Effect of microstructure on the low temperature toughness of high strength pipeline steels

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• 作者：Yan-ping Zeng (1)
  Peng-yu Zhu (1)
  Ke Tong (2)
  
  1. School of Materials Science and Engineering ; University of Science and Technology Beijing ; Beijing ; 100083 ; China
  2. CNPC Tubular Goods Research Institute ; Xi鈥檃n ; 710065 ; China
  
• 关键词：high strength pipe steels ; microstructure ; low temperature ; toughness ; influencing factors
• 刊名：International Journal of Minerals, Metallurgy, and Materials
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：22
• 期：3
• 页码：254-261
• 全文大小：3,707 KB
• 参考文献：1. Reip, CP, Shanmugam, S, Misra, RDK (2006) High strength microalloyed CMn(V-Nb-Ti) and CMn(V-Nb) pipeline steels processed through CSP thin-slab technology: microstructure, precipitation and mechanical properties. Mater. Sci. Eng. A 424: pp. 307 CrossRef
  2. Shin, SY, Hwang, B, Lee, S, Kang, KB (2007) Effects of notch shape and specimen thickness on drop-weight tear test properties of API X70 and X80 line-pipe steels. Metall. Mater. Trans. A 38: pp. 537 CrossRef
  3. Hwang, B, Lee, S, Kim, YM, Kim, NJ, Yoo, JY, Woo, CS (2004) Analysis of abnormal fracture occurring during drop-weight tear test of high-toughness line-pipe steel. Mater. Sci. Eng. A 368: pp. 18 CrossRef
  4. Shukla, R, Das, SK, Kumar, B R, Ghosh, SK, Kundu, S, Chatterjee, S (2012) An ultra-low carbon, thermomechanically controlled processed microalloyed steel: microstructure and mechanical properties. Metall. Mater. Trans. A 43: pp. 4835 CrossRef
  5. Wang, W, Yan, W, Zhu, L, Hu, P, Shan, YY, Yang, K (2009) Relation among rolling parameters, microstructures and mechanical properties in an acicular ferrite pipeline steel. Mater. Des. 30: pp. 3436 matdes.2009.03.026" target="_blank" title="It opens in new window">CrossRef
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  10. Hwang, B, Lee, S, Kim, YM, Kim, NJ, Yoo, JY (2005) Correlation of rolling condition, microstructure, and low-temperature toughness of X70 pipeline steels. Metall. Mater. Trans. A 36: pp. 1793 CrossRef
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  14. D铆az-Fuentes, M, Iza-Mendia, A, Guti茅rrez, I (2003) Analysis of different acicular ferrite microstructures in low-carbon steels by electron backscattered diffraction: study of their toughness behavior. Metall. Mater. Trans. A 34: pp. 2505 CrossRef
  15. Hwang, B, Kim, YG, Lee, S, Kim, YM, Kim, NJ, Yoo, JY (2005) Effective grain size and Charpy impact properties of high-toughness X70 pipeline steels. Metall. Mater. Trans. A 36: pp. 2107 CrossRef
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Mineral Resources
  
• 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
• ISSN：1869-103X

文摘

Microstructure observations and drop-weight tear test were performed to study the microstructures and mechanical properties of two kinds of industrial X70 and two kinds of industrial X80 grade pipeline steels. The effective grain size and the fraction of high angle grain boundaries in the pipeline steels were investigated by electron backscatter diffraction analysis. It is found that the low temperature toughness of the pipeline steels depends not only on the effective grain size, but also on other microstructural factors such as martensite-austenite (MA) constituents and precipitates. The morphology and size of MA constituents significantly affect the mechanical properties of the pipeline steels. Nubby MA constituents with large size have significant negative effects on the toughness, while smaller granular MA constituents have less harmful effects. Similarly, larger Ti-rich nitrides with sharp corners have a strongly negative effect on the toughness, while fine, spherical Nb-rich carbides have a less deleterious effect. The low temperature toughness of the steels is independent of the fraction of high angle grain boundaries.