| LIU Wei,WU Jing-na,CAI Zhi-gang,SU Cheng,SHEN Yu-ming,LU Jun-wei,QIAN Jiong,ZHONG Qiang.Solid Solution Nitriding of TP304L Stainless Steel During Short-time Heat Treatment[J],50(12):167-173, 201 |
| Solid Solution Nitriding of TP304L Stainless Steel During Short-time Heat Treatment |
| Received:November 24, 2020 Revised:May 24, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.12.017 |
| KeyWord:nitriding TP304L stainless steel short-time heat treatment supersaturated solid solution pitting corrosion potential |
| Author | Institution |
| LIU Wei |
Zhejiang Province High-performance Tube Forming Engineering Technology Research Center for Nuclear Power, Jiuli R&D Center, Zhejiang Jiuli Hi-Tech Metals Co., Ltd., Huzhou , China |
| WU Jing-na |
Zhejiang Province High-performance Tube Forming Engineering Technology Research Center for Nuclear Power, Jiuli R&D Center, Zhejiang Jiuli Hi-Tech Metals Co., Ltd., Huzhou , China |
| CAI Zhi-gang |
Zhejiang Province High-performance Tube Forming Engineering Technology Research Center for Nuclear Power, Jiuli R&D Center, Zhejiang Jiuli Hi-Tech Metals Co., Ltd., Huzhou , China |
| SU Cheng |
Zhejiang Province High-performance Tube Forming Engineering Technology Research Center for Nuclear Power, Jiuli R&D Center, Zhejiang Jiuli Hi-Tech Metals Co., Ltd., Huzhou , China |
| SHEN Yu-ming |
Zhejiang Province High-performance Tube Forming Engineering Technology Research Center for Nuclear Power, Jiuli R&D Center, Zhejiang Jiuli Hi-Tech Metals Co., Ltd., Huzhou , China |
| LU Jun-wei |
Zhejiang Province High-performance Tube Forming Engineering Technology Research Center for Nuclear Power, Jiuli R&D Center, Zhejiang Jiuli Hi-Tech Metals Co., Ltd., Huzhou , China |
| QIAN Jiong |
Zhejiang Province High-performance Tube Forming Engineering Technology Research Center for Nuclear Power, Jiuli R&D Center, Zhejiang Jiuli Hi-Tech Metals Co., Ltd., Huzhou , China |
| ZHONG Qiang |
Zhejiang Province High-performance Tube Forming Engineering Technology Research Center for Nuclear Power, Jiuli R&D Center, Zhejiang Jiuli Hi-Tech Metals Co., Ltd., Huzhou , China |
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| Abstract: |
| The work aims to study the solid solution nitriding behavior of TP304L stainless steel during short-time high- temperature treatment in N2 atmosphere. Nitrided tubes and non-nitrided tubes were prepared by short-time high-temperature heat-treatment with N2 and Ar as protective atmospheres. SEM-EDS and XPS were used for microstructure observation and composition analysis. Vickers Indenter was used to measure the surface hardness, and the corrosion resistance was compared through intergranular corrosion test and electrochemical pitting corrosion test. Compared to non-nitrided tubes, the average surface hardness of the nitrided tube increased by 30HV0.1. The content of N element on the surface of the nitrided tube was increased, and the penetration depth of N was about 2 μm. No nitride compounds were found by SEM. The analysis of element valence state by XPS indicated that the N atoms formed Fe-N bonds, which mostly corresponded to α″-Fe16N2/α′-Fe8N, as the form of solid solution and supersaturated solid solution. Cr-N bond was undetectable, indicating that there is no harmful Cr2N phase. The electrochemical pitting potential of nitrided tubes increases by 20~100 mV, with improved pitting resistance, and its resistance property of intergranular corrosion was equal to non-nitrided tubes. In summary, the short-time high-temperature heat-treatment of TP304L stainless steel in N2 atmosphere caused solution nitriding behavior, which improved the surface hardness and corrosion resistance, without the precipitation of Cr-N or Fe-N phase. |
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