Introduction of compressive residual stress into stainless steel by employing a cavitating jet in air
Introduction of compressive residual stress into stainless steel by employing a cavitating jet in air
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DOI：
10.1016/j.surfcoat.2010.11.031
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发表时间：
2011-02-15
影响因子：
5.4
通讯作者：
Takakuwa, Osamu
中科院分区：
文献类型：
--
作者：
Soyama, Hitoshi;Kikuchi, Tsutomu;Takakuwa, Osamu
为了消除应力腐蚀裂纹，提出了一种不使用喷丸，利用空化冲击引入残余压应力的方法。空化射流在空气中成功地产生了空化冲击，而不需要充满水的腔室。优化了射流的注射条件，并利用射流演示了压残余应力在不锈钢中的引入。优化后的射流在表面引入的最大残余压应力为500 MPa，而改性层的厚度可达400 pm。考虑空化冲击的随机现象，提出了一种以加工时间为函数估计射流引入残余压应力的方法。02 Hz的强烈冲击和4.5 Hz的相对较弱的冲击都影响残余压应力的引入。根据所建立的实验方程，可以估计出残余应力和修正层厚度的值。(C) 2010 Elsevier B.V.版权所有
In order to eliminate stress corrosion cracking, a method of introduction of compressive residual stress using cavitation impacts was proposed, without use of shots. The cavitation impacts were successfully produced by a cavitating jet in air, without the requirement of a water-filled chamber. The injection condition of the jet was optimized and the introduction of compressive residual stress into stainless steel was demonstrated using the jet. The maximum compressive residual stress introduced by the optimized jet was 500 MPa on the surface, while the thickness of the modified layer was up to 400 pm. A method fir estimation of the introduced compressive residual stress by the jet as a function of processing time was proposed, considering the stochastic phenomena of the cavitation impacts. Both the intense impact at 02 Hz and relatively weak impact at 4.5 Hz affect the introduction of compressive residual stress. The value of the residual stress and the thickness of the modified layer can be estimated by the proposed experimental equation. (C) 2010 Elsevier B.V. All rights reserved.