不同焊后热处理对AA7003铝合金焊接强度及抗应力腐蚀性能的影响
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摘要
对AA7003铝合金实施了无丝和填充焊丝两种钨极氩弧焊(gas tungsten arc welding, GTAW),并分别进行了焊后AA、T6、T73和RRA热处理,研究了焊丝和热处理对焊缝抗拉强度和抗应力腐蚀性能的影响。结果表明,焊丝中的Zn、Mg和Mn具有析出强化和弥散强化作用,有利于提高焊缝抗拉强度,却降低了抗应力腐蚀性能。焊后热处理工艺影响焊缝抗拉强度和抗应力腐蚀性能,填充焊丝焊缝抗拉强度依次为T6>RRA>T73>AA,应力腐蚀寿命依次为T73>RRA>AA>T6,其中RRA热处理焊缝综合性能最佳。
Two kinds of gas tungsten arc welding(GTAW) without and with filler wire were conducted on AA7003 aluminum alloy respectively, AA, T6, T73 and RRA post weld heat treatments were also carried out. The effects of welding wire and post weld heat treatment on the tensile strength and stress corrosion resistance of the weld were studied. The results show that Zn, Mg and Mn in the welding wire exert the effect of precipitation strengthening and dispersion strengthening,which can improve the tensile strength of the weld but reduce the stress corrosion resistance. The tensile strength and stress corrosion resistance of the weld are affected by post weld heat treatment. The tensile strength order of the weld with filler wire from large to small is T6>RRA>T73>AA, and the stress corrosion life order of the weld with filler wire from long to short is T73>RRA>AA>T6. The comprehensive performance of the RRA heat treated weld is the best.
Two kinds of gas tungsten arc welding(GTAW) without and with filler wire were conducted on AA7003 aluminum alloy respectively, AA, T6, T73 and RRA post weld heat treatments were also carried out. The effects of welding wire and post weld heat treatment on the tensile strength and stress corrosion resistance of the weld were studied. The results show that Zn, Mg and Mn in the welding wire exert the effect of precipitation strengthening and dispersion strengthening,which can improve the tensile strength of the weld but reduce the stress corrosion resistance. The tensile strength and stress corrosion resistance of the weld are affected by post weld heat treatment. The tensile strength order of the weld with filler wire from large to small is T6>RRA>T73>AA, and the stress corrosion life order of the weld with filler wire from long to short is T73>RRA>AA>T6. The comprehensive performance of the RRA heat treated weld is the best.
引文
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[3]杨大伟,陈树海,黄继华,等.6005A铝合金激光-TIG复合热源填丝焊接技术[J].焊接学报,2017,38(10):51-54.
[4]周士朝,朱浩,赵熠朋,等.5086铝合金CMT焊接接头微观组织及力学性能研究[J].热加工工艺,2017,46(21):35-37.
[5]石康柠,曹益,梁志敏.6N01铝合金焊接接头软化现象分析[J].热加工工艺, 2017, 46(21):185-188.
[6]侯泽北,程龙岷,刘强,等.不同焊后热处理对7005铝合金焊接接头组织性能的影响[J].热加工工艺,2016,45(15):52-55.
[7] Standard practice for preparation and use of bent-beam stress-corrosion test specimens:ASTM-G39-99[S].ASTM,2011.
[8] Dong S P, Nam S W. Effects of manganese dispersoid on the mechanical properties in Al-Zn-Mg alloys[J].Journal of Materials Science, 1995, 30(5):1313-1320.
[9]李航,魏兵,许征兵,等. Er对Al-Zn-In合金组织和电化学性能的影响[J].稀有金属材料与工程,2016,45(7):1848-1854.
[10]王培吉,陈康华,姜慧丽,等. 7003铝合金TIG焊焊接接头的组织与性能[J].粉末冶金材料科学与工程, 2016, 21(6):832-839.
[11]董春林,张坤,栾国红,等.自然时效对7050铝合金搅拌摩擦焊接头性能的影响[J].焊接学报,2014(4):15-18.
[12]张琦,李荻. LC4铝合金晶间腐蚀电化学机理[J].材料保护,1996(8):6-8.
[13] Robinson J S, Flynn P. The effects of thermal treatments on the stress corrosoin cracking resistance of forgings of the aluminium alloy 7010[J]. Key Engineering Materials, 1995, 99-100(28):143-150.
[14] Danh N C, Rajan K, Wallace W. A TEM study of microstructural changes during retrogression and reaging in7075 aluminum[J].Metallurgical Transactions A, 2011, 14(9):1843-1850.