| Microstructure and grain boundary microanalysis of X70 pipeline steel |
| J. Wang; A. Atrens
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| 2003
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| 发表期刊 | Journal of Materials Science
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| ISSN | 0022-2461
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| 卷号 | 38期号:2页码:323-330 |
| 摘要 | Grain boundaries (GBs), particularly ferrite: ferrite GBs, of X70 pipeline steel were characterized using analytical electron microscopy (AEM) in order to understand its intergranular stress corrosion cracking (IGSCC) mechanism(s). The microstructure consisted of ferrite (alpha), carbides at ferrite GBs, some pearlite and some small precipitates inside the ferrite grains. The precipitates containing Ti, Nb, V and N were identified as complex carbo-nitrides and designated as (Ti, Nb, WC, N). The GB carbides occurred (1) as carbides along ferrite GBs, (2) at triple points, and (3) at triple points and extending along the three ferrite GBs. The GB carbides were Mn rich, were sometimes also Si rich, contained no micro-alloying elements (Ti, Nb, V) and also contained no N. It was not possible to measure the GB carbon concentration due to surface hydrocarbon contamination despite plasma cleaning and glove bag transfer from the plasma cleaner to the electron microscope. Furthermore, there may not be enough X-ray signal from the small amount of carbon at the GBs to enable measurement using AEM. However, the microstructure does indicate that carbon does segregate to alpha : alpha GBs during microstructure development. This is particularly significant in relation to the strong evidence in the literature linking the segregation of carbon at GBs to IGSCC. It was possible to measure all other elements of interest. There was no segregation at alpha : alpha GBs, in particular no S, P and N, and also no segregation of the micro-alloying elements, Ti, Nb and V. (C) 2003 Kluwer Academic Publishers. |
| 部门归属 | chinese acad sci, inst met res, state key lab corros sci, shenyang 110015, peoples r china. univ queensland, div mat, brisbane, qld 4072, australia.;wang, j (reprint author), chinese acad sci, inst met res, state key lab corros sci, shenyang 110015, peoples r china
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| 关键词 | Stress-corrosion Cracking
Segregation
Carbon
Apfim
Alloy
X52
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| URL | 查看原文
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| WOS记录号 | WOS:000179311100016
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://ir.imr.ac.cn/handle/321006/36045
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| 专题 | 中国科学院金属研究所
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推荐引用方式
GB/T 7714 |
J. Wang,A. Atrens. Microstructure and grain boundary microanalysis of X70 pipeline steel[J]. Journal of Materials Science,2003,38(2):323-330.
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| APA |
J. Wang,&A. Atrens.(2003).Microstructure and grain boundary microanalysis of X70 pipeline steel.Journal of Materials Science,38(2),323-330.
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| MLA |
J. Wang,et al."Microstructure and grain boundary microanalysis of X70 pipeline steel".Journal of Materials Science 38.2(2003):323-330.
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