Ferrite grain size control of dual phase steel and its effect on mechanical properties and hydrogen diffusion properties

Ye Qing

doi:10.7513/j.issn.1004-7638.2022.05.024

Volume 43 Issue 5

Nov. 2022

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Ye Qing. Ferrite grain size control of dual phase steel and its effect on mechanical properties and hydrogen diffusion properties[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(5): 166-170. doi: 10.7513/j.issn.1004-7638.2022.05.024

Citation:

Ye Qing. Ferrite grain size control of dual phase steel and its effect on mechanical properties and hydrogen diffusion properties[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(5): 166-170. doi: 10.7513/j.issn.1004-7638.2022.05.024

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Ferrite grain size control of dual phase steel and its effect on mechanical properties and hydrogen diffusion properties

doi: 10.7513/j.issn.1004-7638.2022.05.024

Ye Qing^{1, 2
,}

1.
School of Mechanical and Electrical Engineering, Liuzhou Vocational and Technical College, Liuzhou 545616, Guangxi, China
2.
Technical Center of Liuzhou Iron and Steel Group Co., Ltd., Liuzhou 545616, Guangxi, China

Received Date: 2021-07-26
Publish Date: 2022-11-01

Abstract

Abstract

Three different ferrite grain-sized ferrite-martensite dual-phase steels were prepared by large-strain warm deformation at different deformation temperatures in a thermal simulation process, followed by intercritical annealing at 920 ℃ for 3 min in this study. The dimensions were 11.6, 2.3 μm, and 1.1 μm, respectively, with the same content of martensite (about 30%.). The microstructure and mechanical properties of three ferrite-martensite dual-phase steels with different ferrite grain sizes were characterized by SEM, TEM and tensile test. The results show that the yield strength and tensile strength of ferrite-martensite materials increase significantly with the decrease of ferrite grain size from 11.6 to 2.3 and 1.1 μm at the same martensite content level (about 30%), the tensile strength increases from 865 MPa to 965 MPa and 1030 MPa, but the yield strength ratio and elongation of the three materials change little. With the refinement of ferrite grains, martensite bands are segregated by ferrite, which effectively enhances the plasticity of martensite and slows down the diffusion of hydrogen in test steel, The hydrogen diffusion coefficient decreased from 3.91×10⁻¹² m²/s to 2.71×10⁻¹² m²/s and 9.80×10⁻¹³ m²/s.
- dual-phase steel,
- ferrite grain size,
- mechanical properties,
- hydrogen diffusion

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References(13)

References

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