Ultrasonic cavitation erosion behavior of 304 stainless steel after corrosion in NaCl solution

被引：0

作者：

Chen J. ^{[1
]}

Liu H. ^{[1
]}

Liu G. ^{[1
]}

Wei X. ^{[1
]}

Deng Z. ^{[1
]}

Ouyang Y. ^{[1
]}

机构：

[1] School of Materials Science and Engineering, Jiangsu University, Zhenjiang

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2021年 / 52卷 / 05期

基金：

中国国家自然科学基金;

关键词：

304 stainless steel; Cavitation erosion; Corrosion; NaCl solution;

D O I：

10.11817/j.issn.1672-7207.2021.05.005

中图分类号：

学科分类号：

摘要：

An ultrasonic cavitation erosion experiment, which conforms to the ASTM G32 standard, was carried out on 304 stainless steel after corrosion in the NaCl solution. The effects of standoff distance and cavitation erosion time were described through mass loss, surface microstructure, surface morphology, surface roughness, microhardness and residual stress. The results show that the capability of resisting cavitation erosion of 304 stainless steel corroded in the NaCl solution is enhanced compared to that of non-corroded samples. In the later stage of cavitation erosion, fatigue damage is the main cause of cavitation damage.With the extension of cavitation erosion time, microcracks in the eroded surface increase and the depth of cavitation erosion pits increases as well, but the surface roughness varies insignificantly after cavitation erosion of 240 min due to the increase of local standoff distance. The effect of standoff distance on cavitation erosion is more remarkable than that of the cavitation erosion time. At certain cavitation erosion time, both the cumulative mass loss and the cumulative mass loss rate arrive at their maxima at a standoff distance of 0.4 mm. At this standoff distance, the thickness of the hardened layer reaches 250 μm, the maximum hardness arises at the depth of 50 μm, but the highest residual stress occurs at a standoff distance of 0.6 mm. © 2021, Central South University Press. All right reserved.

引用

页码：1436 / 1445

页数：9

共 22 条

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