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Residual Stress Distribution in Water Jet Peened Type 304 Stainless Steel

机译：水喷射型304不锈钢中的残余应力分布

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摘要

In materials with a surface treatment such as shot peening, the residual stress gradient in the surface layer is severe. When measuring the residual stress distribution near the surface with a severe stress gradient by the neutron diffraction method, the gauge volume must be removed from the measurement sample. However, when the gauge volume deviates from the sample, a pseudo peak shift occurs and accurate stress distribution cannot be evaluated. Therefore, it is necessary to evaluate the pseudo peak shift in advance under the same conditions, as in the case of actual residual stress measurement, using a sample in an unstressed state. In this study, the stress distributions in the surface layer of a type 304 stainless steel plate and bar with simulated stress-corrosion cracks which were subjected to water jet peening—giving a surface layer residual stress equivalent better than that of normal shot peening—were evaluated considering the pseudo peak shift. As a result, the residual stress distributions in the surface layer were measured in good agreement with the measurement result obtained by the sequential polishing X-ray diffraction method. It was clarified that the residual stress distribution in the near surface with steep stress gradient can be evaluated by the neutron diffraction method.
机译：在具有表面处理的材料中的材料，例如喷丸喷丸，表面层中的残余应力梯度是严重的。当通过中子衍射法测量具有严重应力梯度的表面附近的残余应力分布时，必须从测量样品中除去量大尺。然而，当规格体积偏离样品时，发生伪峰值偏移并且无法评估精确的应力分布。因此，必须在与实际残余应力测量的情况下使用在不重定的状态下的样本的情况下预先评估伪峰值偏移。在这项研究中，304型不锈钢板的表面层和具有模拟应力 - 腐蚀裂缝的表面层的应力分布，该钢板经受喷水喷射净化的，使表面层残余应力相当于正常射击喷丸 - 是考虑伪峰值转变评估。结果，与通过顺序抛光X射线衍射方法获得的测量结果良好地测量表面层中的残余应力分布。澄清，可以通过中子衍射法评估近沉淀应力梯度的近表面中的残余应力分布。

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