期刊文献+

T6态7A09铝合金搅拌摩擦焊接接头的疲劳性能及组织 被引量:3

Fatigue Property and Microstructure of FSW Joint of 7A09-T6 Aluminum Alloy
下载PDF
导出
摘要 用搅拌摩擦焊工艺对T6态7A09铝合金进行了焊接,用程控高频万能疲劳试验机测试了不同工艺焊接接头的疲劳性能,并得出S-N曲线,用光学显微镜及扫描电镜对焊接接头的疲劳断口进行了研究。结果表明:应力幅值越大,焊接接头的疲劳寿命越短;焊接速度为37.5 mm.min-1时的接头疲劳寿命最高;接头断裂位置在前进边的热力影响区与焊核交界处,未发生明显的塑性变形;接头疲劳断口起裂于接头底部,在扩展区出现疲劳辉纹,瞬断区呈韧窝状,具有典型的静载撕裂特征。 The 7A09-T6 aluminum alloy was welded by the FSW.The fatigue property of joints prepared by different processes was tested by high frequency fatigue testing machine and the S-N curves were obtained.In addition,the fatigue fracture of welding joints were studied by OM and SEM.The results show that fatigue life was shorter with the increase of the stress amplitude,and the fatigue life of welded joints was the longest when welding speed was 37.5 mm·min-1.The fracture of the joints was located in the juncture of the heat affected zone and the nugget,the obvious plastic deformation was not found in this area.Moreover,the joints fatigue fracture existed at the bottom of the welding sample and the fatigue striations were found in expansion area,the instantaneous break area showed a dimple morphology.All of the above were the typical tear characteristics of static load.
出处 《机械工程材料》 CAS CSCD 北大核心 2011年第5期55-58,共4页 Materials For Mechanical Engineering
关键词 7A09铝合金 T6热处理 搅拌摩擦焊 焊接接头 疲劳性能 7A09 aluminum alloy T6 heat treatment FSW welded joint fatigue property
  • 相关文献

参考文献6

  • 1《中国航空材料手册》编辑委员会.中国航空材料手册:合金镁合金[M].北京:中国标准出版社,2001:308-323.
  • 2栾国红,柴鹏,孙成彬,李辉.飞机制造的前景技术——搅拌摩擦焊[J].航空制造技术,2004,47(11):44-47. 被引量:14
  • 3JOHN R, JATA K V, SANDANANDA K. Residual stress effects on near-threshold fatigue crack growth in friction stir welds in aerospace alloys[J]. International Journal of Fatigue, 2003,25 : 939-948.
  • 4SHARMA S R, MA Z Y, MISHRA R S. Effect of friction stir processing on fatigue behavior of A356 alloy[J]. Seripta Materialia, 2004,51 : 237-241.
  • 5NJAMES M, HATTINGH D G, BRADLEY G R. Weld tool travel speed effects on fatigue life of friction stir welds in 5083 aluminum[J]. International Journal of Fatigue, 2003,25 : 1389- 1398.
  • 6BUSSU G E, IRVING P. The role of residual stress and heat affect zone properties on fatigue crack propagation in friction stir welded 2024-T351 [J]. International Journal of Fatigue, 2003,25 : 77-78.

共引文献13

同被引文献28

引证文献3

二级引证文献7

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部