研究了铝合金2024-T4搅拌摩擦焊(FSW)搭接接头的微观组织特征和疲劳性能.结果表明,搭接接头后退侧热力影响区晶粒变形程度较前进侧严重.疲劳试样断裂位置均位于弱连接缺陷向上“拉起”较严重的焊核区后退侧.当应力比为0.1时,铝合金搅拌摩擦焊搭接接头对应于95％存活率的疲劳强度特征值(A)(o)k为18.25MPa,与铝合金熔焊搭接接头的(A)(o)k为13.92MPa相比,增加了31.11％.与此同时,FSW搭接接头疲劳S-N曲线斜率m为5.39,大于熔焊接头所对应的S-N曲线斜率范围3.0-3.5,可见在长寿命区搭接接头的疲劳性能优于熔焊接头.搭接接头的裂纹源位于搭接接头上板底部位置的表面缺陷或者强化相颗粒处,对应于弱连接缺陷处.
参考文献
| [1] | THOMAS W M;NICHOLAS E D;NEEDHAM J C et al.Friction stir welding[P].International Patent Application No.PCT/ GB92102203,1991. |
| [2] | DUBOURG L;MERATI A;JAHAZI M .Process optimization and mechanical properties of friction stir lap welds of 7075-T6 stringers on 2024-T3 skin[J].Materials & Design,2010,31:3324-3330. |
| [3] | FERSINI D;PIRONDI A .Fatigue behavior of Al2024-T3friction stir welded lap joints[J].Engineering Fracture Mechanics,2007,74:468-480. |
| [4] | 傅志红,贺地求,周鹏展,胡爱武.7A52铝合金搅拌摩擦焊焊缝的组织分析[J].焊接学报,2006(05):65-68. |
| [5] | 贺幼生.7075铝合金的搅拌摩擦焊组织性能研究[J].株洲工学院学报,2006(02):56-58. |
| [6] | M. Ericsson;L.-Z. Jin;R. Sandstrom .Fatigue properties of friction stir overlap welds[J].International Journal of Fatigue,2007(1):57-68. |
| [7] | WANG Xijing,牛勇,ZHANG Jie,李树伟,XU Cheng.2024铝合金搅拌摩擦焊接头的疲劳性能[J].热加工工艺,2008(15):4-5,9. |
| [8] | OOSTERKAMP A;OOSTERKAMP L D;NORIEIDE A .Kissing bond phenomena in solid-state welds of aluminum alloys[J].Welding Journal,2004,83:225s-231s. |
| [9] | CEDERQVIST L;REYNOLDS A P.Factors affected the properties of friction stir welded aluminum overlap joints[J].Welding Journal (Res Supplement),2001:281-287. |
| [10] | G. Madhusudhan Reddy;P. Mastanaiah;K. Sata Prasad .Microstructure and mechanical property correlations in AA 6061 aluminium alloy friction stir welds[J].Transactions of the Indian Institute of Metals,2009(1):49-58. |
| [11] | 栾国红,郭德伦,张田仓,孙成彬.铝合金的搅拌摩擦焊[J].焊接技术,2003(01):1-4. |
| [12] | Mishra RS;Ma ZY .Friction stir welding and processing[J].Materials Science & Engineering, R. Reports: A Review Journal,2005(1/2):III-0. |
| [13] | 杨新岐,栾国红,许海生,柴鹏.铝合金搅拌摩擦与MIG焊接接头疲劳性能对比试验[J].焊接学报,2006(04):1-4. |
| [14] | PARTMLEN T;NIEMI E .Hot spot S-N curves based on fatigue tests of small MIG-welded aluminum specimens[J].Welding in the Wodd,1999,43(01):16-22. |
| [15] | HOBBACHER .Recommendations for Fatigue Design of Welded Joints and Components,IIW document ex XⅢ-2151r4-07/XV-1254r4-07[Z].Update,2008. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%