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| Effect of deformation and cooling rate on the transformation behavior and microstructure of X70 steels | |
| 引用本文： | Zhiping Zhao Zhenmin Wang Hongmei Zhang Lifeng Qiaol. Effect of deformation and cooling rate on the transformation behavior and microstructure of X70 steels[J]. 北京科技大学学报(英文版), 2007, 14(5): 410-413. DOI: 10.1016/S1005-8850(07)60081-4 |
| 作者姓名： | Zhiping Zhao Zhenmin Wang Hongmei Zhang Lifeng Qiaol |
| 作者单位： | Zhiping Zhao1，2)，Zhenmin Wang3)，Hongmei Zhang3)，Lifeng Qiao1) 1) Angang Steel Company Limited，Anshan 114008，China 2) Material Science and Engineering School，University of Science and Technology Beijing，Beijing 100083，China 3) School of Material Science and Engineering，University of Science and Technology Liaoning，Anshan 114044，China |
| 摘 要： | The effects of the deformation in the non-recrystallization region of austenite and the cooling rate on the transformation behavior and microstructure of low-carbon low-alloy steel for pipeline application were studied on the thermal-mechanical simulator Gleeble-1500. It was shown that an increase in deformation amount can greatly increase the nucleation site of ferrite when deformed in the non-recrystallization region of austenite, and an increase in nucleation ratio can greatly refine grains. When the cooling rate is accelerated, the driving force of nucleation is increased and the nucleation rate also improves. Ultra-refine grains can be obtained by controlled rolling. The high density of ferrite nucleus, which forms along the austenite grain boundary, twin interface, and deforma- tion band are introduced in the matrix of austenite by the control of hot rolling, after which the microstructure can be refined. It was found that the acicular ferrite has a very fine sub-structure, high dislocation density, and a thin slab with ultra-fine grains. Small M/A islands and cementite are precipitated on the matrix of the slabs by the analysis technique of TEM and SEM. |
| 关 键 词： | 钢管 针状铁氧体 微结构 冷却技术 |
| 收稿时间： | 2006-09-12 |
| 修稿时间： | 2006-09-12 |
Effect of deformation and cooling rate on the transformation behavior and microstructure of X70 steels |
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| Zhiping Zhao,Zhenmin Wang,Hongmei Zhang,Lifeng Qiao. Effect of deformation and cooling rate on the transformation behavior and microstructure of X70 steels[J]. Journal of University of Science and Technology Beijing, 2007, 14(5): 410-413. DOI: 10.1016/S1005-8850(07)60081-4 | |
| Authors: | Zhiping Zhao Zhenmin Wang Hongmei Zhang Lifeng Qiao |
| Affiliation: | 1. Angang Steel Company Limited, Anshan 114008, China;Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China 2. School of Material Science and Engineering, University of Science and Technology Liaoning, Anshan 114044, China 3. Angang Steel Company Limited, Anshan 114008, China |
| Abstract: | The effects of the deformation in the non-recrystallization region of austenite and the cooling rate on the transformation behavior and microstructure of low-carbon low-alloy steel for pipeline application were studied on the thermal-mechanical simulator Gleeble-1500. It was shown that an increase in deformation amount can greatly increase the nucleation site of ferrite when deformed in the non-recrystallization region of austenite, and an increase in nucleation ratio can greatly refine grains. When the cooling rate is accelerated, the driving force of nucleation is increased and the nucleation rate also improves. Ultra-refine grains can be obtained by controlled rolling. The high density of ferrite nucleus, which forms along the austenite grain boundary, twin interface, and deformation band are introduced in the matrix of austenite by the control of hot rolling, after which the microstructure can be refined. It was found that the acicular ferrite has a very fine sub-structure, high dislocation density, and a thin slab with ultra-fine grains. Small M/A islands and cementite are precipitated on the matrix of the slabs by the analysis technique of TEM and SEM. |
| Keywords: | pipeline steel acicular ferrite dislocation M/A island |
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