Effect of coiling temperature on the microstructure and mechanical properties of a Ti-Nb microalloyed steel

Guan Jianhui; Qu Jinbo; Ding Meiliang

doi:10.7513/j.issn.1004-7638.2023.02.023

Volume 44 Issue 2

Apr. 2023

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Guan Jianhui, Qu Jinbo, Ding Meiliang. Effect of coiling temperature on the microstructure and mechanical properties of a Ti-Nb microalloyed steel[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(2): 160-166. doi: 10.7513/j.issn.1004-7638.2023.02.023

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Guan Jianhui, Qu Jinbo, Ding Meiliang. Effect of coiling temperature on the microstructure and mechanical properties of a Ti-Nb microalloyed steel[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(2): 160-166. doi: 10.7513/j.issn.1004-7638.2023.02.023

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Effect of coiling temperature on the microstructure and mechanical properties of a Ti-Nb microalloyed steel

doi: 10.7513/j.issn.1004-7638.2023.02.023

Institute of Research of Iron and Steel, Shasteel, Zhangjiagang 215625, Jiangsu, China

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Received Date: 2022-06-15
Publish Date: 2023-04-30

Abstract

Abstract

The effect of coiling temperature on the microstructure and mechanical property of a Ti-Nb microalloyed steel was studied by simulated hot rolling and coiling tests conducted on a pilot hot rolling mill and heat treatment furnace. The results show that the phase transformation process of steel gradually changes from diffusion-type phase transformation to shear-type phase transformation, and the microstructure changes from equiaxed ferritic grain to polygonal ferrite, granular bainite, and lath bainite with the coiling temperature decreases. In addition, the strength first decreases and then increases, while the elongation decreases due to precipitation strengthening and phase transformation strengthening. The strength of the steel at the coiling state is higher than that of the steel after air-cooled due to the precipitation and strengthening of micro-alloy carbonitride during the coiling. With the decrease in coiling temperature, the strength increment of steel at the coiling state gradually decreases compared with the steel after air-cooled. The yield strength is 744～754 MPa, and the elongation is 19%～20.9%, which can obtain good comprehensive properties when the coiling temperature of Ti-Nb microalloyed steel is set at 560～630 ℃.
- Ti-Nb microalloyed steel,
- coiling temperature,
- mechanical property,
- microstructure

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References(10)

References

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