| Study on M／A islands in pipeline steel X70 |
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| 引用本文： | ChunmingWang XingfangWu JieLiu Ning＇anXu.Study on M／A islands in pipeline steel X70[J].北京科技大学学报(英文版),2005,12(1):43-47. |
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| 作者姓名： | ChunmingWang XingfangWu JieLiu Ning＇anXu |
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| 作者单位： | [1]MaterialsScienceandEngineeringSchool,UniversityofScienceandTechnologyBeijing,Beijing100083,China／／AnshanIron＆SteelGroupCorporation,Anshan114021,China [2]MaterialsScienceandEngineeringSchool,UniversityofScienceandTechnologyBeijing,Beijing100083,China [3]AnshanIron＆SteelGroupCorporation,Anshan114021,China |
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| 摘 要： | The free structure of M/A islands in pipeline steel X70 has been studied by transmission electron microscope (TEM). It is shown that the M/A islands are about 1-2 μm in size and distribute at the grain boundary of irregular massive ferrite or acicular ferrite in the microstructure of the steel undergoing TMCP (thermo-mechanical controlled processing). The analysis of diffraction contrast shows that the M/A islands consist of retained austenite and some martensite lamellae different in size and orientation. The microtwinning and midrib exist in the lamella of lenticular martensite, which exhibit the typical character of high-carbon martensite. The influences of TMCP parameters on M/A islands have been studied carefully. With the increase of the cooling speed, the amount of M/A islands decrease slightly and the morphology of M/A islands changes to thin dispersive short bars from thick irregular long strips.
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| 关 键 词： | 钢管 微量分析方法 强度 石油天然气管道 西气东输工程 |
Study on M/A islands in pipeline steel X70 |
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| Chunming Wang,Xingfang WU,Jie Liu,Ning'an Xu.Study on M/A islands in pipeline steel X70[J].Journal of University of Science and Technology Beijing,2005,12(1):43-47. |
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| Authors: | Chunming Wang Xingfang WU Jie Liu Ning'an Xu |
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| Abstract: | The fine structure of M/A islands in pipeline steel X70 has been studied by transmission electron microscope (TEM). It is shown that the M/A islands are about 1-2 μm in size and distribute at the grain boundary of irregular massive ferrite or acicular ferrite in the microstructure of the steel undergoing TMCP (thermo-mechanical controlled processing). The analysis of diffraction contrast shows that the M/A islands consist of retained austenite and some martensite lamellae different in size and orientation. The microtwinning and midrib exist in the lamella of lenticular martensite, which exhibit the typical character of high-carbon martensite. The influences of TMCP parameterson M/A islands have been studied carefully. With the increase of the cooling speed, the amount of M/A islands decrease slightly and the morphology of M/A islands changes to thin dispersive short bars from thick irregular long strips. |
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| Keywords: | pipeline steel X70 M/A islands electron microanalysis |
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