Research on Corrosion and Fatigue Resistance of Pressure Vessel Steel Q345R after Laser Shock Repair
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摘要: 本文对激光冲击强化(LSP)后的压力容器材料Q345R钢的耐腐蚀性能和抗疲劳性能进行研究。通过电化学实验,并结合扫描电子显微镜(SEM)分析其耐腐蚀性,结果显示,有吸收层保护和无吸收层保护激光冲击后,相较于原试样,耐腐蚀性分别提升5.8倍和2.6倍;微观实验结果表明经过激光冲击后腐蚀试样表面裂纹明显少于未处理试样。但随着冲击次数增加,耐腐蚀性有所下降。疲劳试验结果显示,相同应力条件下,腐蚀1小时和2小时的疲劳寿命相较于原试样降低36.8%和56.4%,经过一次或三次激光冲击后试件的疲劳寿命分别提升43.8%和198.2%,经XRD检测,激光冲击能在表面形成一定深度的残余压应力层并抑制裂纹扩展。Abstract: The corrosion and fatigue resistance of pressure vessel material Q345R steel after laser shock peening was studied. By electrochemical experiment and SEM micro-analysis, it shows that the corrosion resistance of the samples treated by LSP (Laser Shock Peening) with absorber layer and without absorber layer is increased by 5.8 times and 2.6 times respectively. The micro-experiment results show that the surface crack of corroded sample after LSP treatment is significantly less than untreated specimen. While the corrosion resistance decreases with the increase of the number of LSP. The S-N curves obtained from fatigue tests show that under the same stress conditions, the fatigue life after 1 hour and 2 hours’ corrosion is reduced by 36.8% and 56.4% compared to the original sample and the fatigue life after one and three LSP treatments times is increased by 43.8% and 198.2%. After XRD inspection tests, it is found that the laser shock peening can form a certain depth of residual compressive stress layer on the surface and effectively inhibit fatigue crack expansion.
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Key words:
- laser shock /
- electrochemical corrosion /
- polarization curve /
- fatigue stretching /
- S-N curves
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