Effect of Ca-Mg compound modifier on microstructure and plasicity in cold-rolled high strength steel

Li Yuanyuan; Zhen Weijing; Li Yongliang; Yan Zhijie

doi:10.7513/j.issn.1004-7638.2021.01.019

Volume 42 Issue 1

Feb. 2021

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Article Navigation > IRON STEEL VANADIUM TITANIUM > 2021 > 42(1): 119-125

Li Yuanyuan, Zhen Weijing, Li Yongliang, Yan Zhijie. Effect of Ca-Mg compound modifier on microstructure and plasicity in cold-rolled high strength steel[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(1): 119-125. doi: 10.7513/j.issn.1004-7638.2021.01.019

Citation:

Li Yuanyuan, Zhen Weijing, Li Yongliang, Yan Zhijie. Effect of Ca-Mg compound modifier on microstructure and plasicity in cold-rolled high strength steel[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(1): 119-125. doi: 10.7513/j.issn.1004-7638.2021.01.019

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Effect of Ca-Mg compound modifier on microstructure and plasicity in cold-rolled high strength steel

doi: 10.7513/j.issn.1004-7638.2021.01.019

1.
Tangshan Vocational College of Science and Technology, Tangshan 063001, Hebei, China
2.
Thchnology Center of Tangshan Steel, Hebei Steel Group, Tangshan 063016, Hebei, China
3.
School of Material Science and Engineering, North University of China, Taiyuan 030051, Shanxi, China

Received Date: 2020-04-08
Publish Date: 2021-02-10

Abstract

Abstract

The influence mechanism of Ca-Mg compound modifier on TiN precipitation in ingot of producing ultra-high cold-rolled strength steel were studied by means of optical microscope (OM), transmission electron microscope (TEM) and electron backscatter diffraction (EBSD), etc. Andmicrostructure hereditary effect and plastic improvement at various process steps were compared systematically. The result showed that the size of TiN reduced with the addition of modifier, whereas its density increased with a relatively uniform distribution. Addition of modifier decreased the volume fraction of ferrite along grain boundary for both ingot and hot rolled strip, and resulted in fine microstructure in the as-cold rolled sheet. Comparing modifier-free sample, the yield strength, yield ratio dramatically increased and the bending properties and hole expanding ratio improved for the modifier-bearing sheet. The nucleation mechanism of TiN was changed by the addition of Ca-Mg compound modifier. The dispersed TiN particles could effectively refine the casting microstructure, and the microstructure for hot-rolled or cold-rolled were all refined effectively by hereditary effect which could significantly improve the mechanical properties and formability of steel.
- high strength steel,
- TiN,
- modifier,
- microstructure,
- mechanical property,
- formability

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References(23)

References

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