Effect of Thermo-mechanical Control Process on Microstructure of High Strength X100 Pipeline Steel

doi:10.11901/1005.3093.2013.329

Chinese Journal of Materials Research

2014, Vol. 28

Issue (1): 51-58 DOI: 10.11901/1005.3093.2013.329

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Effect of Thermo-mechanical Control Process on Microstructure of High Strength X100 Pipeline Steel

Linna DUAN^1,^2,^**(

),Yu CHEN³,Qingyou LIU²,Shujun JIA²,Chengchang JIA¹

1. School of Material Science and Engineering, University of Science and Technology Beijing, Beijing 100083
2. Institute for Engineering Steel, Central Iron and Steel Research Institute, Beijing 100081
3. China Petroleum Engineering and Construction Corporation, Beijing 100120

Cite this article:

Linna DUAN,Yu CHEN,Qingyou LIU,Shujun JIA,Chengchang JIA. Effect of Thermo-mechanical Control Process on Microstructure of High Strength X100 Pipeline Steel. Chinese Journal of Materials Research, 2014, 28(1): 51-58.

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Abstract

The transformation of undercooling austenite in a X100 pipeline steel was investigated by means of thermal simulation test. Based on the obtained results, a thermo-mechanical control process (TMCP) by which a mixed microstructure mainly consisted of granular bainite and lath bainite can be obtained has been proposed and effects of finish rolling deformation amount, cooling rate and final cooling temperature on microstructure have been analyzed. The results show that the microstructure of tested steel gradually refines and the volume fraction of lath bainite decreases with the increase of deformation amount. With the increase of cooling rate and the decrease of final cooling temperature, microstructure refines and volume fraction of lath bainite increases obviously. High volume fraction of lath bainite in microstructure is good for high strength. However, excessively high volume fraction of lath bainite and M/A islands with the shape of acicular have harmful influences on toughness.

Key words: metallic materials X100 pipeline steel deformation amount cooling rate final cooling temperature microstructure

Received: 17 May 2013

Fund: *Supported by National "Twelfth Five-Year" Plan for Science & Technology Support No.2011BAE35B01.

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	Linna DUAN
	Yu CHEN
	Qingyou LIU
	Shujun JIA
	Chengchang JIA

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https://www.cjmr.org/EN/10.11901/1005.3093.2013.329 OR https://www.cjmr.org/EN/Y2014/V28/I1/51

Fig.1 Schematic illustration of thermal simulation test (1) e=20, 30, 40, 50%, CR=25℃/s, T=360℃; (2) e=40%, CR=10, 20, 25, 30, 40, 50℃/s, T=360℃; (3) e=40%, CR=25℃/s, T=420, 400, 380, 360, 340, 320, 300℃

Fig.2 Microstructure of continuously cooled specimens (a) 0.03℃/s; (b) 0.06℃/s; (c) 0.14℃/s; (d) 0.28℃/s; (e) 0.8℃/s; (f) 1.6℃/s; (g) 4℃/s; (h) 8℃/s; (i) 16℃/s

Fig.3 Static CCT curve of the tested steel

Fig.4 Effect of finish rolling deformation amount on microstructure of tested steel, (a) 20%; (b) 30%; (c) 40%; (d) 50%

Fig.5 SEM micrograph of microstructure of tested steel at different cooling rate (a) 10℃/s; (b) 20℃/s; (c) 25℃/s; (d) 30℃/s; (e) 40℃/s; (f) 50℃/s

Fig.6 Effect of cooling rate on micro-hardness of tested steel

Fig.7 SEM micrograph of microstructure of tested steel at different final cooling temperature (a) 420℃; (b) 400℃; (c) 380℃; (d) 360℃; (e) 340℃; (f) 300℃

Fig.8 Effect of final cooling temperature on micro-hardness of tested steels

Table 1 Chemical properties of the tested steel

Fig.9 EBSD maps of tested steel at different cooling rate (a) 25℃/s; (b) 40℃/s

Fig.10 Misorientation angle maps of the tested steel (a) 25℃/s; (b) 40℃/s

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