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Fe-Al金属间化合物对铝/钢钎焊接头力学性能的影响 被引量:9
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作者 张满 张军 +4 位作者 蒋腾 张临财 杨大春 侯宇 吴静 《焊接学报》 EI CAS CSCD 北大核心 2018年第1期61-64,共4页
研究了Zn-Al钎料钎焊铝/钢接头的铺展性能、钎焊接头力学性能与显微组织.铺展试验结果表明,随着钎料中铝含量的增加,钎料在3003铝合金、Q235钢表面的铺展面积均增大,铝含量为15%(质量分数)时,在3003铝合金与Q235钢表面的铺展面积均达到... 研究了Zn-Al钎料钎焊铝/钢接头的铺展性能、钎焊接头力学性能与显微组织.铺展试验结果表明,随着钎料中铝含量的增加,钎料在3003铝合金、Q235钢表面的铺展面积均增大,铝含量为15%(质量分数)时,在3003铝合金与Q235钢表面的铺展面积均达到最大值,继续增加铝含量,钎料铺展性能降低.钎焊接头力学性能试验结果表明,随着钎料中铝含量的增加,钎焊接头强度提高,铝含量为12%(质量分数)时,88Zn-12Al钎料铝/钢钎焊接头强度最高,继续增加铝含量,钎焊接头强度降低.综合考虑铺展性能及接头力学性能,88Zn-12Al钎料钎焊铝/钢接头性能最佳. 展开更多
关键词 ZN-AL钎料 铝/钢钎焊 铺展性能 力学性能 显微组织
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铝/钢异种材料钎焊研究现状与发展趋势 被引量:8
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作者 吴杰 薛松柏 +2 位作者 费文潘 韩翼龙 张鹏 《材料导报》 EI CAS CSCD 北大核心 2019年第21期3533-3540,共8页
“低碳环保,节能减排”已经成为国家实现可持续发展的重要环节,而如何实现汽车轻量化、减少温室气体的排放则成为汽车行业的前沿课题。采用高强度铝合金材料部分代替结构钢,是减轻汽车质量的一种有效途径,而铝合金与钢之间焊接接头的质... “低碳环保,节能减排”已经成为国家实现可持续发展的重要环节,而如何实现汽车轻量化、减少温室气体的排放则成为汽车行业的前沿课题。采用高强度铝合金材料部分代替结构钢,是减轻汽车质量的一种有效途径,而铝合金与钢之间焊接接头的质量是衡量铝/钢结构可靠性的重要指标。实现铝合金与钢之间可靠连接的主要难点是两种材料的物理化学性能差异很大,常温下两者几乎不互溶,且容易发生反应生成Fe-Al脆性金属间化合物,严重影响铝/钢焊接接头的质量。而铝合金与钢的钎焊可通过调节钎料成分或改变焊接工艺等方法来控制接头脆性金属间化合物的形成,近年来受到了国内外学者的广泛关注并取得了突破性进展。目前,铝/钢钎焊的研究主要集中在钎焊材料改性和钎焊工艺优化两个方面。钎剂的改性就是向Nocolok钎剂中加入活性剂,增强钎剂对铝合金和不锈钢两种材料表面氧化膜的同时去除作用,改善钎料在母材上的润湿性;钎料的改性主要是通过微合金化的方法向钎料中添加微量的合金元素,通过改变钎料的化学成分来改善钎料基体的组织和性能,近年来取得了大量的研究成果并在工业生产中得到广泛应用,如添加Cu、Ag等元素均可以显著改善钎料的力学性能和可靠性。在钎焊工艺方面,钎焊温度和保温时间直接影响钎料的填缝和钎料与母材的相互作用,并决定钎焊接头的质量。除此之外,在不锈钢表面预镀一层中间相也是相关学者研究的重点课题,镀层金属可以限制Fe原子与钎料中Al原子的相互扩散,降低界面脆性金属间化合物层的厚度,从而提高钎焊接头的力学性能。本文综合评述了铝与钢异种材料钎焊的研究进展。首先介绍了铝合金与钢常用的几种钎焊方法,以及每种钎焊方法各自的特点和应用范围;然后综述了钎焊材料的改性及钎焊工艺的优化对铝/钢钎焊接头性能的影响,并对其作用机理进行了分析;最后整理了目前铝/钢异种金属钎焊存在的问题及相应的解决措施,并对其未来的研究和发展趋势进行了展望,以期为铝/钢连接技术的发展以及最终在汽车行业的广泛应用提供有益的参考。 展开更多
关键词 铝/钢钎焊 钎料 工艺 显微组织 力学性能
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Contact reactive brazing of Al alloy/Cu/stainless steel joints and dissolution behaviors of interlayer 被引量:10
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作者 吴铭方 司乃潮 陈健 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第5期1035-1039,共5页
Contact reactive brazing of 6063 Al alloy and 1Cr18Ni9Ti stainless steel was researched by using Cu as interlayer. Effect of brazing time on microstructure of the joints, as well as the dissolution behaviors of Cu int... Contact reactive brazing of 6063 Al alloy and 1Cr18Ni9Ti stainless steel was researched by using Cu as interlayer. Effect of brazing time on microstructure of the joints, as well as the dissolution behaviors of Cu interlayer was analyzed. The results show that the product of reaction zone near 1Cr18Ni9Ti is composed of Fe2Al5, FeAl3 intermetallic compound (IMC), and Cu-Al IMC; the near by area is composed of Al-Cu eutectic structure with Al (Cu) solid solution. With increasing the brazing time, the thickness of IMC layer at the interface increases, while the width of Al-Cu eutectic structure with Al(Cu) solution decreases. Calculation shows the dissolution rate of Cu interlayer is very fast. The complete dissolution time is about 0.47 s for Cu interlayer with 10 μm in thickness used in this study. 展开更多
关键词 Al alloy stainless steel contact reactive brazing MICROSTRUCTURE dissolution of interlayer
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Residual stress and welding distortion of Al/steel butt joint by arc-assisted laser welding-brazing 被引量:11
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作者 Chun-ling LI Ding FAN +1 位作者 Xiao-quan YU Jian-kang HUANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第4期692-700,共9页
The thermo-elastic.plastic finite element method(FEM)is used to simulate the thermo-mechanical behavior of Al/steel tungsten inert gas(TIG)arc-assisted laser welding-brazing(A-LWB)butt joint.The influence of material ... The thermo-elastic.plastic finite element method(FEM)is used to simulate the thermo-mechanical behavior of Al/steel tungsten inert gas(TIG)arc-assisted laser welding-brazing(A-LWB)butt joint.The influence of material nonlinearity,geometrical nonlinearity and work hardening on the welding process is studied,and the differences in the welding temperature field,residual stress and welding distortion by A-LWB and by single laser welding-brazing(SLWB)are analyzed.The results show that the thermal cycle,residual stress distribution and welding distortion by the numerical simulation are in good agreement with the measured data by experiments,which verifies the effectiveness of FEM.Compared with the SLWB,A-LWB can make the high-temperature distribution zone of weld in width direction wider,decrease the transverse tensile stress in the weld and reduce the distribution range of longitudinal tensile stress.And the welding deformation also decreases to some extent. 展开更多
