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Low carbon martensite aged stainless steel with high strength high toughness and high decay resistance performances

A low-carbon martensite, high-strength and high-toughness technology, which is applied in the field of iron-nickel-based martensitic precipitation hardening alloys, can solve the problems of low toughness and only reach the highest strength, and achieve the effect of high strength

Inactive Publication Date: 2010-11-17
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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  • Low carbon martensite aged stainless steel with high strength high toughness and high decay resistance performances
  • Low carbon martensite aged stainless steel with high strength high toughness and high decay resistance performances
  • Low carbon martensite aged stainless steel with high strength high toughness and high decay resistance performances

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] According to the following nominal composition (weight percentage): C: 0.11%, Cr: 12.0%, Ni: 5.0%, Ti: 0.8%, Mo: 0.5%, Cu: 2.1%, Co: 2.0%, Nb: 0.5%, Mn: 0.6%, Si: 1.2%, N: 0.005%, V: 0.004%, Al: 0.008%, and Fe: the balance. After mixing, the materials are put into a vacuum induction furnace for smelting. The molten ingot is then subjected to thermal processing and heat treatment according to the following process conditions:

[0032] (1) Heating forging in austenite single-phase zone, forging pressure ratio of 7, air cooling after forging;

[0033] (2) Hot rolling after forging, the initial rolling temperature is 1150°C, the final rolling temperature is 800°C, air cooling after rolling, the cumulative reduction of hot rolling reaches 80%;

[0034] (3) Heat treatment system: 1150℃ solution treatment / 2h / oil quenching to room temperature +450-550℃ aging treatment / 6min-24h / air cooling to room temperature.

[0035] The materials were processed into specimens after heat treatment, a...

Embodiment 2

[0041] The difference from Example 1 is that the content of some alloying elements is adjusted, and the type and quantity of precipitates are changed to obtain mechanical properties different from Example 1.

[0042] According to the following nominal composition (weight percentage): C: 0.1%, Cr: 11.9%, Ni: 4.1%, Ti: 0.3%, Mo: 0.5%, Cu: 2.0%, Co: 3.0%, Nb: 0.2%, Mn: 0.6%, Si: 1.0%, Al: 0.005%, N: 0.007%, V: 0.006%, and Fe: the balance. After mixing, the materials are put into a vacuum induction furnace for smelting. The smelted ingot was then subjected to thermal processing and heat treatment according to the process conditions described in Example 1.

[0043] The materials were processed into samples after heat treatment, and their tensile properties at room temperature were tested respectively, and the tensile fracture was observed by scanning electron microscope. The tensile results are shown in Table 4, and the typical fracture morphology is as figure 2 Shown.

[0044] Table 4...

Embodiment 3

[0048] The difference from Example 1 lies in the fact that based on the experience of Example 2, the content of some alloying elements is adjusted, and the type and quantity of precipitated phases are changed to obtain mechanical properties superior to Example 1 and Example 2.

[0049] According to the following nominal composition (weight percentage): C: 0.1%, Cr: 11.5%, Ni: 4.1%, Ti: 0.5%, Mo: 0.5%, Cu: 2.0%, Co: 2.0%, Nb: 0.1%, Mn: 0.6%, Si: 0.5%, Al: 0.005%, N: 0.003%, V: 0.004% and Fe: the balance. After mixing, the materials are put into a vacuum induction furnace for vacuum melting. The smelted ingot was then subjected to thermal processing and heat treatment according to the process conditions described in Example 1.

[0050] The materials were processed into samples after heat treatment, and their tensile properties at room temperature were tested respectively, and the tensile fracture was observed by scanning electron microscope. The tensile results are shown in Table 5....

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Abstract

The invention belongs to the ferronickel base martensite precipitation-hardening alloy technical field, in particular relates to a low carbon martensite aged stainless steel with high strength high toughness and high decay resistance performances, novel material mainly applied to the important fields of aviation, space flight, machinery manufacturing and atomic energy. The steel comprises the following components by weight percent: 0.08-0.15% of C, 11.0-12.0% of Cr, 4.0-5.0% of Ni, 0.2-1.0% of Ti, 0.5-1.0% of Mo, 2.0-3.0% of Cu, 2.0-3.0% of Co, 0.1-0.5% of Nb, 0.5-1.5% of Mn, 0.5-1.5% of Si, less than 0.01% of N, less than 0.01% of V, less than 0.01% of Al and balance of Fe. The invention can obtain high strength high toughness and decay resistance performances by appropriate collocation of five precipitation strength elements of Ni, Ti, Mo, Cu and Nb.

Description

Technical field [0001] The invention belongs to the technical field of iron-nickel-based martensitic precipitation hardening alloys, and specifically relates to a low-carbon maraging stainless steel with high strength, high toughness and high corrosion resistance. It is mainly used in aviation, aerospace, machinery New materials in important fields such as manufacturing and atomic energy. 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. Existing ultra-high-strength steel 30CrMnSiNi2A, 300M, 18Ni steel, etc. have been widely used in important parts of aerospace vehicles, and its strength level is above 1600MPa, K IC At 80MPa·m 1 / 2 the above. However, its corrosion resistance, especially the corrosion resistance of the marine environment, is poor, and cannot meet the requirements of steel for components in the environment ...

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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