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An ultra-high-strength maraging stainless steel strengthened by b2 nanoparticle coherent precipitation and its preparation method

An ultra-high-strength, nano-particle technology, applied in the field of high-strength stainless steel, can solve the problems of reduced strength, increased brittleness, and unsatisfactory ultra-high strength of maraging steel, etc., to achieve material cost reduction, good plastic toughness, and improved uniformity Effect of Plastic Deformability

Active Publication Date: 2021-09-24
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of Cr element makes maraging steel have excellent corrosion resistance, but it will inevitably lead to the increase of brittleness of this type of steel, thus reducing the strength
Such as a typical maraging stainless steel 13-8Mo (Fe-13Cr-8Ni-2Mo-1Al-0.05C, wt.%), adding Cr to improve the corrosion resistance of the steel, although it is also strengthened by coherent precipitation of B2 nanoparticles , but the room temperature yield strength of the steel is only 1400MPa, which does not meet the requirements of ultra-high strength of maraging steel, which indicates that the alloy composition of the steel still needs to be further adjusted and optimized to obtain ultra-high strength maraging stainless steel

Method used

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  • An ultra-high-strength maraging stainless steel strengthened by b2 nanoparticle coherent precipitation and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Fe-5.30 CR-13.47NI-3.10Al-1.22Mo-0.50W-0.23NB-0.03C-0.005B (wt.%) Alloy

[0021] Step 1: Alloy preparation

[0022] High-purity metal materials are used for ingredients according to quality percent. The ingredients were repeatedly repeatedly repeated by a vacuum non-power consuming arc melting furnace under argon atmosphere to obtain a co-hemor with a uniform mass of about 100 g, and the mass loss in the smelting process does not exceed 0.1%. The homogenization treatment of 1250 ° C / 2H was carried out with a muffle furnace. Subsequently, multiple cold rolling, the pressure is not more than 0.2 mm per second, with a total deformation amount of about 70% to give a plate sample having a thickness of about 3 mm. The annealing treatment of 950 ° C / 15 min was then subjected to a time limit of 500 ° C / 8 h.

[0023] Step 2: Alloy tissue structure and mechanical properties and corrosion resistance test

[0024] The alloy tissue and structure after the stabilization ...

Embodiment 2

[0025] Example 2: Fe-4.0Cr-15.0 Ni-3Al-1MO-0.70W-0.2NB-0.03C-0.004B (wt.%) Alloy

[0026] Step 1: Alloy preparation

[0027] High-purity metal materials are used for ingredients according to quality percent. The ingredients were repeatedly repeatedly repeated by a vacuum non-power consuming arc melting furnace under argon atmosphere to obtain a co-hemor with a uniform mass of about 100 g, and the mass loss in the smelting process does not exceed 0.1%. The homogenization treatment of 1250 ° C / 2H was carried out with a muffle furnace. Subsequently, multiple cold rolling, the pressure is not more than 0.2 mm per second, with a total deformation amount of about 70% to give a plate sample having a thickness of about 3 mm. The annealing treatment of 950 ° C / 15 min was then subjected to a time limit of 500 ° C / 12 h.

[0028] Step 2: Alloy organizational structure and mechanical performance test

[0029] With OM, SEM, and XRD detection, the alloy tissue and structure showed that the...

Embodiment 3

[0030] Example 3: Fe-6.0Cr-13.0 Ni-4.0Al-2.0Mo-0.50W-0.40NB-0.05C-0.008B (wt.%) Alloy

[0031] Step 1: Alloy preparation

[0032] Using a high-purity metal, ingredients are performed according to the percentage of mass. The ingredients were repeatedly repeatedly repeated by a vacuum non-power consuming arc melting furnace under argon atmosphere to obtain a co-hemor with a uniform mass of about 100 g, and the mass loss in the smelting process does not exceed 0.1%. The homogenization treatment of 1250 ° C / 2H was carried out with a muffle furnace. Subsequently, multiple cold rolling, the pressure is not more than 0.2 mm per second, with a total deformation amount of about 70% to give a plate sample having a thickness of about 3 mm. The annealing treatment of 950 ° C / 15 min was subsequently carried out, and the aging of 500 ° C / 48 h was finalized.

[0033] Step 2: Alloy tissue structure and mechanical properties and corrosion resistance test

[0034] With OM, SEM, and XRD detect...

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Abstract

An ultra-high-strength maraging stainless steel strengthened by coherent precipitation of B2 nanoparticles and a preparation method thereof, belonging to the field of high-strength stainless steel, including Fe, Cr, Ni, Al, Mo, W, Nb, C, B elements, Si, Mn, S, P, O, and N are impurity elements, and the mass percentage (wt.%) of the alloy composition is Cr: 4.0-6.0, Ni: 13.0-15.0, Al: 3.0-4.0, Mo: 1.0-2.0, W : 0.3~0.7, Nb: 0.2~0.4, C: 0.03~0.05, B: 0.004~0.008, Si≤0.20, Mn≤0.20, S≤0.01, P≤0.02, O≤0.005, N≤0.02, Fe: Yu The amount, and the atomic percentage ratio of Nb / C is 1:1, and the atomic percentage ratio of Cr / (Mo+W) is 8:1. The invention realizes the uniform coherent precipitation of high-density B2 phase nanoparticles on the martensitic matrix through the design of the alloy composition, so that the alloy has an ultra-high strength higher than 2.0GPa, good uniform plastic deformation ability, excellent resistance corrosion resistance; and the preparation process is simple, the material cost is greatly reduced, and it is a new type of ultra-high-strength maraging stainless steel.

Description

Technical field [0001] The present invention is a high strength stainless steel, and more particularly, to a nanoparticle B2 coherent precipitation strengthening BCC group ultrahigh strength maraging stainless steel and preparation, their strength exceeding 2.0 GPa, an elongation of more than 8.0%. Background technique [0002] As a maraging steel ultra high strength steel widely used in cutting-edge fields such as aviation, aerospace and military, has high research value and significance of the project. Conventional maraging steel is a ultra-low carbon (or carbonless) having a high density of dislocations of lath martensite (BCC group) as the substrate, aging treatment after formation of the matrix more coherent or non-coherent half intermetallic compound (Ni 3 Ti, Ni 3 Mo and Fe 2 (Mo, Ti)) be fortified. These precipitates are often a larger interface between the substrate and the presence of energy having a higher nucleation barrier, easily nucleates at the grain boundaries an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/48C22C38/54C22C33/04C21D8/02C21D1/26
CPCC22C38/02C22C38/06C22C38/44C22C38/48C22C38/54C22C38/04C22C38/002C22C38/001C22C33/04C21D8/0236C21D1/26C21D2211/008
Inventor 王清王镇华董闯
Owner DALIAN UNIV OF TECH
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