應(yīng)用技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室（寶鋼），上海 201900；
4. 高新船舶與深海開(kāi)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(zhǎng)短、材料吸收率高的特點(diǎn)，在高反射材料焊接中具有廣闊的應(yīng)用。采用光纖激光實(shí)現(xiàn)6016鋁合金薄板的焊接，并通過(guò)人工時(shí)效處理提高焊接接頭的力學(xué)性能。結(jié)果表明：(180 ℃, 10 h)人工時(shí)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(qiáng)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(qiáng)化相，促使接頭力學(xué)性能提高。但是，接頭焊縫區(qū)快速凝固組織特性會(huì)影響時(shí)效強(qiáng)化效果，導(dǎo)致焊縫區(qū)力學(xué)性能的提高效果要低于母材。
關(guān)鍵字: 6016鋁合金；光纖激光焊接；力學(xué)性能；時(shí)效；強(qiáng)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
