Study on the differences in microstructure, mechanical properties, and deformation mechanism between DH and DP steels

Zhou Li; Xue Renjie; Cao Xiaoen; Wen Caijun

doi:10.7513/j.issn.1004-7638.2023.06.026

Volume 44 Issue 6

Dec. 2023

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Zhou Li, Xue Renjie, Cao Xiaoen, Wen Caijun. Study on the differences in microstructure, mechanical properties, and deformation mechanism between DH and DP steels[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(6): 186-191. doi: 10.7513/j.issn.1004-7638.2023.06.026

Citation:

Zhou Li, Xue Renjie, Cao Xiaoen, Wen Caijun. Study on the differences in microstructure, mechanical properties, and deformation mechanism between DH and DP steels[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(6): 186-191. doi: 10.7513/j.issn.1004-7638.2023.06.026

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Study on the differences in microstructure, mechanical properties, and deformation mechanism between DH and DP steels

doi: 10.7513/j.issn.1004-7638.2023.06.026

Zhou Li^1
,,
Xue Renjie^{2
,
,},
Cao Xiaoen³,
Wen Caijun⁴

1.
School of Mechanical Engineering and Automation, Chongqing Industry Polytechnic College, Chongqing 401120, China
2.
Materials Technology Research Institute, HBIS Group, Shijiazhuang 050000, Hebei, China
3.
Technology Center, Hansteel Company, HBIS Group, Handan 056015, Hebei, China
4.
Material Science and Engineering School, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China

Received Date: 2022-11-28
Available Online: 2024-01-11
Publish Date: 2023-12-30

Abstract

Abstract

High speed tensile test, comprehensive forming test, field emission scanning electron microscope (SEM), X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and other characterization methods were used to study the differences of microstructure and properties between DH780 and DP780 cold-rolled dual phase steels. The research shows that the main differences between the microstructures of DH780 and DP780 steels depend on the occurrence of retained austenite. The former has about 5.1% retained austenite, which is located at the phase interfaces and ferrite grain boundary in the blocks, thin films, chains and fine particles appearances. It has a significant TRIP effect during deformation. At the same time, the retained austenite has more slip systems, which can effectively retard the dislocation accumulation, stress concentration and crack initiation. DH780 has better strength-ductility balance (TS × EL) and hole expanding performance than DP780. High speed tensile test shows that DH780 has higher strain rate sensitivity than DP780; With the increase of strain rate, the strength-ductility balance (TS × EL) of DH780 increases to 38.83 GPa·%, and the energy absorption performance is significantly enhanced.
- dual phase steel,
- retained austenite,
- TRIP effect,
- strain rate,
- strength-ductility balance( TS × EL),
- hole expanding performance

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References(12)

References

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