Study on Strengthening Mechanism and Application Performance of the High Toughness 2 GPa Hot Forming Steel

DOI

10.2991/978-94-6463-114-2_2How to use a DOI?

Keywords

2 GPa; Hot forming steel; High toughness; Strengthening mechanism; Application performance

Abstract

The high toughness 2 GPa hot forming steel of Tangsteel achieved the strength of 2 GPa after hot stamping through the composite strengthening mechanism of composition design, martensitic strengthening, fine grain strengthening and precipitation strengthening. The carbon content in martensite was reduced by the precipitation of nano-VC, and the formation of brittle twin martensite was physically inhibited. The strength was improved while the toughness and ductility were obtained, and the comprehensive mechanical properties were excellent. Moreover, the irreversible hydrogen trap with high binding energy of V element in the steel improves the anti-hydrogen brittleness of the material and greatly reduces the risk of delayed cracking in the service environment after hot forming. The hot stamping process of 2 GPa hot forming steel with high toughness was studied, and the recommended process is heating temperature 910–930 ℃, heating time 240–300 s, holding time 7–15 s. The key application properties of 2 GPa hot formed steel with high toughness, such as spot-welding performance, bending performance, high speed tensile performance, anti-delayed fracture performance and coating anti-corrosion performance were studied. All of them met or were better than the requirements of relevant standards, indicating that the 2 GPa hot formed steel with high toughness of Tangsteel has good application performance.

Copyright

© 2023 The Author(s)

Open Access

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TY  - CONF
AU  - B. Chen
AU  - Z. W. Liang
AU  - S. C. Yin
AU  - L. P. Liu
AU  - J. G. Zhang
AU  - C. Y. Zhai
AU  - T. Liu
PY  - 2023
DA  - 2023/03/02
TI  - Study on Strengthening Mechanism and Application Performance of the High Toughness 2 GPa Hot Forming Steel
BT  - Proceedings of the 6th International Conference on Advanced High Strength Steel and Press Hardening (ICHSU 2022)
PB  - Atlantis Press
SP  - 5
EP  - 18
SN  - 2590-3217
UR  - https://doi.org/10.2991/978-94-6463-114-2_2
DO  - 10.2991/978-94-6463-114-2_2
ID  - Chen2023
ER  -