Effect of Ultra-Fast Cooling on Microstructure and Performance of Thick X80 Pipeline Steel

doi:10.11901/1005.3093.2015.304

Chinese Journal of Materials Research

2016, Vol. 30

Issue (8): 620-626 DOI: 10.11901/1005.3093.2015.304

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Effect of Ultra-Fast Cooling on Microstructure and Performance of Thick X80 Pipeline Steel

NIU Tao^1,^*, WU Xinlang², AN Chenggang¹, JIANG Yongwen¹, ZHANG Caixia², YU Chen², DAI Xiaoli¹

1. Shougang Research Institute of Technology, Beijing 100043, China
2. Shougang Qian'an Iron &Steel Co. Ltd, Qian'an 064404, China

Cite this article:

NIU Tao, WU Xinlang, AN Chenggang, JIANG Yongwen, ZHANG Caixia, YU Chen, DAI Xiaoli. Effect of Ultra-Fast Cooling on Microstructure and Performance of Thick X80 Pipeline Steel. Chinese Journal of Materials Research, 2016, 30(8): 620-626.

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Abstract

Dynamic phase transformation behavior and CCT curves of 22 mm thick X80 pipeline steel were investigated using Gleeble simulator. Comparative analysis of microstructure, mechanical properties and precipitation behavior was carried out for the steel cooled by different ways. Results reveal that even under cooling rate of 40℃/s, the microstructure still consists of mainly the refined lath bainite (LB), while the end phase of transformation temperature reaches about 400℃. The strength of coil increases without obvious change in toughness due to ultra fast cooling. The proportion of Quasi-polygnoal ferrite (QF) reduces as well as M/A island, while that of lath bainite (LB) rises instead. Precipitation of Nb(C, N) has been inhibited by ultra fast cooling after rolling, which increases the proportion of precipitate in α-Fe with more refined particle size and promotes the precipitation strengthening effect.

Key words: metallic materials pipeline steel ultra-fast cooling phase transformation microstructure M/A island precipitation

Received: 12 October 2015

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	Tao NIU
	Xinlang WU
	Chenggang AN
	Yongwen JIANG
	Caixia ZHANG
	Chen YU
	Xiaoli DAI

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.304 OR https://www.cjmr.org/EN/Y2016/V30/I8/620

Table 1 Chemical composition of X80 pipeline steel (mas fraction, %)

Fig.1 Process of dynamic CCT experiment

Fig.2 Microstructures obtained with different cooling rates (a) 0.5℃/s; (b) 10℃/s; (c) 20℃/s; (d) 40℃/s

Fig.3 Continuous cooling transformation curves

Table 2 Mechanical properties of X80 pipeline steel produced with different cooling technology

Fig.4 Microstructures obtained with different cooling process (a), (b) laminar cooling; (c), (d) Super fast cooling

Fig.5 M/A island morphology obtained with different cooling process (a) laminar cooling; (b) Super fast cooling

Fig.6 Precipitation particles obtained with different cooling process (a), (b) laminar cooling; (c), (d) Super fast cooling

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