| Precipitation behaviors of X70 acicular ferrite pipeline steel |
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| 作者姓名： | Hao Yu Yi Sun Qixiang Chen Haitao Jiang Lihong Zhang |
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| 作者单位： | [1]Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China [2]Jinan Iron ＆ Steel Group Co., Jinan 250101, China |
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| 摘 要： | The morphology, structure, and chemical composition of precipitates in the final microstructure of Nb-V-Ti microalloyed X70 acicular ferrite pipeline steel were investigated using transmission electron microscopy （TEM） and energy dispersive X-ray spectroscopy （EDS）. Precipitates observed by TEM can be classified into two groups. The large precipitates are complex compounds that comprise square-shaped TiN precipitate as core with fine Nb-containing precipitate nucleated on pre-existing TiN precipitate as caps on one or more faces at high temperature. In contrast, the fine and spherical Nb carbides and/or carbonitrides precipitate heterogeneously on dislocations and sub-boundaries at low temperature. From the analysis in terms of thermodynamics, EDS and chemical cornposition of the steel, NbC precipitation is considered to be the predominant precipitation behavior in the tested steel under the processing conditions of this research.
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| 关 键 词： | 钢铁管道 针状铁氧体 微结构 碳氮化 沉积行为 热力学 |
| 收稿时间： | 2006-01-26 |
Precipitation behaviors of X70 acicular ferrite pipeline steel |
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| Hao Yu Yi Sun Qixiang Chen Haitao Jiang Lihong Zhang.Precipitation behaviors of X70 acicular ferrite pipeline steel[J].Journal of University of Science and Technology Beijing,2006,13(6):523-527. |
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| Authors: | Hao Yu Yi Sun Qixiang Chen Haitao Jiang Lihong Zhang |
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| Affiliation: | 1. Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China
2. Jinan Iron & Steel Group Co., Jinan 250101, China |
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| Abstract: | The morphology, structure, and chemical composition of precipitates in the final microstructure of Nb-V-Ti microalloyed X70 acicular ferrite pipeline steel were investigated using transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS). Precipitates observed by TEM can be classified into two groups. The large precipitates are complex compounds that comprise square-shaped TiN precipitate as core with fine Nb-containing precipitate nucleated on pre-existing TiN precipitate as caps on one or more faces at high temperature. In contrast, the fine and spherical Nb carbides and/or carbonitrides precipitate heterogene-ously on dislocations and sub-boundaries at low temperature. From the analysis in terms of thermodynamics, EDS and chemical composition of the steel, NbC precipitation is considered to be the predominant precipitation behavior in the tested steel under the processing conditions of this research. |
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| Keywords: | pipeline steel acicular ferrite microstructure carbonitride precipitation behavior thermodynamics |
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