Influence of N on precipitation behavior and transformation kinetics of super austenitic stainless steels after isothermal ageing at 900 °C
The precipitation behavior and transformation kinetics of secondary phases of super austenitic stainless steels 654SMO containing 0.4wt.% N and 0.5wt.% N were investigated following ageing at 900 °C for varied time. It was revealed that the increase of N did not lead to the refinement of sigma preci...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-07-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785422009723 |
| _version_ | 1811281314270150656 |
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| author | Luhai Liao Zhengxiang Zhao Fanghong Xu Wei Zhang Jingyuan Li |
| author_facet | Luhai Liao Zhengxiang Zhao Fanghong Xu Wei Zhang Jingyuan Li |
| author_sort | Luhai Liao |
| collection | DOAJ |
| description | The precipitation behavior and transformation kinetics of secondary phases of super austenitic stainless steels 654SMO containing 0.4wt.% N and 0.5wt.% N were investigated following ageing at 900 °C for varied time. It was revealed that the increase of N did not lead to the refinement of sigma precipitates. Super austenitic stainless steel with 0.4wt.% N presented more uniform and homogeneous precipitation. This unexpected event was caused by a higher sigma nucleation rate than the growth rate of the 0.4wt.% N alloy. The area fraction of precipitates of 0.5wt.% N alloy was lower than that of 0.4wt.% N alloy, which was most likely due to the lesser number of particles nucleated overcompensating the fast growth of sigma particles caused by rising N concentration. Furthermore, increasing the N content did not speed up but slowed down the precipitation of the Cr2N phase. The Cr2N phases were found nucleated at the σ/γ interface, implying that the higher sigma transformation fraction of the 0.4wt.% N alloy promoted the precipitation of nitrides. The modified Johnson-Mehl-Avrami model was used to describe the transformation kinetics of precipitates in both alloys. There was a good agreement between experimental data and model. |
| first_indexed | 2024-04-13T01:31:30Z |
| format | Article |
| id | doaj.art-dcb5b2fa19e64c1aadb87dc7e6ae68da |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-13T01:31:30Z |
| publishDate | 2022-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-dcb5b2fa19e64c1aadb87dc7e6ae68da2022-12-22T03:08:30ZengElsevierJournal of Materials Research and Technology2238-78542022-07-011936703684Influence of N on precipitation behavior and transformation kinetics of super austenitic stainless steels after isothermal ageing at 900 °CLuhai Liao0Zhengxiang Zhao1Fanghong Xu2Wei Zhang3Jingyuan Li4Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaBeijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaState Key Laboratory of Advanced Stainless Steel Materials, Taiyuan Iron and Steel (Group) Co., Ltd., Taiyuan 030003, Shanxi, ChinaState Key Laboratory of Advanced Stainless Steel Materials, Taiyuan Iron and Steel (Group) Co., Ltd., Taiyuan 030003, Shanxi, ChinaBeijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China; Corresponding author.The precipitation behavior and transformation kinetics of secondary phases of super austenitic stainless steels 654SMO containing 0.4wt.% N and 0.5wt.% N were investigated following ageing at 900 °C for varied time. It was revealed that the increase of N did not lead to the refinement of sigma precipitates. Super austenitic stainless steel with 0.4wt.% N presented more uniform and homogeneous precipitation. This unexpected event was caused by a higher sigma nucleation rate than the growth rate of the 0.4wt.% N alloy. The area fraction of precipitates of 0.5wt.% N alloy was lower than that of 0.4wt.% N alloy, which was most likely due to the lesser number of particles nucleated overcompensating the fast growth of sigma particles caused by rising N concentration. Furthermore, increasing the N content did not speed up but slowed down the precipitation of the Cr2N phase. The Cr2N phases were found nucleated at the σ/γ interface, implying that the higher sigma transformation fraction of the 0.4wt.% N alloy promoted the precipitation of nitrides. The modified Johnson-Mehl-Avrami model was used to describe the transformation kinetics of precipitates in both alloys. There was a good agreement between experimental data and model.http://www.sciencedirect.com/science/article/pii/S2238785422009723austenitic stainless steelNitrogen effectPrecipitation behaviorTransformation kineticsThermodynamics calculation |
| spellingShingle | Luhai Liao Zhengxiang Zhao Fanghong Xu Wei Zhang Jingyuan Li Influence of N on precipitation behavior and transformation kinetics of super austenitic stainless steels after isothermal ageing at 900 °C Journal of Materials Research and Technology austenitic stainless steel Nitrogen effect Precipitation behavior Transformation kinetics Thermodynamics calculation |
| title | Influence of N on precipitation behavior and transformation kinetics of super austenitic stainless steels after isothermal ageing at 900 °C |
| title_full | Influence of N on precipitation behavior and transformation kinetics of super austenitic stainless steels after isothermal ageing at 900 °C |
| title_fullStr | Influence of N on precipitation behavior and transformation kinetics of super austenitic stainless steels after isothermal ageing at 900 °C |
| title_full_unstemmed | Influence of N on precipitation behavior and transformation kinetics of super austenitic stainless steels after isothermal ageing at 900 °C |
| title_short | Influence of N on precipitation behavior and transformation kinetics of super austenitic stainless steels after isothermal ageing at 900 °C |
| title_sort | influence of n on precipitation behavior and transformation kinetics of super austenitic stainless steels after isothermal ageing at 900 °c |
| topic | austenitic stainless steel Nitrogen effect Precipitation behavior Transformation kinetics Thermodynamics calculation |
| url | http://www.sciencedirect.com/science/article/pii/S2238785422009723 |
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