A martensitic precipitation hardened steel and a method of making the same
By introducing an ultrafine-grained multiphase structure into martensitic aging steel and employing a specific heat treatment process, the problem of insufficient strength and toughness of large-size steel components under extreme environments has been solved, achieving a balance between high strength and high toughness and improving the service performance of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- INST OF METAL RESEARCH - CHINESE ACAD OF SCI
- Filing Date
- 2026-03-10
- Publication Date
- 2026-06-05
AI Technical Summary
Existing technologies struggle to achieve both ultra-high strength and high toughness in large-sized steel components, resulting in insufficient performance under extreme stress environments and failing to meet the manufacturing requirements of high-end equipment.
By preparing a martensitic aging steel with an ultrafine-grained multiphase structure, including an interwoven distribution of ultrafine-grained martensite and ultrafine-grained austenite phases, and through solution heat treatment, cryogenic treatment, repeated solution treatment and aging treatment, a multi-level multiphase structure with a specific ratio is formed, thereby improving the strength and toughness of the steel.
It achieves a high strength and high toughness match for large-section steel, with yield strength ≥2.1GPa, tensile strength ≥2.2GPa, elongation after fracture ≥7%, reduction of area ≥50%, and V-notch impact energy ≥15J-25J, significantly improving the impact toughness of large-section steel.
Smart Images
Figure CN121802304B_ABST