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Effects of Ultra Fast Cooling on Microstructure and Mechanical Properties of Pipeline Steels

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Abstract

X70 (steel A) and X80 (steel B) pipeline steels were fabricated by ultra fast cooling (UFC). UFC processing improves not only ultimate tensile strength (UTS), yield strength (YS), yield ratio (YS/UTS), and total elongation of both steels, but also their Charpy absorbed energy (A K) as well. The microstructures of both steels were all composed of quasi polygonal, acicular ferrite (AF), and granular bainite. MA islands (the mixtures of brittle martensite and residual austenite) are more finely dispersed in steel B, and the amount of AF in steel B is much more than that in steel A. The strength of steel B is higher than that of steel A. This is mainly attributed to the effect of the ferrite grain refinement which is resulted from UFC processing. The finely dispersed MA islands not only provide dispersion strengthening, but also reduce loss of impact properties to pipeline steels. UFC produces low-temperature transformation microstructures containing larger amounts of AFs. The presence of AF is a crucial factor in achieving desired mechanical properties for both steels. It is suggested that the toughness of the experimental steel increases with increasing the amount of AF.

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Acknowledgment

This work was supported by the Natural Science Foundation of China (Grant No. 51234002). The authors are grateful to the staff of Qinhuangdao Shouqin Metal Materials Co, Ltd.

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Authors and Affiliations

  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, China

    Yong Tian, Zhao-dong Wang & Guo-dong Wang

  2. Department of Rolling, Qinhuangdao Shouqin Metal Materials Co, Ltd, Qinhuangdao, 066326, China

    Qun Li

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  1. Yong Tian
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  2. Qun Li
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Correspondence to Yong Tian.

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Tian, Y., Li, Q., Wang, Zd. et al. Effects of Ultra Fast Cooling on Microstructure and Mechanical Properties of Pipeline Steels. J. of Materi Eng and Perform 24, 3307–3314 (2015). https://doi.org/10.1007/s11665-015-1605-z

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  • DOI: https://doi.org/10.1007/s11665-015-1605-z

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