Maraging Steel Composition Balancing Strength and Plasticity
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Solution Overview
Problem
Maraging steel's high strength is achieved at the cost of significant plasticity reduction due to TiN inclusions, limiting its application scope and safety reliability.
Innovation Solution
Control the content of Ti and Co, Mo, and other alloying elements like Ni, Al, and impurities to optimize the maraging steel's composition, combined with forging and cryogenic treatment to refine the internal structure and enhance both strength and plasticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-content Ni and Ti elements are added to strengthen the maraging steel by using precipitate Ni3Ti, then the strength of the maraging steel is improved, but Ti is prone to reaction with impurity element N to generate TiN inclusions, which lead to reduction in plasticity of the material
Solution Approach 1:
The patent optimizes the content parameters of alloying elements (Ni: 15-18 wt%, Ti: 0.4-1.5 wt%, Co: 12-17 wt%, Mo: 6-8 wt%, Al: ≤0.3 wt%) to achieve the right balance between strength and plasticity. By precisely controlling these compositional parameters, the steel achieves tensile strength ≥2500 MPa while maintaining elongation ≥12%, resolving the contradiction between strength improvement and plasticity preservation
Solution Approach 2:
The patent introduces Co and Mo as intermediary elements that facilitate the formation of fine, uniformly distributed precipitates (Ni3Co, Ni3Mo, Ni3Ti) instead of coarse TiN inclusions. These intermediary precipitates provide strengthening while maintaining matrix integrity and plasticity, acting as mediators between the strengthening mechanism and the harmful TiN inclusion formation
2Strength
If the content of Ti is increased to improve strength, then the precipitate strengthening effect is enhanced, but large-size Ti inclusions are generated, which reduce plasticity of the steel
Solution Approach 1:
The patent changes the Ti content parameter from high (conventional) to controlled low (0.4-1.5 wt%), and compensates the strength by adjusting Ni (15-18 wt%), Co (12-17 wt%), and Mo (6-8 wt%) content parameters. This parameter transformation prevents large TiN inclusion formation while maintaining strength through fine precipitate distribution and matrix strengthening mechanisms
Solution Approach 2:
The patent creates a composite strengthening system involving multiple precipitate phases (Ni3Co, Ni3Mo, Ni3Ti) distributed in the martensite matrix, rather than relying solely on Ti-based precipitates. This composite approach provides synergistic strengthening while avoiding the harmful effects of excessive Ti content, achieving both high strength and high plasticity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The maraging steel achieves tensile strengths and yield strengths greater than 2500 MPa with elongation rates greater than 12% and reduction of area greater than 60%, ensuring high strength and plasticity for various load-bearing applications.
Implementation Method 1
High-content Ni and Ti elements are added to an existing maraging steel to strengthen a material by using a precipitate, namely, an intermetallic compound Ni3Ti
Implementation Method 2
performing deep cryogenic treatment and aging treatment on the steel ingot obtained through the plurality of forgings
Data Source
AI summary
Embodiments of this application provide a maraging steel, a method for preparing a maraging steel, and an electronic device. The maraging steel includes the following alloy elements: Co, Mo, and Ti. By weight percentage, a content of Co ranges from 12 wt % to 17 wt %, a content of Mo ranges from 6 wt % to 8 wt %, and a content of Ti ranges from 0.4 wt % to 1.5 wt %. The maraging steel further includes the following alloy elements: Ni, Al, Fe, and an impurity element. By weight percentage, a content of Ni ranges from 15 wt % to 18 wt %, Al≤0.3 wt %, and the remainder is Fe and the impurity element. Embodiments of this application provide the maraging steel, the method for preparing a maraging steel, and the electronic device, so that the maraging steel can have both a high strength and high plasticity.