研究了不同温度焊后时效处理对2219铝合金变极性钨极氩弧焊（VPTIG）接头各微区显微组织的影响，采用显微硬度测试和透射电镜观察分析焊接接头各微区析出相的形貌和分布。结果表明，焊后时效处理温度不同，焊接接头各微区显微组织和硬度发生的变化不同。热影响区中的完全回复区对焊后时效最为敏感，低温处理时显微硬度就有明显增长，并在160℃处理时达到最大涨幅；焊缝区变化相对较小，其显微硬度的最高涨幅出现在210℃，且小于前者；热影响区中的过时效区最为稳定，显微硬度的最大增长同样出现在160℃，但涨幅很小。透射电镜观察表明，焊接接头各微区的显微硬度变化主要与时效强化相的析出行为有关。
The effects of post-weld aging treatment on microstructure and micro-hardness of aluminum alloy grade 2219 welds are pres-ented.The microstructure including the precipitates distribution and morphology was observed by transmission electron microscopy (TEM)and micro-hardness was measured to characterize the different micro-areas across the weld.The results show that different post-weld aging temperatures lead to variations in microstructure and micro-hardness across the weld.Full reversion area (RA)in the heat affected zone (HAZ)is the most sensitive to the aging process.Micro-hardness in this area shows obvious improvement when it is pro-cessed at low aging temperatures,and the maximum increase is achieved at 160℃.The micro-hardness in the weld metal (WM)re-mains relatively stable.The maximum increase is achieved at 210℃.The over-aged area (OA)shows a very limited increase in micro-hardness and the maximum value is obtained at 160℃.TEM observation revealed that the changes in micro-hardness of micro-areas across the weld are mainly related with the precipitate evolution during the aging process.
参考文献
| [1] | VENKATA N G;SHABMA V M J;DIWAKAR V et al.Fracture behavior of aluminum alloy 2219-T87 welded plates[J].Science and Technology of Welding and Join-ing,2004,9(2):121-130. |
| [2] | SRINIVASA R P;SIVADASN K G;BALASUBRAMANI-AN P K .Structure-property correlation on AA2219 alumin-ium alloy weldments[J].Bulletin of Materials Science,1996,19(3):549-557.]. |
| [3] | ALBERTINI G;BRUNO G;DUNN B D et al.Compara-tive neutron and X-ray residual stress measurements on Al-2219 welded plate[J].Materials Science and Engineering (A),1997,224(1):157-165. |
| [4] | 彭杏娜,曲文卿,张国华.焊接方法对2219铝合金性能及组织的影响[J].航空材料学报,2009(02):57-60. |
| [5] | 刘春飞.新一代运载火箭箱体材料的选择[J].航空制造技术,2003(02):22-27. |
| [6] | 陈迎春,刘会杰,冯吉才.2219-O铝合金的搅拌摩擦焊接[J].焊接学报,2006(01):65-68. |
| [7] | CHEN Y C;LIU H J;FENG J C .Effect of post-weld heat treatment on the mechanical properties of 2219-O friction stir welded joints[J].Journal of Materials Science,2006,41(1):297-299. |
| [8] | Feng JC;Chen YC;Liu HJ .Effects of post-weld heat treatment on microstructure and mechanical properties of friction stir welded joints of 2219-O aluminium alloy[J].Materials Science and Technology: MST: A publication of the Institute of Metals,2006(1):86-90. |
| [9] | MALARVIZHI S;RAGHUKANDAN K;VISWANATHAN N .Effect of post weld aging treatment on tensile properties of electron beam welded AA2219 aluminium alloy[J].In-ternational Journal of Advanced Manufacturing Technology,2008,37(3 -4):294-301. |
| [10] | S. Malarvizhi;V. Balasubramanian .INFLUENCES OF WELDING PROCESSES AND POST-WELD AGEING TREATMENT ON MECHANICAL AND METALLURGICAL PROPERTIES OF AA2219 ALUMINIUM ALLOY JOINTS[J].Welding in the World: Journal of the International Institute of Welding: Journal of the International Institute of Welding,2012(9/10):105-119. |
| [11] | KOU S.Welding metallurgy[M].New Jersery:John Wi-ley & sons,2002:359-361. |
| [12] | 从保强,齐铂金,周兴国,罗军.219 高强铝合金超快变换 VPTIG焊缝组织和性能[J].焊接学报,2010(04):85-88. |
| [13] | Paglia CS;Buchheit RG .The time-temperature-corrosion susceptibility in a 7050-T7451 friction stir weld[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2008(1/2):250-254. |
| [14] | XU W F;LIU J H;LUAN G H .Temperature evolution,microstructure and mechanical properties of friction stir welded thick 2219-O aluminum alloy joints[J].Materials and Design,2009,30(6):1886-1893. |
| [15] | Bo Li;Yifu Shen .The investigation of abnormal particle-coarsening phenomena in friction stir repair weld of 2219-T6 aluminum alloy[J].Materials & design,2011(7):3796-3802. |
| [16] | KARLIK M;JOUFFREY B .High resolution electron mi-croscopy of Guinier-Preston (GPI)zones in Al-Cu based alloys[J].Acta Materialia,1997,45(97):3251-3263. |
| [17] | ABE T;MIYAZAKI K;HIRANO K .Imaging of pure Al and aged Al-4wt.% Cu alloys by field ion microscopy[J].ActaMetallurgica,1982,30(2):357-366. |
| [18] | PHILLIPS V A .High resolution electron microscope obser-vations on precipitation in Al-3%Cu alloy[J].Acta Metal-lurgica,1973,23(75):751-767. |
| [19] | PAPAZIAN J M .A calorimetric study of precipitation in a-luminum alloy 2219[J].Metallurgical Transactions(A),1981,12(2):269-280. |
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