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Microstructural Evolution and Mechanical Properties of Nb-Ti Microalloyed Pipeline Steel

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Abstract

The correlation between microstructures and mechanical properties of a Nb-Ti microalloyed pipeline steel was investigated. The results revealed that with decreasing the finish rolling temperature and the cooling stop temperature, the matrix microstructure was changed from quasi-polygonal ferrite to acicular ferrite, as a result of improvement of both strength and low temperature toughness. By means of electron backscattered diffraction observation, an effective acicular ferrite packet contained several low angle boundaries or subboundaries plates which made important contributions to improvement of strength. It was found that many fine quasi-polygonal ferrite grains with high angle boundaries as the toughening structure were introduced into the acicular ferrite matrix to refine effective grain size and improve the toughness.

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References

  1. Nagahama, Yamamoto S. High Performance Steel Pipes and Tubes Securing and Exploiting the Future Demands [J]. NKK Tech Rev, 2001, 88: 81.

    Google Scholar 

  2. Shiga, Hatomura, Kudoh J, et al. Development of Large Diameter High Strength Line Pipes for Low Temperature Services [J]. Kawasaki Steel Tech Rep, 1981, 4: 97.

    Google Scholar 

  3. ZHAO Ming-chun, YANG Ke, SHAN Yi-yin. The Effects of Thermo-Mechanical Control Process on Microstructures and Mechanical Properties of a Commercial Pipeline Steel [J]. Mater Sci Eng, 2002, 335A: 14.

    Google Scholar 

  4. Hwang, Kim Y, Lee S. Effective Grain Size and Charpy Impact Properties of High-Toughness X70 Pipeline Steels [J]. Metall Mater Trans, 2005, 36A: 2107.

    Article  Google Scholar 

  5. Kim Y, Kim S, Lim Y, et al. Effect of Microstructure on the Yield Ratio and Low Temperature Toughness of Line-pipe Steels [J]. ISIJ Int, 2002, 42: 1571.

    Article  Google Scholar 

  6. American Petroleum Institute. API Specification 5L-2007 Specification for Line Pipe [S]. Washington: API, 2007.

    Google Scholar 

  7. Krauss, Thompson S W. Ferritic Microstructures in Continuously Cooled Low- and Ultra-Low Carbon Steels [J], ISIJ Int, 1995, 35: 937.

    Article  Google Scholar 

  8. Shanmugam, Misrardk, Hartmann, et al. Microstructure of High Strength Niobium-Containing Pipeline Steel [J]. Mater Sci Eng, 2006, 441A: 215.

    Article  Google Scholar 

  9. Shibata, Asakura K. Transformation Behavior and Micro-structures in Ultra-Low Carbon Steels [J]. ISIJ Int, 1995, 35: 982.

    Article  Google Scholar 

  10. Smith Y, Coldren A, Cryderman R L. Mn-Mo-Nb Acicu-lar Ferrite Steels With High Strength and Toughness [C] // Toward Improved Ductility and Toughness. Tokyo: Climax Molybdenum Company (Japan) Ltd, 1972: 119.

    Google Scholar 

  11. Xiao F, Liao, Shan Y, et al. Challenge of Mechanical Properties of an Acicular Ferrite Pipeline Steel [J]. Mater Sci Eng, 2006, 431 A: 41.

    Article  Google Scholar 

  12. Wang, Yan, Yang K. Relation Among Rolling Parameters, Microstructures and Mechanical Properties in an Acicular Ferrite Pipeline Steel [J]. Mater and Design, 2009, 30: 3436.

    Article  Google Scholar 

  13. Gourgues A, Flower H, Lindler T C. Electron Backsca-ttering Diffraction Study of Acicular Ferrite, Bainite, and Martensite Steel Microstructure [J]. Mater Sci Tech, 2000, 16: 26.

    Article  Google Scholar 

  14. Fuentes M, Mendia A, Gutierrez I. Analysis of Different Acicular Ferrite Microstructures in Low-Carbon Steels by Electron Backscattered Diffraction. Study of Their Toughness Behavior [J]. Metall Mater Trans, 2003, 34A: 2505.

    Article  Google Scholar 

  15. Kim Y, Lee, Kim N J. Transformation Behavior and Microstructure Characteristics of Acicular Ferrite in Linepipe Steels [J]. Mater Sci Eng, 2008, 478: 361.

    Article  Google Scholar 

  16. Mabuchi, Uemori, Fujioka M. The Role of Mn Depletion in Intra-Granular Ferrite Transformation in the Heat Affected Zone of Welded Joints With Large Heat Input in Structural Steels [J]. ISIJ Int, 1996, 36: 1406.

    Article  Google Scholar 

  17. Honeycombe R W, Pickering F B. Ferrite and Bainite in Alloy Steels [J]. Metal Trans, 1972, 3A: 1099.

    Article  Google Scholar 

  18. Edmonds D, Cochrane R C. Structure-Property Relationships in Bainitic Steels [J]. Metell Trans, 1990, 21A: 1527.

    Article  Google Scholar 

  19. Nohava, Hausild, Karlik M. Electron Backscattering Diffraction Analysis of Secondary Cleavage Cracks in a Reactor Pressure Vessel Steel [J]. Mater Character, 2003, 49: 211.

    Article  Google Scholar 

  20. WANG Wei, SHAN Yi-yin, YANG Ke. Study of High Strength Pipeline Steels With Different Microstructures [J]. Mater Sci Eng, 2009, 502A: 38.

    Google Scholar 

  21. Gianetto J, Braid J E, Bowker J, et al. Heat-Affected Zone Toughness of a TMCP Steel Designed for Low-Temperature Applications [J]. ASME, 1997, 119. 134.

    Google Scholar 

  22. Kim Y, Shin S, Lee, et al. Effects of Molybdenum and Vanadium Addition on Tensile and Charpy Impact Properties of API X70 Linepipe Steels [J]. Metall Mater Trans, 2007, 38A: 1731.

    Article  Google Scholar 

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Authors and Affiliations

  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, Liaoning, 110004, China

    Liang-yun Lan (Doctor Candidate), Chun-lin Qiu, De-wen Zhao & Xiu-hua Gao

Authors
  1. Liang-yun Lan
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  2. Chun-lin Qiu
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  3. De-wen Zhao
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  4. Xiu-hua Gao
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Correspondence to Liang-yun Lan.

Additional information

Foundation Item: Item Sponsored by National Natural Science Foundation of China (51074052); Fundamental Research Funds for Central Universities of China (N100607001)

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Lan, Ly., Qiu, Cl., Zhao, Dw. et al. Microstructural Evolution and Mechanical Properties of Nb-Ti Microalloyed Pipeline Steel. J. Iron Steel Res. Int. 18, 57–63 (2011). https://doi.org/10.1016/S1006-706X(11)60024-1

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  • DOI: https://doi.org/10.1016/S1006-706X(11)60024-1

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