Fracture Mechanics. Improvement of Residual Stress in Stainless Steel by Cavitating Jet.
Fracture Mechanics. Improvement of Residual Stress in Stainless Steel by Cavitating Jet.
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断裂力学。
DOI：
10.2472/jsms.47.808
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
H. Abé
中科院分区：
文献类型：
--
作者：
H. Soyama;Jungsu Park;M. Saka;H. Abé
为了强化材料，研究了空化射流对不锈钢残余应力的改善作用。在空化射流的情况下，空化强度可以通过上游压力和下游压力等水力参数来控制。一般情况下，气蚀会对水力机械造成损坏。在空蚀初期，材料表面发生塑性变形，考虑空蚀强度和暴露时间，可以进行无损伤喷丸。为了验证空化射流改善残余应力的适宜条件，对SUS304和SUS316两种材料的残余应力进行了测试。采用X射线衍射法测量了不同方向的三个法向应力，并计算了主应力。空化射流使两个主应力在10秒内由拉伸变为压缩。空化射流产生的压应力在一定时间后达到饱和。结果表明，空化射流对不锈钢SUS316和SUS304的残余应力均有改善作用。
In order to strengthen materials, the improvement of residual stress in stainless steel by using a cavitating jet was investigated. In case of cavitating jet, the cavitation intensity can be controlled by hydraulic parameters such as upstream pressure and downstream pressure. In general, cavitation produces damage on hydraulic machinery. However, at the initial stage of cavitation erosion process, plastic deformation takes place on the material surface, then it is possible to do peening without damage considering the cavitation intensity and the exposure time. In order to evidence the suitable condition on the improvement of residual stress by the cavitating jet, the residual stress in SUS304 and SUS316 was examined. The three normal stresses in different directions were measured by X-ray diffraction method, then the principal stresses were calculated. Both principal stresses were changed from tension to compression within 10 seconds by the cavitating jet. The compressive stress resulted by the cavitating jet was saturated after a certain time. It was concluded that the cavitating jet improved the residual stress in stainless steel SUS316 as well as SUS304.