| HE Qiong,LI Yonggang,ZHU Yanqiang,YANG Linzi.Effect of Cryogenic Treatment on the Wear and Corrosion Resistance of X52 Pipeline Steel[J],53(8):74-83 |
| Effect of Cryogenic Treatment on the Wear and Corrosion Resistance of X52 Pipeline Steel |
| Received:April 19, 2023 Revised:August 22, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.08.007 |
| KeyWord:cryogenic treatment X52 pipeline steel microstructure wear resistance corrosion resistance |
| Author | Institution |
| HE Qiong |
College of Mechanical and Vehicle Engineering,Shanxi Provincial Key Laboratory of Precisely Machining, Shanxi Research Center for Metal Material Corrosion and Protection Engineering Technology, Taiyuan University of Technology, Taiyuan , China |
| LI Yonggang |
College of Mechanical and Vehicle Engineering,Shanxi Provincial Key Laboratory of Precisely Machining, Shanxi Research Center for Metal Material Corrosion and Protection Engineering Technology, Taiyuan University of Technology, Taiyuan , China |
| ZHU Yanqiang |
College of Mechanical and Vehicle Engineering,Shanxi Provincial Key Laboratory of Precisely Machining, Shanxi Research Center for Metal Material Corrosion and Protection Engineering Technology, Taiyuan University of Technology, Taiyuan , China |
| YANG Linzi |
College of Mechanical and Vehicle Engineering,Shanxi Provincial Key Laboratory of Precisely Machining, Shanxi Research Center for Metal Material Corrosion and Protection Engineering Technology, Taiyuan University of Technology, Taiyuan , China |
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| Abstract: |
| In order to improve the wear and corrosion resistance of X52 pipeline steel matrix and analyze the mechanism of the impact of cryogenic treatment on the property of X52 pipeline steel, the work aims to adopt the liquid method for cryogenic treatment of X52 pipeline steel for different time at the processing temperature of −196 ℃. The microstructure, phase composition, and tensile properties of X52 pipeline steel after deep cryogenic treatment were analyzed by ultra-deep field optical microscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and universal tensile machine. The microhardness and friction coefficient of X52 pipeline steel specimens were tested by a microhardness tester and a friction and wear tester. Then, the morphology and element distribution of the wear marks were analyzed by SEM and EDS. The Tafel curve of X52 pipeline steel after cryogenic treatment was tested in a simulated soil solution by electrochemical workstation, and the corrosion resistance of the specimens was evaluated. After different time of deep cryogenic treatment, the microhardness, tensile strength, and elastic modulus of the specimens were improved due to the precipitation of dispersed carbides and grain refinement, but the change in yield strength was not significant. When the duration of cryogenic treatment was 30 hours, its microhardness reached the maximum value of 210.8HV0.2, which was 10.77% higher than 190.3HV0.2 in non-cryogenic state. When the duration of cryogenic treatment was 7 hours, its tensile strength reached its maximum value of 600.7 MPa, which was 4.05% higher than 574.7 MPa in the non-cryogenic state. Under the enormous cold shrinkage stress, the grain size of the specimens was refined, and the distribution of dispersed carbides was more uniform, which led to a decrease in the average friction coefficient of the specimens after cryogenic treatment. The change in the average friction coefficient showed a trend of firstly decreasing and then increasing. After 7 hours of cryogenic treatment, the average friction coefficient of the specimens decreased from the initial value of 0.665 to the lowest value of 0.425. The wear resistance of the specimens was improved, and the wear mechanism was a combination of oxidation wear and abrasive wear, with abrasive wear playing a major role. The polarization curve results showed that the self-corrosion potential of the specimens after cryogenic treatment shifted positively. When the duration of cryogenic treatment was 11, 30, and 55 h, the self-corrosion potential of the specimens in a simulated soil solution shifted positively from −0.895 V in the non-cryogenic state to −0.796, −0.859 and −0.864 V, respectively, and the corrosion current density decreased from 15.47×10−6 A/cm2 in the non-cryogenic state to 1.781×10−6, 1.335×10−6 and 1.257×10−6 A/cm2 respectively, with a decrease of one order of magnitude. This indicated that the corrosion resistance of the X52 pipeline steel was improved. In summary, cryogenic treatment can effectively improve the mechanical properties, wear resistance, and corrosion resistance of X52 pipeline steel, and has potential application prospects in the field of pipeline transportation. |
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