Effect of Warm-rolled Temperature on Microstructure and Texture in Cr-Ti-B Low Carbon Steel

doi:10.11901/1005.3093.2020.493

Chinese Journal of Materials Research

2022, Vol. 36

Issue (2): 81-89 DOI: 10.11901/1005.3093.2020.493

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Effect of Warm-rolled Temperature on Microstructure and Texture in Cr-Ti-B Low Carbon Steel

YUAN Qiangqiang, WANG Zhigang(

), JIANG Yongfang, ZHANG Yinghui(

), HUANG Ankang, YE Jieyun

Department of Materials Metallurgy Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China

Cite this article:

YUAN Qiangqiang, WANG Zhigang, JIANG Yongfang, ZHANG Yinghui, HUANG Ankang, YE Jieyun. Effect of Warm-rolled Temperature on Microstructure and Texture in Cr-Ti-B Low Carbon Steel. Chinese Journal of Materials Research, 2022, 36(2): 81-89.

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Abstract

The effect of warm rolling temperature on deformation microstructure and texture of C-Cr-Ti-B low carbon steel were analyzed by means of scanning electron microscopy, electron backscatter diffraction, transmission electron microscopy and internal friction measurement. The results show that the microstructure after warm rolling was composed of deformed ferrite and a few of pearlite, while the ferrite content in-grain shear band increased first and then decreased with the increase of warm rolling temperature, which reaches the maximum when warm rolling at 450℃. The information of shear bands is closely related to the segregation of Ti and B elements. {001}<110> and {223}<110> textures are the main components at 350℃ and 550℃ respectively, and the shear band formed during rolling at 450℃ favors the formation of the γ-fiber texture obviously. The rolling temperature had little effect on the intensity of the {001}<110> but more effect on the γ-fiber, and the {111}<112> component was the stable texture. The results of dislocation density and internal friction test indirectly indicate that the strong interaction between solid solution C atom and dislocation is the reason to inhibit the formation of shear band at low temperature, whereas, the dynamic recovery leads to weak γ-fiber texture at high temperature.

Key words: metallic materials micro-alloyed low carbon steel warm rolling deformation texture in-grain shear bands solute carbon atoms

Received: 19 November 2020

ZTFLH:

TG142.1

Fund: National Natural Science Foundation of China(5170040846);the Key Research and Development Program of Jiangxi Province(909171403002)

About author: ZHANG Yinghui, Tel: 13979764105, E-mail: jxustzyh@163.com
WANG Zhigang, Tel: (0797)8312422, E-mail: wzgang2008cn@163.com

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	Qiangqiang YUAN
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	Jieyun YE

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.493 OR https://www.cjmr.org/EN/Y2022/V36/I2/81

Table 1 Chemical composition of Cr-Ti-B low carbon steel (mass fraction, %)

Fig.1 Microstructure of Cr-Ti-B LC steel rolled at 250℃ (a), 350℃ (b), 450℃ (c), 550℃ (d), 650℃ (e) and relationship between content of shear band and rolling temperature (f)

Fig.2 SEM microstructure of Cr-Ti-B LC steel rolled at 450℃ (a) shear bands; (b) pearlite phase

Fig.3 Constant φ₂=45° ODF sections obtained at the center of sample after rolling temperature at 350℃ (a), 450℃ (b) and 550℃ (c)

Fig.4 Variation in the orientation density along the α and γ orientation lines of steel plates after warm rolling different temperature (a) α orientation line; (b) γ orientation line

Fig.5 State of dislocation rolled at 350℃ and 550℃ (a) pile-up; (b) dislocation cell

Fig.6 Element content and distribution in deformation band (a) and shear band (b)

Fig.7 Grain orientation distribution and geometrically necessary dislocation density change after warm rolling at different rolling temperature (a, d) 350℃; (b, e) 450℃; (c, f) 550℃

Fig.8 Relationship between hardness and rolling temperature of warm rolled plate

Fig.9 Internal friction curves of hot rolling plate (a) and warm rolling plate after rolling at 250℃ (b), 350℃(c), 450℃ (d), 550℃ (e) and 650℃ (f)

Fig.10 Relationship between M₇C₃ and M₂₃C₆ precipitate and warm rolling temperature

Table 2 Internal friction of low carbon steel after rolling at different temperature

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