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

ZHANG Hao; JIANG Lei; CEN Zhibo; ZHANG Bayang; XIE Zuoran; ZHU Jue

doi:10.11883/bzycj-2021-0394

Volume 42 Issue 10

Oct. 2022

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ZHANG Hao, JIANG Lei, CEN Zhibo, ZHANG Bayang, XIE Zuoran, ZHU Jue. On corrosion and fatigue resistance of pressure vessel steel Q345R after laser shock repair[J]. Explosion And Shock Waves, 2022, 42(10): 103101. doi: 10.11883/bzycj-2021-0394

Citation:

ZHANG Hao, JIANG Lei, CEN Zhibo, ZHANG Bayang, XIE Zuoran, ZHU Jue. On corrosion and fatigue resistance of pressure vessel steel Q345R after laser shock repair[J]. Explosion And Shock Waves, 2022, 42(10): 103101. doi: 10.11883/bzycj-2021-0394

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

doi: 10.11883/bzycj-2021-0394

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

Received Date: 2021-09-22
Rev Recd Date: 2021-12-16

Available Online: 2022-03-30

Publish Date: 2022-10-31

Abstract

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

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References(25)

References

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