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Microstructure Evolution and Mechanical Property of Low-Alloy Steel Used for Armor Layer of Flexible Pipe During Thermomechanical Process and Hot Rolling Process

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Abstract

In this paper, the thermomechanical process and hot rolling process were carried out to study the microstructure evolution and mechanical property of low-alloy steel used for armor layer of flexible pipes by analyzing continuous cooling transformation curve, microstructure morphology, grain characteristics, and strength. The experimental results indicate that deformation process promotes phase transformation process of both ferrite and bainite and induces the formation of fine grain. The density of low-angle grain boundary rises with increasing cooling rate. The dislocation concentration in grain becomes larger with the extended cooling rate. The microstructure of hot-rolled specimen consists of polygonal ferrite and granular bainite, which is consistent with one of the deformed specimens with similar cooling rate in dilatometer. The microstructure evolution provides effective data fundament for hot rolling process.

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Acknowledgments

The authors are grateful for financial support from Doctoral Scientific Research Foundation of Jiangsu University of Science and Technology (1062931702), National High Technology Research and Development Program of China (2015AA03A501), Natural Science Foundation of China (NSFC, 51305285, 51605203), and Natural Science Foundation of Jiangsu Province (BK20180984).

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Authors and Affiliations

  1. School of Material Science and Engineering and National Demonstration Center for Experimental Materials Science and Engineering Education, Jiangsu University of Science and Technology, Zhenjiang, 212003, China

    Zhenguang Liu & Xiaowei Zhou

  2. School of Mechanical Engineering, Tongling University, Tongling, 244061, China

    Shoudong Chen

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

    Xiuhua Gao, Guanqiao Su, Linxiu Du & Jianping Li

  4. Shagang School of Iron and Steel, Soochow University, Suzhou, 215021, China

    Xiaonan Wang

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  1. Zhenguang Liu
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Correspondence to Zhenguang Liu.

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Liu, Z., Chen, S., Gao, X. et al. Microstructure Evolution and Mechanical Property of Low-Alloy Steel Used for Armor Layer of Flexible Pipe During Thermomechanical Process and Hot Rolling Process. J. of Materi Eng and Perform 28, 107–116 (2019). https://doi.org/10.1007/s11665-018-3723-x

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  • DOI: https://doi.org/10.1007/s11665-018-3723-x

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