关键词 arc-assisted laser welding-brazing(A-LWB) Al/steel finite element method(FEM) temperature field residual stress welding distortion
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Effect of Mg and Si on intermetallic formation and fracture behavior of pure aluminum-galvanized carbon-steel joints made by weld-brazing 被引量:1
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作者 A.ALIKHANI R.BEYGI +2 位作者 M.ZAREZADEH MEHRIZI F.NEMATZADEH I.GALVÃO 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第11期3626-3638,共13页
Commercial pure aluminum and galvanized carbon steel were lap-welded using the weld-brazing(WB)technique.Three types of aluminum filler materials(4043,4047,and 5356) were used for WB.The joint strength and intermetall... Commercial pure aluminum and galvanized carbon steel were lap-welded using the weld-brazing(WB)technique.Three types of aluminum filler materials(4043,4047,and 5356) were used for WB.The joint strength and intermetallic compounds at the interface of three series of samples were analyzed and compared.Depending on the Si content,a variety of ternary Al-Fe-Si intermetallic compounds(IMCs) such as Fe_(4)(Al,Si)_(13),Fe_(2) Al_(8) Si(τ_(5)),and Fe_(2) Al_(9) Si_(2)(τ_(6)) were formed at the interface.Mg element in 5356 filler material cannot contribute to the formation of Al-Fe intermetallic phases due to the positive mixing enthalpy of Mg-Fe.The presence of Mg enhances the hot cracking phenomenon near the Al-Fe intermetallic compound at the interface.Zn coating does not participate in intermetallic formation due to its evaporation during WB.It was concluded that the softening of the base metal in the heat-affected zone rather than the IMCs determines the joint efficiency. 展开更多
关键词 weld-brazing Al-steel ternary Al-Fe intermetallic joint efficiency hot cracking
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Improving pulsed laser weldability of duplex stainless steel to 5456 aluminum alloy via friction stir process reinforcing of aluminum by BNi-2 brazing alloy 被引量:6
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作者 Hossein ESMAILY Ali HABIBOLAHZADEH Mohammad TAJALLY 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第7期1401-1412,共12页
Effects of laser pulse distance and reinforcing of 5456 aluminum alloy were investigated on laser weldability of Al alloy to duplex stainless steel (DSS) plates. The aluminum alloy plate was reinforced by nickel-base ... Effects of laser pulse distance and reinforcing of 5456 aluminum alloy were investigated on laser weldability of Al alloy to duplex stainless steel (DSS) plates. The aluminum alloy plate was reinforced by nickel-base BNi-2 brazing powder via friction stir processing. The DSS plates were laser welded to the Al5456/BNi-2 composite and also to the Al5456 alloy plates. The welding zones were studied by scanning electron microscopy, X-ray diffractometry, micro-hardness and shear tests. The weld interface layer became thinner from 23 to 5 μm, as the laser pulse distance was increased from 0.2 to 0.5 mm. Reinforcing of the Al alloy modified the phases at interface layer from Al-Fe intermetallic compounds (IMCs) in the DSS/Al alloy weld, to Al-Ni-Fe IMCs in the DSS/Al composite one, since more nickel was injected in the weld pool by BNi-2 reinforcements. This led to a remarkable reduction in crack tendency of the welds and decreased the hardness of the interface layer from ~950 HV to ~600 HV. Shear strengths of the DSS/Al composite welds were significantly increased by ~150%, from 46 to 114 MPa, in comparison to the DSS/Al alloy ones. 展开更多
关键词 duplex stainless steel (DSS) Al5456 aluminum alloy BNi-2 brazing alloy friction stir processing pulsed laser welding
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