Effect of FDT on microstructure and crystallographic texture of 600 MPa grade high-titanium high-formability ferrite-pearlite pickling steel

WANG Zhi-quan; GUO Zi-feng; SHANG Cheng-jia; ZHANG Yan; FENG Jun; CHEN Bin; Lü Bao-feng; LI Yu-peng

doi:10.13374/j.issn2095-9389.2019.01.011

Volume 41 Issue 1

Jan. 2019

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Article Navigation > Chinese Journal of Engineering > 2019 > 41(1): 104-110

WANG Zhi-quan, GUO Zi-feng, SHANG Cheng-jia, ZHANG Yan, FENG Jun, CHEN Bin, Lü Bao-feng, LI Yu-peng. Effect of FDT on microstructure and crystallographic texture of 600 MPa grade high-titanium high-formability ferrite-pearlite pickling steel[J]. Chinese Journal of Engineering, 2019, 41(1): 104-110. doi: 10.13374/j.issn2095-9389.2019.01.011

Citation:

WANG Zhi-quan, GUO Zi-feng, SHANG Cheng-jia, ZHANG Yan, FENG Jun, CHEN Bin, Lü Bao-feng, LI Yu-peng. Effect of FDT on microstructure and crystallographic texture of 600 MPa grade high-titanium high-formability ferrite-pearlite pickling steel[J]. Chinese Journal of Engineering, 2019, 41(1): 104-110. doi: 10.13374/j.issn2095-9389.2019.01.011

Citation:

WANG Zhi-quan, GUO Zi-feng, SHANG Cheng-jia, ZHANG Yan, FENG Jun, CHEN Bin, Lü Bao-feng, LI Yu-peng. Effect of FDT on microstructure and crystallographic texture of 600 MPa grade high-titanium high-formability ferrite-pearlite pickling steel[J]. Chinese Journal of Engineering, 2019, 41(1): 104-110. doi: 10.13374/j.issn2095-9389.2019.01.011

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Effect of FDT on microstructure and crystallographic texture of 600 MPa grade high-titanium high-formability ferrite-pearlite pickling steel

doi: 10.13374/j.issn2095-9389.2019.01.011

WANG Zhi-quan^{1, 2, 3},
GUO Zi-feng^{2, 3},
SHANG Cheng-jia^{1
,
,},
ZHANG Yan^{2, 3},
FENG Jun^{2, 3},
CHEN Bin^{2, 3},
Lü Bao-feng⁴,
LI Yu-peng⁴

1.
Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
2.
Sheet Metal Research Institute, Shougang Research Institute of Technology, Shougang Group Co., Ltd., Beijing 100043, China
3.
Beijing key Laboratory of Green Recyclable Process for Iron & steel Production Technology, Shougang Group Co., Ltd, Beijing 100043, China
4.
Shougang Qian'an Iron & Steel Co. Ltd, Qian'an 064404, China

More Information

Corresponding author: SHANG Cheng-jia E-mail: cjshang@ustb.edu.cn
Received Date: 2017-12-21
Publish Date: 2019-01-01

Abstract

Abstract

Obtaining a near-γ texture that parallels that of a rolling plane enhances the r value of steel, thereby improving its formability. A high-angle grain boundary with a misorientation greater than 45 degrees is another crucial factor contributing to the formability of steel. Steel's crack arrest capability is dramatically improved by increasing the density of the high-angle grain boundary. The primary factors associated with texture evolution include chemical composition, finishing delivery temperature (FDT), rolling speed, and cooling rate after final rolling, of which the FDT is the most critical. Previous studies, which emphasized only pipelines and interstitial-free steels, have suggested that there is a discrepancy in the relationship between FDT and texture, and this relationship remains unclear with respect to high-titanium high-formability ferrite-pearlite steel. In this study, the microstructure and crystallographic texture of a 600 MPa grade high-titanium high-formability ferrite-pearlite steel with differential FDT were investigated by scanning electron microscopy and electron backscatter diffraction techniques. The results reveal that its microstructure comprises ferrite and pearlite irrespective of FDT, but increases in the FTD cause an increase in the high-angle grain-boundary density. The primary microstructure is ferrite in both these samples, with a small amount of pearlite dispersed between the ferrite grains. The texture dramatically changes with elevated FDT. The intensity of all the textures significantly increases as the FDT increases from 850℃ to 875℃, with the transformation of a large amount of apparent near-γ textures, which is beneficial to formability. The intensities of near-α texture and γ texture are low in the sample with an FDT of 850℃, wherein the primary textures include {001}[110], {113}[471], {114}[110], and {223}[110]. The intensity of the textures disadvantageous for formability is stronger than that of the advantageous textures in the sample with a lower FDT, which constrains formability and should be avoided. A positive change was observed in the textures as the FDT increased to 875℃. A strong near-γ texture was transformed in the steel that was finally rolled at 875℃, and its fraction increased to 41% from 19.9% at 850℃. A strong {001}[110] rotated cubic texture also occurred in the 875℃ finally rolled steel, which is bad for formability. However, superior formability can be guaranteed in general as the transformation of more advantageous textures than disadvantageous textures was observed.
- hot rolled pickling steel,
- finishing delivery temperature,
- microstructure,
- texture,
- high angle grain boundary,
- formability

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References(14)

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