Effects of Pre-Deformation Temperature on Nanobainite Transformation Kinetics and Microstructure

doi:10.11900/0412.1961.2017.00506

Acta Metall Sin

2018, Vol. 54

Issue (8): 1113-1121 DOI: 10.11900/0412.1961.2017.00506

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Effects of Pre-Deformation Temperature on Nanobainite Transformation Kinetics and Microstructure

Shixin XU^1,^2,³(

), Wei YU², Shujia LI¹, Kun WANG¹, Qisong SUN¹

1 Research Institute of Technology, Shougang Group Co., Ltd., Beijing 100043, China
2 Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, China
3 Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production, Shougang Group Co., Ltd., Beijing 100043, China

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Shixin XU, Wei YU, Shujia LI, Kun WANG, Qisong SUN. Effects of Pre-Deformation Temperature on Nanobainite Transformation Kinetics and Microstructure. Acta Metall Sin, 2018, 54(8): 1113-1121.

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Abstract

As a new steel, nanobainite steel has favourable strength and good plasticity, but the bainite transformation needs a longer time, so as to severely slow production efficiency down. So, the research of acceleration methods of bainite transformation is of significance. In this work, in order to accelerate the bainite transformation rate, the 20% compression pre-deformation at 300~850 ℃ and isothermal transformation at 300 ℃ were conducted on a thermal simulator. The effects of pre-deformation temperature on nanobainite transformation kinetics and microstructure of the medium carbon nanobainite steel were investigated. The results showed that pre-deformation process obviously shortened the incubation time of bainite transformation. Low pre-deformation temperature could accelerate bainite transformation at whole isothermal region, while high pre-deformation temperature accelerated bainite transformation at the initial stage, and hindered bainite transformation at later stage. Bainite ferrite lath thickness was increased with decreasing pre-deformation temperature. The pre-deformation process increased the frequency of small angle grain boundary of bainite transformation microstructure, and the frequency of small angle grain boundary of low pre-deformation temperature was higher than that of high pre-deformation temperature. The kinetic parameters n of bainite transformation was calculated by the analytical model, the model of nucleation and growth were identified, the pre-deformation process changed the nucleation position of bainite transformation. The crystal corner nucleation was mainly obtained through low pre-deformation temperature, and the crystal edge and the crystal face nucleation were mainly obtained through high pre-deformation temperature.

Key words: pre-deformation temperature nanobainite transformation kinetics microstructure analytical model

Received: 30 November 2017

ZTFLH:

TG142.1

Fund: Supported by Key Projects in the National Science & Technology Pillar Program during the 12th Five-Year Plan Period (No.2012BAE03B01)

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	Shixin XU
	Wei YU
	Shujia LI
	Kun WANG
	Qisong SUN

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https://www.ams.org.cn/EN/10.11900/0412.1961.2017.00506 OR https://www.ams.org.cn/EN/Y2018/V54/I8/1113

Fig.1 Schematic of the pre-deformation and isothermal treatment

Fig.2 Curves of the kinetics of bainite transformation under different processes (f_BF—volume fraction of bainite ferrite, t—time)

Fig.3 Increasing rate curves of volume fraction of bainite ferrite under different processes

Fig.4 SEM images of sample under different processes with volume fraction of bainite ferrite 5% (AGB—austenite grain boundary, GE—grain edge, SB—shear band) (a) nondeformed (b) 850 ℃ (c) 300 ℃

Fig.5 SEM images of pre-deformed sample at 300 ℃ for different isothermal time(a) 0 s (b) 100 s (c) 180 s (d) 450 s

Fig.6 SEM images of sample under different pre-deformation processes and isothermal treatment(a) 300 ℃ (b) 500 ℃ (c) 700 ℃ (d) 850 ℃ (e) nondeformed

Fig.7 EBSD images of pre-deformation and isothermal treatment sample at 300 ℃ (M—martensite)(a) secondary electron image (b) austenite phase distribution

Fig.8 TEM images of sample under different pre-deformation processes(a) 300 ℃ (b) 850 ℃ (c) nondeformed

Fig.9 Density distributions of grain misorientation of sample under different pre-deformation processes (Insets show the high magnified images)

Fig.10 Change of transformation kinetic parameter (n) with t (a) and f_BF (b)

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