Influence of Boron on Initial Austenite Grain Size and Hot Deformation Behavior of Boron Microalloyed Steels
The initial austenite grain size of boron microalloyed steel with three different amounts of boron (20, 40, and 60 ppm) was investigated under different heating temperatures (1150, 1100, and 1050 °C), and hot compression tests of samples in a wide range of temperature (900–1100 °C) and strain rate (...
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MDPI AG
2015-11-01
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| Series: | Crystals |
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| Online Access: | http://www.mdpi.com/2073-4352/5/4/592 |
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| author | Yong-liang Gao Xiang-xin Xue He Yang |
| author_facet | Yong-liang Gao Xiang-xin Xue He Yang |
| author_sort | Yong-liang Gao |
| collection | DOAJ |
| description | The initial austenite grain size of boron microalloyed steel with three different amounts of boron (20, 40, and 60 ppm) was investigated under different heating temperatures (1150, 1100, and 1050 °C), and hot compression tests of samples in a wide range of temperature (900–1100 °C) and strain rate (0.1–10 s−1) were conducted. It was found that the initial austenite grain size increases with increasing temperature and boron content. The flow stress decreased with increasing boron content at lower strain rates. The flow stress constitutive equation of hot deformation was developed for the experimental steels; results showed that boron addition has the trend to reduce the hot deformation activation energy. The characteristic points of the flow curves were analyzed. Results revealed that the peak and critical stress decreased in response to an increase of boron content. The work-hardening behavior of both steels was investigated, and it was found that boron addition can decrease the work-hardening rate when strained at lower strain rates. On the contrary, peak and critical strains increased as boron content increased, indicating that boron has the ability to delay the onset of dynamic recrystallization. |
| first_indexed | 2024-04-11T22:33:09Z |
| format | Article |
| id | doaj.art-9fedd14c6a8d472a9c6f4879f7852b51 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-04-11T22:33:09Z |
| publishDate | 2015-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-9fedd14c6a8d472a9c6f4879f7852b512022-12-22T03:59:18ZengMDPI AGCrystals2073-43522015-11-015459260710.3390/cryst5040592cryst5040592Influence of Boron on Initial Austenite Grain Size and Hot Deformation Behavior of Boron Microalloyed SteelsYong-liang Gao0Xiang-xin Xue1He Yang2Liaoning Key Laboratories of Ecological Utilization Technology of Boron Resources and Boron Materials, Northeastern University, Shenyang 110819, ChinaLiaoning Key Laboratories of Ecological Utilization Technology of Boron Resources and Boron Materials, Northeastern University, Shenyang 110819, ChinaLiaoning Key Laboratories of Ecological Utilization Technology of Boron Resources and Boron Materials, Northeastern University, Shenyang 110819, ChinaThe initial austenite grain size of boron microalloyed steel with three different amounts of boron (20, 40, and 60 ppm) was investigated under different heating temperatures (1150, 1100, and 1050 °C), and hot compression tests of samples in a wide range of temperature (900–1100 °C) and strain rate (0.1–10 s−1) were conducted. It was found that the initial austenite grain size increases with increasing temperature and boron content. The flow stress decreased with increasing boron content at lower strain rates. The flow stress constitutive equation of hot deformation was developed for the experimental steels; results showed that boron addition has the trend to reduce the hot deformation activation energy. The characteristic points of the flow curves were analyzed. Results revealed that the peak and critical stress decreased in response to an increase of boron content. The work-hardening behavior of both steels was investigated, and it was found that boron addition can decrease the work-hardening rate when strained at lower strain rates. On the contrary, peak and critical strains increased as boron content increased, indicating that boron has the ability to delay the onset of dynamic recrystallization.http://www.mdpi.com/2073-4352/5/4/592boron-tread steelsinitial austenite grainhot deformationconstitutive equationdynamic recrystallization |
| spellingShingle | Yong-liang Gao Xiang-xin Xue He Yang Influence of Boron on Initial Austenite Grain Size and Hot Deformation Behavior of Boron Microalloyed Steels Crystals boron-tread steels initial austenite grain hot deformation constitutive equation dynamic recrystallization |
| title | Influence of Boron on Initial Austenite Grain Size and Hot Deformation Behavior of Boron Microalloyed Steels |
| title_full | Influence of Boron on Initial Austenite Grain Size and Hot Deformation Behavior of Boron Microalloyed Steels |
| title_fullStr | Influence of Boron on Initial Austenite Grain Size and Hot Deformation Behavior of Boron Microalloyed Steels |
| title_full_unstemmed | Influence of Boron on Initial Austenite Grain Size and Hot Deformation Behavior of Boron Microalloyed Steels |
| title_short | Influence of Boron on Initial Austenite Grain Size and Hot Deformation Behavior of Boron Microalloyed Steels |
| title_sort | influence of boron on initial austenite grain size and hot deformation behavior of boron microalloyed steels |
| topic | boron-tread steels initial austenite grain hot deformation constitutive equation dynamic recrystallization |
| url | http://www.mdpi.com/2073-4352/5/4/592 |
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