Effect of Postweld Heat Treatment on the Corrosion Behavior of 1.25Cr0.5Mo Steel in Circulating Water
At present, the influence of post-weld heat treatment on the corrosion behavior of 1.25Cr0.5Mo steel has less been reported in literatures.Thus, the normalized 1.25Cr0.5Mo steel was quenched, tempered at high temperature or quenched and tempered to simulate different post weld heat treatment process...
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| Main Author: | |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Department of Materials Protection
2021-06-01
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| Series: | Cailiao Baohu |
| Subjects: | |
| Online Access: | http://www.mat-pro.com/fileup/1001-1560/PDF/20210615.pdf |
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| Summary: | At present, the influence of post-weld heat treatment on the corrosion behavior of 1.25Cr0.5Mo steel has less been reported in literatures.Thus, the normalized 1.25Cr0.5Mo steel was quenched, tempered at high temperature or quenched and tempered to simulate different post weld heat treatment process.Subsequently, the corresponding metallographic structure was analyzed, the corrosion behavior was tested by electrochemical method, and the effect of different heat treatment on the structure and corrosion resistance of 1.25Cr0.5Mo steel was further studied.Results showed that the metallographic structure of normalized 1.25Cr0.5Mo steel was ferrite and pearlite, the quenched structure was lath martensite, the high temperature tempered structure was coarse ferrite and pearlite, and the quenched and tempered structure was uniform tempered martensite and fine carbide.Meanwhile, the quenching treatment accelerated the corrosion rate of 1.25Cr0.5Mo steel in industrial circulating water, but the high temperature tempering treatment had little effect on the corrosion behavior.In contrast, the corrosion resistance of 1.25Cr0.5Mo steel was obviously improved by quenching and tempering.The results show that quenching and tempering heat treatment could refine the structure of the 1.25Cr0.5Mo steel, and the refined structure was easier to form oxide film than the quenching and high temperature tempering structure after quenching, which had coarse grain and hindered the discharge process of the electrode, thus obtaining better corrosion resistance. |
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| ISSN: | 1001-1560 |