終軋溫度對600 MPa級高鈦高成型性鐵素體-珠光體酸洗帶鋼組織與織構的影響

王智權; 郭子峰; 尚成嘉; 張衍; 馮軍; 陳斌; 呂寶鋒; 李玉鵬

doi:10.13374/j.issn2095-9389.2019.01.011

終軋溫度對600 MPa級高鈦高成型性鐵素體-珠光體酸洗帶鋼組織與織構的影響

doi: 10.13374/j.issn2095-9389.2019.01.011

王智權^{1, 2, 3},
郭子峰^{2, 3},
尚成嘉^1, ,,
張衍^{2, 3},
馮軍^{2, 3},
陳斌^{2, 3},
呂寶鋒⁴,
李玉鵬⁴

1.
北京科技大學鋼鐵共性技術協同創新中心, 北京 100083
2.
首鋼集團有限公司技術研究院薄板研究所, 北京 100043
3.
首鋼集團有限公司綠色可循環鋼鐵流程北京市重點實驗室, 北京 100043
4.
首鋼股份公司遷安鋼鐵公司, 遷安 064404

詳細信息

通訊作者:
尚成嘉, E-mail: cjshang@ustb.edu.cn

中圖分類號: TG142.71
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出版歷程
- 收稿日期: 2017-12-21
- 刊出日期: 2019-01-01

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

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

摘要

摘要: 利用掃描電子顯微鏡(SEM)與電子背散射衍射技術(EBSD)研究了高Ti高成型性鐵素體-珠光體型熱軋酸洗帶鋼不同終軋溫度下的組織與織構特征.研究結果表明, 終軋溫度對顯微組織的演變影響較小, 但卻引起了大角晶界密度的升高.不同終軋溫度時形成的組織均以鐵素體為主, 少量的珠光體彌散分布在鐵素體基體之間.終軋溫度的提高引起了織構類型的顯著改變, 隨著終軋溫度的升高, 織構強度整體增強, 并形成了明顯的對沖壓成型性有利的近γ織構.當終軋溫度為850℃時, 近α織構與γ織構強度均較弱, 此時的織構類型主要為{001}[110]、{113}[471]、{114}[110]和{223}[110]成型不利織構, 成型不利織構強度更高; 當終軋溫度升高至875℃時, 織構類型主要為近γ織構和{001}[110]旋轉立方織構, 近γ織構體積分數由19.9%升高至41%, 成型有利織構強度顯著增強.
- 熱軋酸洗帶鋼 /
- 終軋溫度 /
- 顯微組織 /
- 織構 /
- 大角晶界 /
- 成型性
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

HTML全文

圖 1 不同終軋溫度時的掃描組織. (a) 850 ℃；(b) 875 ℃

Figure 1. SEM images of sample microstructures for differential FDTs: (a) 850 ℃; (b) 875 ℃

下載: 全尺寸圖片幻燈片

圖 2 不同終軋溫度時的晶粒大小分布情況. (a) 850 ℃；(b) 875 ℃

Figure 2. Schematic illustration of grain sizes at different FDTs: (a) 850 ℃; (b) 875 ℃

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圖 3 不同終軋溫度時IPF圖. (a) 850 ℃; (b) 875 ℃; (c) 圖例

Figure 3. IPF images at different FDTs: (a) 850 ℃; (b) 875 ℃; (c) IPF legend

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圖 4 不同終軋溫度時的取向密度分布圖. (a) 850 ℃; (b) 875 ℃

Figure 4. ODF images with different FDTs: (a) 850 ℃; (b) 875 ℃

下載: 全尺寸圖片幻燈片

圖 5 φ₂=45°時取向密度分布圖. (a) 850 ℃; (b) 875 ℃

Figure 5. ODF images at φ₂=45° with different FDTs: (a) 850 ℃; (b) 875 ℃

下載: 全尺寸圖片幻燈片

圖 6 φ₂=45°時取向密度圖.(a) γ織構；(b) α織構

Figure 6. Intensities of α, γ texture at φ₂=45°: (a) γ texture; (b) α texture

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圖 7 不同終軋溫度時大于45°角晶界分布情況. (a) 850 ℃; (b) 875 ℃

Figure 7. High-angle grain-boundary over 45° distribution at different FDTs: (a) 850 ℃; (b) 875 ℃

下載: 全尺寸圖片幻燈片

圖 8 不同終軋溫度對晶界密度的影響

Figure 8. Angle distributions at different FDT

下載: 全尺寸圖片幻燈片

表 1 實驗鋼板的化學成分(質量分數)

Table 1. Chemical composition of experimental steels?%

C	Si	Mn	S	Nb	Ti
0.02~0.05	≤0.50	1.00~1.60	≤0.010	0.01~0.07	0.02~0.07

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表 2 不同終軋溫度對織構體積分數的影響情況

Table 2. Fractions of typical textures at different FDTs

樣號	FDT/℃	近α織構體積分數/%	近γ織構體積分數/%
a	850	30.9	13.7
b	875	19.9	41.0

下載: 導出CSV

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