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首页> 外文期刊>Physica, B. Condensed Matter >Verification of residual stresses in flash-butt-weld rails using neutron diffraction
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Verification of residual stresses in flash-butt-weld rails using neutron diffraction

机译：用中子衍射验证闪光对焊焊轨中的残余应力

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Residual stresses developed during flash-butt welding may play a crucial role in prolonging the fatigue life of the welded tracks under service loading conditions. The finished welds typically exhibit high levels of tensile residual stresses in the web region of the weld. Moreover, the surface condition of the web may contain shear drag or other defects resulting from the shearing process which may lead to the initiation and propagation of fatigue cracks in a horizontal split web failure mode under high axle loads. However, a comprehensive understanding into the residual stress behaviour throughout the complex weld geometry remains unclear and is considered necessary to establish the correct localised post-weld heat treatment modifications intended to lower tensile residual stresses. This investigation used the neutron diffraction technique to analyse residual stresses in an AS60 flash-butt-welded rail cooled under normal operating conditions. The findings will ultimately contribute to developing modifications to the flash-butt-welding procedure to lower tensile residual stresses which may then improve rail performance under high axle load. (c) 2006 Elsevier B.V. All rights reserved.
机译：在对接焊接过程中产生的残余应力可能在延长工作负载条件下焊接轨道的疲劳寿命方面起着至关重要的作用。精加工的焊缝通常在焊缝的腹板区域表现出高水平的拉伸残余应力。此外，腹板的表面状况可能包含剪切力或剪切过程产生的其他缺陷，这些缺陷可能导致在水平轴裂腹板在高轴载荷下的破坏模式下疲劳裂纹的萌生和传播。但是，对于整个复杂的焊接几何形状中的残余应力行为的全面了解仍然不清楚，并且被认为对于建立旨在降低拉伸残余应力的正确的局部焊接后热处理修改是必要的。这项研究使用中子衍射技术来分析在正常工作条件下冷却的AS60快熔对接焊轨中的残余应力。这些发现最终将有助于改进对接焊接程序，以降低拉伸残余应力，从而在高车轴载荷下改善钢轨性能。 （c）2006 Elsevier B.V.保留所有权利。

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