High-strength and high-plasticity TWIP steel and preparation method thereof

US11718890B2 · kind B2 · utility

Assignees

• Jiangxi University of Science and Technology · CN
• Guorui Scientific Innovation Rare Earth Functional · CN

Inventors

• Zhigang Wang · Lexington, US
• Lingqiang Zhong · Ganzhou, CN
• Jieyun YE · Ganzhou, CN
• Hebin WANG · Ganzhou, CN
• Weizhen Liu · Tangxia, CN
• Weihao CAI · Ganzhou, CN
• Xuwei LIU · Ganzhou, CN

Key dates

• Filing date: Jan 25, 2022
• Grant date: Aug 8, 2023
• Expiry date: Jan 25, 2042

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A high-strength and high-plasticity TWIP steel and a preparation method thereof are disclosed. In the disclosure, comprehensive properties of TWIP steel are improved by inclusion modification with Ce and Ba addition, fine grain strengthening and twinning nanocrystallization; the grain size is controlled by a low-temperature cold rolling, a transient annealing treatment and a low-temperature tempering treatment. Considering the addition of Ce, stacking fault energy of the TWIP steel is reduced, and the formation of twins, and the division of twins into grains are promoted, which further reduces a mean free path of dislocation motion, thereby improving yield strength, and finally obtaining a high-strength and high-plasticity TWIP steel.