| Microstructure evolution during reheating of a Nb-bearing steel I. Metallographic examination |
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| 引用本文： | Shanwu Yang Enlong Dong Huibin Wu Chengjia Shang Xuemin Wang Xinlai He. Microstructure evolution during reheating of a Nb-bearing steel I. Metallographic examination[J]. 北京科技大学学报(英文版), 2005, 12(4): 317-320 |
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| 作者姓名： | Shanwu Yang Enlong Dong Huibin Wu Chengjia Shang Xuemin Wang Xinlai He |
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| 作者单位： | [1]Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China [2]Anshan Iron ＆ Steel Group Corporation, Anshan 114003, China |
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| 摘 要： | Cooled in water after the isothermal relaxation of deformed austenite for different timea, a Nb-bearing microalloyed steel always exhibits synthetic microstructures of bainitic ferrite, granular bainite and acicular ferrite. When these samples were reheated to and held at 650 or 700℃, the non-equilibrious microstructures tend to evolve into equilibrious ones. The sample relaxed for 60 s displays the highest thermostability, while the microstructure evolution is the quickest in the sample relaxed for 1000 s even though it is the softest before reheating. Softening is not a single process occurring during reheating, in which the hardness fluctuates with time. There are two peaks in the hardness-time curve of each sample having undergone relaxation, while a single peak occurs in the curve of the sample having not been relaxed. Pre-strain accelerates the evolution process. These results indicate that the thermostability of microstructures is determined by their history of formation to a considerable degree.
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| 关 键 词： | 贝氏体钢 金相学 微观结构 机械性质 物理性质 |
| 收稿时间： | 2004-08-15 |
Microstructure evolution during reheating of a Nb-bearing steel I. Metallographic examination |
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| Shanwu;Yang;Enlong;Dong;Huibin;Wu;Chengjia;Shang;Xuemin;Wang;Xinlai;He. Microstructure evolution during reheating of a Nb-bearing steel I. Metallographic examination[J]. Journal of University of Science and Technology Beijing, 2005, 12(4): 317-320 |
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| Authors: | Shanwu Yang Enlong Dong Huibin Wu Chengjia Shang Xuemin Wang Xinlai He |
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| Abstract: | |
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| Keywords: | evolution microstructure bainite reheating |
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