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Deformation induced maraging stainless steel and machining process thereof

A processing technology and stainless steel technology, which is applied in the field of iron-nickel-based martensitic precipitation hardening alloy, can solve the problems of only reaching the highest strength and low toughness, achieve high strength, high corrosion resistance, and improve the effect of strength and plasticity

Inactive Publication Date: 2011-03-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After aging treatment at 450-500°C, these materials can obtain good stress corrosion resistance and high tensile strength, but their highest strength can only reach 1500MPa
And some maraging stainless steels with a strength of 2000MPa, such as AFC-77 used in the United States for C5A and C17 transport aircraft engine equipment materials, have very low toughness, only 20MPa m 1 / 2

Method used

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  • Deformation induced maraging stainless steel and machining process thereof
  • Deformation induced maraging stainless steel and machining process thereof
  • Deformation induced maraging stainless steel and machining process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] According to the following nominal composition (weight percent): C: 0.005%, Cr: 11.96%, Ni: 13.3%, Ti: 2.07%, Mo: 0.51%, Cu: 0.54%, Co: 1.72%, Nb: 0.006%, Mn: 0.60%, Si: 0.32%, V: 0.005%, Al: 1.4%, N: 0.004%, and Fe: balance. After mixing, put it into a vacuum induction furnace for melting. After smelting, the ingot is then subjected to thermal processing and heat treatment according to the following process conditions:

[0036] (1) Heated forging in the austenitic single-phase zone, the forging-pressure ratio is 7, and air-cooled to room temperature after forging;

[0037] (2) Hot rolling after forging, the initial rolling temperature is 1150°C, the final rolling temperature is 800°C, air-cooled to room temperature after rolling, and the cumulative reduction of hot rolling reaches 84%; in this embodiment, hot rolling is carried out in seven passes, The reduction per pass is 12%.

[0038] (3) cold-rolling the plate after hot-rolling, and the cold-rolling deformation is...

Embodiment 2

[0043] The difference from Example 1 is that the content of some alloy elements is adjusted, and the type and quantity of precipitated phases are changed, so as to obtain mechanical properties different from Example 1.

[0044] According to the following nominal composition (weight percent): C: 0.0065%, Cr: 11.90%, Ni: 11.9%, Ti: 1.62%, Mo: 0.52%, Cu: 2.09%, Co: 2.11%, Nb: 0.003%, Mn: 0.61%, Si: 0.82%, Al: 2.0%, V: 0.0024%, N: 0.005%, and Fe: balance. After mixing, put it into a vacuum induction furnace for melting. The ingot after smelting is subjected to thermal processing and heat treatment according to the process conditions described in Example 1.

[0045] The material was processed into samples after cold rolling and heat treatment, and its room temperature tensile properties, fracture toughness and corrosion resistance were tested respectively, and the tensile fracture was observed by scanning electron microscope. Metallographic structure after cold rolling Figure 4...

Embodiment 3

[0048] The difference from Example 1 and Example 2 is that the cold deformation reduction is adjusted based on the experience of the previous two examples to obtain better mechanical properties than those of Example 1 and Example 2.

[0049] According to the materials described in Example 1 and Example 2, after hot rolling is carried out according to the process conditions described in Example 1, the reduction is reduced from 60% to 40% during cold rolling, and then the sample after cold rolling is 1150 ° C. Solution treatment / 2h / oil quenching to room temperature, then aging treatment at 550°C for 24 hours, then air cooling.

[0050] The materials were processed into samples after heat treatment, and their tensile properties at room temperature were tested respectively.

[0051] Tensile results show that the mechanical properties of the material in Example 1 at room temperature are: the tensile strength is 1410MPa, the yield strength is 1320MPa, the elongation is 24.3%, and th...

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Abstract

The invention belongs to the field of iron nickel-based martensite precipitation hardening-type alloys, and in particular relates to deformation induced maraging stainless steel with high strength, high toughness and high corrosion resistance and a machining process thereof. The stainless steel is a novel material mainly applied to the important fields of aviation, spaceflight, machinofacture, atomic energy and the like. The steel comprises the following components in percentage by weight: 11.0-13.0 percent of Cr, 11.0-14.0 percent of Ni, 1.5-2.1 percent of Ti, 0.1-1.0 percent of Mo, 0.5-2.0 percent of Cu, 1.5-2.2 percent of Co, 0.5-1.5 percent of Mn, 0.1-1.0 percent of Si, 1.0-2.0 percent of Al, less than 0.01 percent of Nb, less than 0.01 percent of C, less than 0.01 percent of N, less than 0.01 percent of V and the balance of Fe. The machining process comprises the following steps of: (1) heating and forging in an austenite single phase zone, and air-cooling to the room temperature after the forging is ended, wherein the forge and press ratio is 6-9; (2) hot-rolling after the forging is ended and air-cooling to the room temperature after the rolling is ended, wherein the blooming temperature is 1100-1200 DEG C, and the finished rolling temperature is 800-900 DEG C. The invention obtains a martensite matrix with high-order dislocation density through deformation induced martensite phase change and simultaneously obtains high strength, high toughness and high corrosion resistance through adding the proper matching of precipitation strength elements, such as Ni, Ti, Mo, Cu and the like.

Description

technical field [0001] The invention belongs to the field of iron-nickel-based martensitic precipitation-hardening alloys, and specifically relates to a deformation-induced maraging stainless steel with high strength, high toughness and high corrosion resistance and a processing technology thereof, which is mainly used in aviation and aerospace , machinery manufacturing, atomic energy and other important fields of new materials. Background technique [0002] The research, development and improvement of ultra-high-strength maraging steel are closely related to the higher requirements for materials in high-tech fields such as aerospace. The existing ultra-high-strength steel 30CrMnSiNi2A, 300M, 18Ni steel, etc. have been widely used in important parts of aerospace vehicles, with a strength level above 1600MPa and a fracture toughness of K IC At 80MPa·m 1 / 2 above. However, its corrosion resistance, especially its poor corrosion resistance in marine environments, cannot meet ...

Claims

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Application Information

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IPC IPC(8): C22C38/52C21D8/00
Inventor 王威严伟单以银杨柯
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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