激光冲击修复后压力容器钢Q345R耐腐蚀及抗疲劳性能研究

张浩; 蒋磊; 岑志波; 张拔杨; 谢作然; 朱珏

doi:10.11883/bzycj-2021-0394

激光冲击修复后压力容器钢Q345R耐腐蚀及抗疲劳性能研究

doi: 10.11883/bzycj-2021-0394

张浩^1,,
蒋磊²,
岑志波³,
张拔杨¹,
谢作然¹,
朱珏^1, ,

1.
宁波大学机械工程与力学学院，浙江宁波 315211
2.
宁波市特种设备检验研究院，浙江宁波 315211
3.
宁波计量测试研究院，浙江宁波 315211

基金项目: 国家自然科学基金（11972203，11572162）；宁波市自然科学基金（202003N4152）

详细信息

作者简介:
张　浩（1996－　），男，硕士研究生，1281934177@qq.com

通讯作者:
朱　珏（1979－　），女，博士，教授，zhujue@nbu.edu.cn

中图分类号: O346.2;O389
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- 被引次数: 0
出版历程
- 收稿日期: 2021-09-22
- 修回日期: 2021-12-16
- 网络出版日期: 2022-03-30
- 刊出日期: 2022-10-31

On corrosion and fatigue resistance of pressure vessel steel Q345R after laser shock repair

1.
College of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, Zhejiang, China
2.
Ningbo Special Equipment Inspection Research Institute, Ningbo 315211, Zhejiang, China
3.
Ningbo Institute of Metrology and Testing, Ningbo 315211, Zhejiang, China

摘要

摘要: 对激光冲击强化后的压力容器材料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和2 h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。
- 激光冲击强化 /
- 电化学腐蚀 /
- 极化曲线 /
- 疲劳寿命 /
- 微观形貌
Abstract: Electrochemical corrosion and fatigue tests were carried out to study the corrosion resistance and fatigue resistance of the pressure vessel material Q345R steel after laser shock peening (LSP). The material was cut into samples of 6 mm×10 mm×10 mm, with water as constraint layer and black tape as absorption layer. Laser shock peening was carried out for 1, 3, 5 and 7 times respectively. The samples were immerged in 3.5% NaCl solution for electrochemical corrosion. Tafel extrapolation method was used to obtain the polarization curves of the corrosion resistance of the reactive materials. The results show that the samples have the best corrosion resistance after a single shock, their corrosion resistances decrease after multiple shocks, the corrosion resistance without black tape decreases more obviously, the black tape serving as absorbing layer can effectively protect the sample from the LSP damage. The micro-observations show that surface cracks on corrosion specimen after LSP were significantly less than those on the untreated sample. S-N curves were obtained by MTS fatigue test of samples after different corrosion time and LSP times. The results show that under the same stress condition, the fatigue life of samples after 1- or 2-hours’ corrosion decreased 36.8% and 56.4%, respectively compared with that of the original sample. After one and three shocks, the fatigue life of the specimens increases 43.8% and 198.2%, respectively. X-ray diffraction (XRD) was used to analyze the residual stress on the surface of the sample. It was detected that the residual tensile stress on the surface of the untreated sample is 34.4MPa, and the residual compressive stresses on the surface of samples after one and three shocks were 205.6 and 288.5 MPa, respecitvely. It indicates that the residual compressive stress layer with a certain depth was formed on the surface, which inhibited the crack propagation and improved the fatigue life.
- laser shock peening /
- electrochemical corrosion /
- polarization curve /
- fatigue life /
- micromorphology

HTML全文

图 1 激光冲击原理图

Figure 1. Schematic diagram of laser shock

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图 2 50%搭接示意图

Figure 2. Schematic diagram of 50% lapping

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图 3 激光冲击处理后的试样

Figure 3. The samples after laser shock peening treatment

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图 4 电化学测试原理（单位：mm）

Figure 4. Electrochemical test system (unit: mm)

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图 5 不同次数激光冲击下无吸收层保护的Q345R极化曲线

Figure 5. Polarization curves of Q345R without absorption layer protection under different laser shocks

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图 6 不同次数激光冲击下有吸收层保护的Q345R极化曲线

Figure 6. Polarization curves of Q345R with absorption layer protection under different laser shocks

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图 7 不同冲击次数下有无吸收层保护的Q345R的绝对腐蚀速率

Figure 7. The absolute corrosion rate of Q345R with and without absorption layer protection at different impact times

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图 8 激光冲击后金相组织

Figure 8. Metallographic structures after LSP

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图 9 疲劳试样尺寸

Figure 9. The size of the fatigue specimen

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图 10 腐蚀后疲劳试样

Figure 10. Fatigue specimens after corrosion

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图 11 不同表面状态下Q345R的疲劳寿命（N）

Figure 11. Fatigue life (N) of Q345R under different surface conditions

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表 1 不同激光冲击次数下有或无吸收层保护的Q345R腐蚀速率

Table 1. Corrosion rate of Q345R with or without absorption layer protection at different LSP times

冲击次数腐蚀速率/(mm·a⁻¹)
无吸收层有吸收层

0 0.9087 0.9087
1 0.2555 0.1335
3 0.4862 0.3738
5 0.6104 0.3286
7 0.7237 0.3125

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