The Influence of Precipitate Morphology on the Growth of Austenite Grain in Nb-Ti-Al Microalloyed Steels
The present study investigates the morphological evolution of carbonitrides and the effect of these precipitates on grain boundary pinning during pseudo-carburizing a Nb-Ti-Al microalloyed steel. The result indicated that three kinds of complex precipitates with different morphologies containing Nb,...
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MDPI AG
2022-04-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/9/3176 |
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| author | Junfeng Yuan Yang Xiao Na Min Wei Li Sixin Zhao |
| author_facet | Junfeng Yuan Yang Xiao Na Min Wei Li Sixin Zhao |
| author_sort | Junfeng Yuan |
| collection | DOAJ |
| description | The present study investigates the morphological evolution of carbonitrides and the effect of these precipitates on grain boundary pinning during pseudo-carburizing a Nb-Ti-Al microalloyed steel. The result indicated that three kinds of complex precipitates with different morphologies containing Nb, Ti, and Al respectively were observed in samples austenitized at different temperatures and times. The NbC and TiN precipitates played an important role in pinning grain boundaries and suppressing the growth of austenite grains, relying on the high thermal stability of TiN precipitates and small size of NbC precipitates. The precipitate characteristics affected the size of austenite grain. Based on the Zener pinning model, the effect of precipitate characteristic on austenite grain size was quantitatively analyzed. It is found that the existence of NbC and TiN precipitated at high temperature makes austenite grain growth difficult when austenite grain boundaries were pinned by fine and diffused precipitates. |
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| language | English |
| last_indexed | 2024-03-10T03:58:34Z |
| publishDate | 2022-04-01 |
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| spelling | doaj.art-7dc2309f77b84fd1ac2ffa9abb2a3b2e2023-11-23T08:39:20ZengMDPI AGMaterials1996-19442022-04-01159317610.3390/ma15093176The Influence of Precipitate Morphology on the Growth of Austenite Grain in Nb-Ti-Al Microalloyed SteelsJunfeng Yuan0Yang Xiao1Na Min2Wei Li3Sixin Zhao4School of Materials Science and Engineering, Shanghai University, Shanghai 200444, ChinaSchool of Materials Science and Engineering, Shanghai University, Shanghai 200444, ChinaLaboratory for Microstructures, Shanghai University, Shanghai 200444, ChinaShanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240, ChinaLong Products Research Institute, R&D Center, Baoshan Iron & Steel Co., Ltd., Shanghai 201900, ChinaThe present study investigates the morphological evolution of carbonitrides and the effect of these precipitates on grain boundary pinning during pseudo-carburizing a Nb-Ti-Al microalloyed steel. The result indicated that three kinds of complex precipitates with different morphologies containing Nb, Ti, and Al respectively were observed in samples austenitized at different temperatures and times. The NbC and TiN precipitates played an important role in pinning grain boundaries and suppressing the growth of austenite grains, relying on the high thermal stability of TiN precipitates and small size of NbC precipitates. The precipitate characteristics affected the size of austenite grain. Based on the Zener pinning model, the effect of precipitate characteristic on austenite grain size was quantitatively analyzed. It is found that the existence of NbC and TiN precipitated at high temperature makes austenite grain growth difficult when austenite grain boundaries were pinned by fine and diffused precipitates.https://www.mdpi.com/1996-1944/15/9/3176microalloyed steelsprecipitateaustenite grain growthpinning pressure |
| spellingShingle | Junfeng Yuan Yang Xiao Na Min Wei Li Sixin Zhao The Influence of Precipitate Morphology on the Growth of Austenite Grain in Nb-Ti-Al Microalloyed Steels Materials microalloyed steels precipitate austenite grain growth pinning pressure |
| title | The Influence of Precipitate Morphology on the Growth of Austenite Grain in Nb-Ti-Al Microalloyed Steels |
| title_full | The Influence of Precipitate Morphology on the Growth of Austenite Grain in Nb-Ti-Al Microalloyed Steels |
| title_fullStr | The Influence of Precipitate Morphology on the Growth of Austenite Grain in Nb-Ti-Al Microalloyed Steels |
| title_full_unstemmed | The Influence of Precipitate Morphology on the Growth of Austenite Grain in Nb-Ti-Al Microalloyed Steels |
| title_short | The Influence of Precipitate Morphology on the Growth of Austenite Grain in Nb-Ti-Al Microalloyed Steels |
| title_sort | influence of precipitate morphology on the growth of austenite grain in nb ti al microalloyed steels |
| topic | microalloyed steels precipitate austenite grain growth pinning pressure |
| url | https://www.mdpi.com/1996-1944/15/9/3176 |
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