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5A06铝合金焊接接头在超长寿命区间的疲劳性能

李想, 邓彩艳, 龚宝明, 王东坡

李想, 邓彩艳, 龚宝明, 王东坡. 5A06铝合金焊接接头在超长寿命区间的疲劳性能[J]. 焊接学报, 2016, 37(2): 59-62.
引用本文: 李想, 邓彩艳, 龚宝明, 王东坡. 5A06铝合金焊接接头在超长寿命区间的疲劳性能[J]. 焊接学报, 2016, 37(2): 59-62.
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LI Xiang, DENG Caiyan, GONG Baoming, WANG Dongpo. Super-long life fatigue property of 5A06 aluminum alloy welded joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2016, 37(2): 59-62.
Citation: LI Xiang, DENG Caiyan, GONG Baoming, WANG Dongpo. Super-long life fatigue property of 5A06 aluminum alloy welded joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2016, 37(2): 59-62.
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5A06铝合金焊接接头在超长寿命区间的疲劳性能

  • 天津大学 材料科学与工程学院, 天津 300072

基金项目: 国家自然科学基金资助项目(51375331)

Super-long life fatigue property of 5A06 aluminum alloy welded joint

  • School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China

摘要

    摘要
  • 摘要: 采用自行研制的TJU-HJ-I型超声疲劳试验系统对5A06铝合金TIG焊焊接接头在超长寿命区间的疲劳性能进行研究. 疲劳试验结果表明,圆柱状母材试件、圆柱状焊接接头试件和薄板状焊接接头试件,在经历107循环周次后,S-N曲线仍呈下降趋势,没有发现明显转折,传统意义上的疲劳极限并不存在. 焊接接头试件在107周次和109周次下的疲劳强度仅为母材的50%~70%. 通过扫描电子显微镜进行断口形貌观察发现:母材疲劳扩展区断口较焊接接头断口平整,瞬断区呈韧窝状,而无余高焊接接头试件存在气孔、夹杂等焊接缺陷,导致疲劳性能明显降低.
    Abstract: The super-long life fatigue properties of 5A06 aluminum alloy TIG welded joint were investigated with a self-made TJU-HJ-I ultrasonic fatigue test device. The results show that the S-N curve descended continuously for the cylindrical-shape base material specimens, cylindrical-shape welded joint specimens and thin plate welded joint specimens after 107 cycles. No obvious turning was found in the S-N curve. The fatigue strength of welded joint in 107 and 107 cycles was just 50%-70% of that of base material. The ultrasonic fatigue fracture morphology of specimens, observed with scanning electron microscope, reveals that the fracture surface in fatigue crack propagation area of base material was flatter than that of welded joint. Dimples existed in the transient rupture zone. However, welding defects like pores and inclusions were found in the welded joint without reinforcement, which significantly degraded the fatigue properties of the welded joint.
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    • 参考文献(7)
  • [1] Zettl B, Mayer H, Ede C, et al. Very high cycle fatigue of normalized carbon steels[J]. International Journal of Fatigue, 2006, 28(11): 1583-1589.
    [2] Wang Q Y, Kawagoishi N, Chen Q. Fatigue and fracture behaviour of structural Al-alloys up to very long life regimes[J]. International Journal of Fatigue, 2006, 28(11): 1572-1576.
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    [4] 何 超, 崔仕明, 刘永杰, 等. 气孔对铝合金焊接接头超长疲劳寿命的影响[J]. 焊接学报, 2014, 35 (11): 18-22. He Chao, Cui Shiming, Liu Yongjie, et al. Effect of pore on super long fatigue life of aluminum alloy welded joint[J]. Transactions of the China Welding Institution, 2014, 35 (11): 18-22.
    [5] 吴良晨,王东坡, 邓彩艳, 等. 超长寿命区间16Mn钢焊接接头疲劳性能[J]. 焊接学报, 2008, 29(3): 117-120. Wu Liangchen, Wang Dongpo, Deng Caiyan, et al. Fatigue properties of welded joints of 16Mn steel in super long life region[J]. Transactions of the China Welding Institution, 2008, 29(3): 117-120.
    [6] Bathias C. Piezoelectric fatigue testing machines and devices[J]. International journal of fatigue, 2006, 28(11): 1438-1445.
    [7] 吴良晨. 超声频分量双周疲劳载荷作用下焊接接头的疲劳性能[D]. 天津大学, 2008.
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  • 收稿日期:  2014-05-19

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