A quenching heat treatment method for enhancing contact fatigue of a die steel
By employing multi-stage heat treatment and chemical composition optimization, the problem of insufficient wear resistance and thermal fatigue resistance of mold steel under high-temperature environments has been solved, and the uniformity and stability of the material have been improved, making it suitable for the development of high-strength and high-toughness hot work mold steel.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NINGBO BEILUN CHAOLI DIE STEEL CO LTD
- Filing Date
- 2025-04-28
- Publication Date
- 2026-06-09
AI Technical Summary
Existing heat treatment methods are insufficient to significantly enhance the wear resistance and thermal fatigue resistance of mold steel while maintaining its toughness. They are particularly poor under high-temperature repeated load conditions, and the control of chemical composition and process parameters is not precise enough, affecting the uniformity and stability of the material.
A multi-stage heat treatment method is adopted, including heating, cooling and nitrogen holding in a vacuum environment. Combined with precisely controlled temperature and time parameters, the chemical composition ratio of the mold steel is optimized through cyclic heat treatment and single tempering to form a fine and uniform martensitic structure and reduce the formation of harmful phases.
It significantly improves the hardenability and wear resistance of mold steel, extends its service life, and is particularly suitable for die casting applications in high-temperature environments. It also enhances the uniformity and stability of the material while maintaining good toughness.
Smart Images
Figure CN120519660B_ABST