Effect Mechanism of <i>α</i>-Ferrite Sustained Precipitation on High-Temperature Properties in Continuous Casting for Peritectic Steel
Exploring the mechanism of the <i>α</i>-ferrite precipitation process on high-temperature properties plays an important guiding role in avoiding slab cracks and effectively regulating quality. In this work, in situ observation of the α-ferrite sustained precipitation behavior for peritec...
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MDPI AG
2024-03-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/14/3/350 |
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| author | Songyuan Ai Yifan Li Mujun Long Haohao Zhang Dengfu Chen Huamei Duan Danbin Jia Bingzhi Ren |
| author_facet | Songyuan Ai Yifan Li Mujun Long Haohao Zhang Dengfu Chen Huamei Duan Danbin Jia Bingzhi Ren |
| author_sort | Songyuan Ai |
| collection | DOAJ |
| description | Exploring the mechanism of the <i>α</i>-ferrite precipitation process on high-temperature properties plays an important guiding role in avoiding slab cracks and effectively regulating quality. In this work, in situ observation of the α-ferrite sustained precipitation behavior for peritectic steel during the austenitic phase transition process has been investigated using high-temperature confocal scanning laser microscopy. Meanwhile, the high-temperature evolution of the phase fractions during the phase transition process was quantitatively analyzed based on the high-temperature expansion experiment using the peak separation method. Furthermore, the high-temperature properties variations of the casting slab during the α-ferrite sustained precipitation process were investigated with the Gleeble thermomechanical simulator. The results show that the film-like ferrite precipitated along the austenite grain boundaries at the initial stage of phase transition, then needle-like ferrite initiates rapid precipitation on film-like ferrite when the average thickness reaches 15~20 μm. Hot ductility reached a minimum at the ferrite phase fraction <i>f<sub>α</sub></i> = 10~15%, while high-temperature properties returned to a higher level after <i>f<sub>α</sub></i> > 40~45%. The appearance of a considerable amount of needle-like ferrite and grain refinement effectively improves the high-temperature properties with the α-ferrite precipitation process advances. |
| first_indexed | 2024-04-24T18:01:44Z |
| format | Article |
| id | doaj.art-9710da4df979478fafeadea2dffe9ac1 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-04-24T18:01:44Z |
| publishDate | 2024-03-01 |
| publisher | MDPI AG |
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| series | Metals |
| spelling | doaj.art-9710da4df979478fafeadea2dffe9ac12024-03-27T13:54:30ZengMDPI AGMetals2075-47012024-03-0114335010.3390/met14030350Effect Mechanism of <i>α</i>-Ferrite Sustained Precipitation on High-Temperature Properties in Continuous Casting for Peritectic SteelSongyuan Ai0Yifan Li1Mujun Long2Haohao Zhang3Dengfu Chen4Huamei Duan5Danbin Jia6Bingzhi Ren7Laboratory of Materials and Metallurgy, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaLaboratory of Materials and Metallurgy, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaLaboratory of Materials and Metallurgy, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaLaboratory of Materials and Metallurgy, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaLaboratory of Materials and Metallurgy, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaLaboratory of Materials and Metallurgy, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaLaboratory of Materials and Metallurgy, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaSchool of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, ChinaExploring the mechanism of the <i>α</i>-ferrite precipitation process on high-temperature properties plays an important guiding role in avoiding slab cracks and effectively regulating quality. In this work, in situ observation of the α-ferrite sustained precipitation behavior for peritectic steel during the austenitic phase transition process has been investigated using high-temperature confocal scanning laser microscopy. Meanwhile, the high-temperature evolution of the phase fractions during the phase transition process was quantitatively analyzed based on the high-temperature expansion experiment using the peak separation method. Furthermore, the high-temperature properties variations of the casting slab during the α-ferrite sustained precipitation process were investigated with the Gleeble thermomechanical simulator. The results show that the film-like ferrite precipitated along the austenite grain boundaries at the initial stage of phase transition, then needle-like ferrite initiates rapid precipitation on film-like ferrite when the average thickness reaches 15~20 μm. Hot ductility reached a minimum at the ferrite phase fraction <i>f<sub>α</sub></i> = 10~15%, while high-temperature properties returned to a higher level after <i>f<sub>α</sub></i> > 40~45%. The appearance of a considerable amount of needle-like ferrite and grain refinement effectively improves the high-temperature properties with the α-ferrite precipitation process advances.https://www.mdpi.com/2075-4701/14/3/350<i>α</i>-ferrite sustained precipitationphase fractionhot ductilityhigh-temperature strengtheffect mechanism |
| spellingShingle | Songyuan Ai Yifan Li Mujun Long Haohao Zhang Dengfu Chen Huamei Duan Danbin Jia Bingzhi Ren Effect Mechanism of <i>α</i>-Ferrite Sustained Precipitation on High-Temperature Properties in Continuous Casting for Peritectic Steel Metals <i>α</i>-ferrite sustained precipitation phase fraction hot ductility high-temperature strength effect mechanism |
| title | Effect Mechanism of <i>α</i>-Ferrite Sustained Precipitation on High-Temperature Properties in Continuous Casting for Peritectic Steel |
| title_full | Effect Mechanism of <i>α</i>-Ferrite Sustained Precipitation on High-Temperature Properties in Continuous Casting for Peritectic Steel |
| title_fullStr | Effect Mechanism of <i>α</i>-Ferrite Sustained Precipitation on High-Temperature Properties in Continuous Casting for Peritectic Steel |
| title_full_unstemmed | Effect Mechanism of <i>α</i>-Ferrite Sustained Precipitation on High-Temperature Properties in Continuous Casting for Peritectic Steel |
| title_short | Effect Mechanism of <i>α</i>-Ferrite Sustained Precipitation on High-Temperature Properties in Continuous Casting for Peritectic Steel |
| title_sort | effect mechanism of i α i ferrite sustained precipitation on high temperature properties in continuous casting for peritectic steel |
| topic | <i>α</i>-ferrite sustained precipitation phase fraction hot ductility high-temperature strength effect mechanism |
| url | https://www.mdpi.com/2075-4701/14/3/350 |
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