The Effect of Cooling Rate on the Microstructure Evolution and Mechanical Properties of Ti-Microalloyed Steel Plates
Ti-bearing microalloyed steel plates with a thickness of 40 mm were subjected to ultra-fast cooling (UFC) and traditional accelerate cooling after hot-rolling, aiming to investigate the effect of cooling rate on the microstructure and mechanical properties homogeneity, and thus obtain thick plates w...
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MDPI AG
2022-02-01
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| author | Xiaolin Li Qian Li Haozhe Li Xiangyu Gao Xiangtao Deng Zhaodong Wang |
| author_facet | Xiaolin Li Qian Li Haozhe Li Xiangyu Gao Xiangtao Deng Zhaodong Wang |
| author_sort | Xiaolin Li |
| collection | DOAJ |
| description | Ti-bearing microalloyed steel plates with a thickness of 40 mm were subjected to ultra-fast cooling (UFC) and traditional accelerate cooling after hot-rolling, aiming to investigate the effect of cooling rate on the microstructure and mechanical properties homogeneity, and thus obtain thick plates with superior and homogeneous mechanical properties. Yield strength, tensile strength, and elongation were 642 MPa, 740 MPa, 19.2% and 592 MPa, 720 MPa and 16.7%, respectively, in the surface and mid-thickness of the steel with ultra-fast cooling, while in the steel with traditional accelerate cooling, 535 MPa, 645 MPa, 23.4% and 485 MPa, 608 MPa, 16.2% were obtained in the surface and mid-thickness of the plate. The yield strength has been greatly improved after UFC, for the refinement of grain and precipitates produced by UFC. In addition, the equivalent grain size and precipitates size in the thick plate with UFC are homogeneous in the thickness direction, leading to uniform mechanical properties. The crystallographic characteristics of different precipitates have been studied. The precipitates formed in the austenite deformation stage obey Kurdjumov–Sachs orientation relationship with the ferrite matrix, while the fine precipitates formed in the ferrite obey [112]<sub>MC</sub>//[110]<sub>α</sub> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mrow><mo>(</mo><mover><mn>1</mn><mo>¯</mo></mover><mover><mn>1</mn><mo>¯</mo></mover><mn>1</mn><mo>)</mo></mrow></mrow><mrow><mi>MC</mi></mrow></msub></mrow></semantics></math></inline-formula>//<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mrow><mo>(</mo><mover><mn>1</mn><mo>¯</mo></mover><mn>12</mn><mo>)</mo></mrow></mrow><mrow><mi>α</mi></mrow></msub></mrow></semantics></math></inline-formula> orientation relationship with the ferrite matrix. |
| first_indexed | 2024-03-09T21:32:25Z |
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| id | doaj.art-673ce37b2181487496e0a0c8e7d0ee58 |
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| spelling | doaj.art-673ce37b2181487496e0a0c8e7d0ee582023-11-23T20:52:26ZengMDPI AGMaterials1996-19442022-02-01154138510.3390/ma15041385The Effect of Cooling Rate on the Microstructure Evolution and Mechanical Properties of Ti-Microalloyed Steel PlatesXiaolin Li0Qian Li1Haozhe Li2Xiangyu Gao3Xiangtao Deng4Zhaodong Wang5Center of Advanced Lubrication and Seal Materials, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, ChinaCenter of Advanced Lubrication and Seal Materials, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, ChinaCenter of Advanced Lubrication and Seal Materials, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, ChinaAnalytical & Testing Center, Northwestern Polytechnical University, Xi’an 710072, ChinaState Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, ChinaState Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, ChinaTi-bearing microalloyed steel plates with a thickness of 40 mm were subjected to ultra-fast cooling (UFC) and traditional accelerate cooling after hot-rolling, aiming to investigate the effect of cooling rate on the microstructure and mechanical properties homogeneity, and thus obtain thick plates with superior and homogeneous mechanical properties. Yield strength, tensile strength, and elongation were 642 MPa, 740 MPa, 19.2% and 592 MPa, 720 MPa and 16.7%, respectively, in the surface and mid-thickness of the steel with ultra-fast cooling, while in the steel with traditional accelerate cooling, 535 MPa, 645 MPa, 23.4% and 485 MPa, 608 MPa, 16.2% were obtained in the surface and mid-thickness of the plate. The yield strength has been greatly improved after UFC, for the refinement of grain and precipitates produced by UFC. In addition, the equivalent grain size and precipitates size in the thick plate with UFC are homogeneous in the thickness direction, leading to uniform mechanical properties. The crystallographic characteristics of different precipitates have been studied. The precipitates formed in the austenite deformation stage obey Kurdjumov–Sachs orientation relationship with the ferrite matrix, while the fine precipitates formed in the ferrite obey [112]<sub>MC</sub>//[110]<sub>α</sub> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mrow><mo>(</mo><mover><mn>1</mn><mo>¯</mo></mover><mover><mn>1</mn><mo>¯</mo></mover><mn>1</mn><mo>)</mo></mrow></mrow><mrow><mi>MC</mi></mrow></msub></mrow></semantics></math></inline-formula>//<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mrow><mo>(</mo><mover><mn>1</mn><mo>¯</mo></mover><mn>12</mn><mo>)</mo></mrow></mrow><mrow><mi>α</mi></mrow></msub></mrow></semantics></math></inline-formula> orientation relationship with the ferrite matrix.https://www.mdpi.com/1996-1944/15/4/1385thermomechanical controlled processing (TMCP)ultra-fast cooling systemmicrostructure evolutionprecipitation behaviormechanical properties |
| spellingShingle | Xiaolin Li Qian Li Haozhe Li Xiangyu Gao Xiangtao Deng Zhaodong Wang The Effect of Cooling Rate on the Microstructure Evolution and Mechanical Properties of Ti-Microalloyed Steel Plates Materials thermomechanical controlled processing (TMCP) ultra-fast cooling system microstructure evolution precipitation behavior mechanical properties |
| title | The Effect of Cooling Rate on the Microstructure Evolution and Mechanical Properties of Ti-Microalloyed Steel Plates |
| title_full | The Effect of Cooling Rate on the Microstructure Evolution and Mechanical Properties of Ti-Microalloyed Steel Plates |
| title_fullStr | The Effect of Cooling Rate on the Microstructure Evolution and Mechanical Properties of Ti-Microalloyed Steel Plates |
| title_full_unstemmed | The Effect of Cooling Rate on the Microstructure Evolution and Mechanical Properties of Ti-Microalloyed Steel Plates |
| title_short | The Effect of Cooling Rate on the Microstructure Evolution and Mechanical Properties of Ti-Microalloyed Steel Plates |
| title_sort | effect of cooling rate on the microstructure evolution and mechanical properties of ti microalloyed steel plates |
| topic | thermomechanical controlled processing (TMCP) ultra-fast cooling system microstructure evolution precipitation behavior mechanical properties |
| url | https://www.mdpi.com/1996-1944/15/4/1385 |
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