Study on the influence of Si addition on the mechanical properties of high Mn-N type TWIP stainless steels

Zeng Zeyao; Luo Xu

doi:10.7513/j.issn.1004-7638.2024.04.024

Volume 45 Issue 4

Aug. 2024

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Zeng Zeyao, Luo Xu. Study on the influence of Si addition on the mechanical properties of high Mn-N type TWIP stainless steels[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(4): 170-175. doi: 10.7513/j.issn.1004-7638.2024.04.024

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Zeng Zeyao, Luo Xu. Study on the influence of Si addition on the mechanical properties of high Mn-N type TWIP stainless steels[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(4): 170-175. doi: 10.7513/j.issn.1004-7638.2024.04.024

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Study on the influence of Si addition on the mechanical properties of high Mn-N type TWIP stainless steels

doi: 10.7513/j.issn.1004-7638.2024.04.024

Zeng Zeyao,
Luo Xu

State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, Sichuan, China

Received Date: 2023-08-05
Publish Date: 2024-08-30

Abstract

Abstract

The effects of different heat treatment processes on the microstructure and mechanical properties of high Mn-N TWIP stainless steels with 1.5% Si addition were studied by SEM and TEM. The results showed that the annealing twin thickness of the tested steel increased with the increase in solution temperature. At high solution temperatures, Si was added to improve the strain hardening rate of the alloy. A large number of slender deformation twins were generated during tensile deformation, which can effectively prevent dislocation slip and improve materials strength and plasticity. The effect of aging treatment on the materials tensile properties was relatively small. During the aging process at 700~800 ℃, a large amount of grain boundary cellular precipitates were generated, which were mainly composed of short rod-shaped Cr₂N particles. Under impacting loads, intergranular brittle fracture occurred, and the impact absorption energy decreased rapidly.
- TWIP stainless steel,
- Si,
- precipitated phase,
- intergranular fracture,
- impact toughness

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References

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