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利用半高宽分析铝合金X射线法应力测试工艺

王小鹏, 李晓延, 徐洲, 吴奇

王小鹏, 李晓延, 徐洲, 吴奇. 利用半高宽分析铝合金X射线法应力测试工艺[J]. 焊接学报, 2020, 41(12): 86-90. DOI: 10.12073/j.hjxb.20191224003
引用本文: 王小鹏, 李晓延, 徐洲, 吴奇. 利用半高宽分析铝合金X射线法应力测试工艺[J]. 焊接学报, 2020, 41(12): 86-90. DOI: 10.12073/j.hjxb.20191224003
WANG Xiaopeng, LI Xiaoyan, XU Zhou, WU Qi. X-ray stress measurement process of aluminum alloy by analysis of the full width at half maxima[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2020, 41(12): 86-90. DOI: 10.12073/j.hjxb.20191224003
Citation: WANG Xiaopeng, LI Xiaoyan, XU Zhou, WU Qi. X-ray stress measurement process of aluminum alloy by analysis of the full width at half maxima[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2020, 41(12): 86-90. DOI: 10.12073/j.hjxb.20191224003

利用半高宽分析铝合金X射线法应力测试工艺

详细信息
    作者简介:

    王小鹏,1991年出生,博士研究生;主要从事焊接残余应力测试与模拟方面的研究;发表学术论文两篇;Email:xpwang@bit.edu.cn.

    通讯作者:

    李晓延,博士,教授;Email:xyli@bjut.edu.cn.

  • 中图分类号: TG 404

X-ray stress measurement process of aluminum alloy by analysis of the full width at half maxima

  • 摘要: 文中采用X射线法测试6061-T6铝合金焊接接头残余应力,为探究合理的应力测试工艺方案,对预置应力的等强梁进行X射线应力测试,测试过程中先后增加准直器直径和摇摆角,以衍射曲线半高宽表征衍射晶粒群微观应变,研究在准直器直径和摇摆角增加时衍射晶粒群微观应变均匀性的变化,对材料进行取向成像分析,并对比在晶粒择优取向强弱不同的两个区间内应力测试的结果. 结果表明,应力测试精度与晶粒择优取向的强弱相关,在晶粒择优取向较强的空间范围内,采用大于1°的摇摆角时,小角度晶界附近的相邻亚晶都能够参与衍射,从而使衍射晶粒群微观应变趋于均匀,因此X射线应力测试精度较高,在d = 2 ~ 4 mm范围内,增加准直器直径d可增加衍射晶粒数目,但对衍射晶粒群微观应变均匀性及应力测试精度的影响不大.
    Abstract: In this paper, X-ray method is used to test the residual stress of 6061-T6 aluminum alloy welded joints. In order to explore a reasonable stress measurement process, X-ray stress test is performed on the pre-stressed equal-strength beam. The diameter of the aperture and the oscillation angle are successively increased during the test. The full width at half maximum of the diffraction profile is used to characterize the microscopic strain of the diffracted grain group. The change in the uniformity of the microscopic strain of the diffracted grain group is analyzed when the aperture diameter and oscillation angle increase, as wll as performing orientation imaging analysis to compare the grain selection between two stress test scheme in different intervals of preferred orientation of the grains. The results show that the stress test accuracy is related to the strength of the preferred orientation of the grains. In the spatial range where the preferred orientation of the grains is strong, when oscillation angle greater than 1° is used, the adjacent sub-crystals near the small-angle grain boundary can participate in the diffraction, so that the microscopic strain of the diffracted crystal grain group tends to be uniform, so the X-ray stress measurement accuracy is higher, and when the aperture is added in the range of d = 2 ~ 4 mm, the increase of diameter d can increase the number of diffracted grains, but has little effect on the microscopic strain uniformity of the diffracted grain group and the accuracy of stress testing.
  • 图  1   等强梁尺寸及其预置应力示意图 (mm)

    Figure  1.   Schematic diagram of equal-strength beam size and its pre-stress. (a) shape and size of equal-strength beam; (b) method of pre-stressing on equal-strength beam

    图  2   残余应力测试点分布(mm)

    Figure  2.   Distribution of the points for residual stress test (mm)

    图  3   不同直径的准直器下衍射线强度及半高宽分布

    Figure  3.   Intensity and FWHM of diffraction profile under aperture with different diameters. (a) distribution of diffraction intensity; (b) distribution of FWHM

    图  4   准直器直径对应力测试结果的影响

    Figure  4.   Influence of aperture diameter on stress measurement results

    图  5   不同摇摆角下衍射线半高宽

    Figure  5.   FWHM of diffraction profile under different oscillation angles

    图  6   晶界分布图

    Figure  6.   Grain boundary distribution map. (a) grain boundaries with misorientation greater than 0.5°; (b) grain boundaries with misorientation greater than 1°; (c) grain boundaries with misorientation greater than 2°

    图  7   摇摆角对应力测试结果的影响

    Figure  7.   Influence of oscillation angles on stress measurement results

    图  8   焊接残余应力分布

    Figure  8.   Distribution of welding residual stress. (a) distribution of σx along the x direction; (b) distribution of σy along the x direction; (c) distribution of σx along the y direction; (d) distribution of σy along the y direction

    表  1   对比试验方案

    Table  1   Comparative test plan

    组号准直器直径d/mm摇摆角$\;\beta$/(°)
    A-1 2 0
    A-2 3 0
    A-3 4 0
    B-1 4 0
    B-2 4 1
    B-3 4 2
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-12-23
  • 网络出版日期:  2021-01-07
  • 刊出日期:  2021-02-01

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