Method of X-ray residual stress measurement for phase transformed welds
Method of X-ray residual stress measurement for phase transformed welds
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DOI：
10.1007/s40194-015-0232-5
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发表时间：
2015-02
影响因子：
2.1
通讯作者：
A. Tsuji;Shigetaka Okano;M. Mochizuki
中科院分区：
文献类型：
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作者：
A. Tsuji;Shigetaka Okano;M. Mochizuki
在这项研究中，我们试图评估残余应力分布在焊缝伴随着相变，用X射线应力测量。首先，讨论了不同相变状态下焊接试样的相变行为与残余应力的关系。在焊缝中具有马氏体的试样中，由于马氏体转变而导致的拉应力降低在残余应力分布中显示为遵循常规行为。而焊缝中含有贝氏体铁素体的试样，其横向残余应力与纵向残余应力几乎相同，且残余应力不遵循常规行为。接着，测量焊缝中的X射线弹性常数，然后重新评估残余应力。在焊缝中含有贝氏体铁素体的试样中，X射线弹性常数具有各向异性，重新评估的残余应力遵循常规行为。总之，根据相变行为，很难使用由Kröner模型估计的X射线弹性常数;但是，如果我们使用测量值，我们能够更准确地评估残余应力。
In this study, we attempted to evaluate the residual stress distribution in welds accompanied by phase transformation using X-ray stress measurement. First, relationship between the phase transformation behavior and the residual stress of welded specimens with different phase transformation was discussed. In the specimen with martensite in the weld, reduction in tensile stress due to martensite transformation shown in residual stress distribution followed conventional behavior. However, in the specimen with bainitic ferrite in the weld, the residual stress in the transverse direction was almost the same as the residual stress in the longitudinal direction, and the residual stress did not follow conventional behavior. Next, X-ray elastic constant in the weld was measured, and then the residual stress was reevaluated. In the specimen with bainitic ferrite in the weld, X-ray elastic constant had anisotropy, and the reevaluated residual stress followed conventional behavior. In conclusion, it was shown that depending on the phase transformation behavior, it is difficult to use X-ray elastic constant estimated by Kröner model; however, if we use the measured value, we are able to evaluate the residual stress more accurately.