稀土微合金化超高强度高韧性热作模具钢及其制备方法
By using rare earth microalloying and catalytic water-gas reaction, the problems of residual oxide film and agglomeration of reinforcing phase in powder metallurgy hot work die steel have been solved, realizing the preparation of die steel with high strength, high toughness and high temperature thermal stability, which is suitable for industrial fields such as aluminum alloy die casting molds, hot extrusion molds and hot forging molds.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-25
- Publication Date
- 2026-07-17
AI Technical Summary
Existing powder metallurgy hot work die steels suffer from reduced material density and toughness due to residual oxide film on the powder surface forming original particle boundaries. Additionally, conventional external strengthening phases tend to agglomerate in the matrix and have low interfacial bonding strength, resulting in limited high-temperature mechanical properties.
A rare earth microalloying method is adopted, in-situ reduction is achieved by releasing active hydrogen through the decomposition of rare earth hydrides during the heating process. This is combined with porous amorphous carbon powder with a nickel catalyst to catalyze the water-gas reaction to remove the oxide film, and high-hardness boride is generated by using boron carbide powder to achieve in-situ deep deoxidation and dispersion strengthening.
Atomic-level metallurgical bonding between powder particles was achieved, eliminating oxide films and original particle boundaries, resulting in a uniform distribution of low-oxygen-content, defect-free nano-reinforcing phases. This significantly improved the material's impact toughness and high-temperature thermal stability, meeting the requirements for service environments above 600℃.
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Abstract
Citation Information
Patent Citations
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