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A cryogenic treatment process for aermet100 steel

A cryogenic treatment and process technology, applied in the field of cryogenic treatment of AerMet100 steel, can solve the problems of thermal shock, brittle fracture, and the comprehensive effects of cryogenic treatment are not considered, so as to improve fatigue performance, prevent cracking, and prolong crack initiation life. Effect

Active Publication Date: 2020-03-10
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the fatigue performance of alloy high-speed steel B318 is studied by using the cold treatment process. The disadvantage of the process is that it is directly cold-treated after austenitization, which is easy to cause thermal shock and brittle fracture of the material.
In addition, the cold treatment temperature used in the prior art is as low as -70°C, which does not take into account the comprehensive influence of cryogenic treatment (-100°C ~ -196°C) on phase transformation, and thus ignores the impact of cryogenic treatment on fatigue properties
At present, the technology of using cryogenic treatment to improve the fatigue performance of AerMet100 steel has not been reported

Method used

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  • A cryogenic treatment process for aermet100 steel
  • A cryogenic treatment process for aermet100 steel
  • A cryogenic treatment process for aermet100 steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] refer to Figure 1-2 , a cryogenic treatment process for AerMet100 steel, comprising the following steps:

[0051] Heat AerMet100 steel at a heating rate of 10min / °C to 885°C, keep it warm for 1h, and then cool it to room temperature with oil quenching; within 8h after quenching, perform cryogenic treatment, cool it to -115°C at a cooling rate of 3°C / min, and keep it warm for 1h. Take it out from the cryogenic box and air-cool to room temperature; temper within 4 hours, then heat to 482°C at a rate of 10min / °C for tempering, hold for 5 hours, and air-cool to room temperature to prepare the sample

[0052] The standard GB / T228.1 metal room temperature tensile test method was used to carry out the tensile test on the sample, and the test results are listed in Table 1.

Embodiment 2

[0054] A cryogenic treatment process for AerMet100 steel, comprising the following steps:

[0055] Heat the AerMet100 steel to 885°C at a heating rate of 10min / °C, keep it warm for 1h, and then cool it to room temperature with oil quenching; within 8h after quenching, perform cryogenic treatment, cool it to -120°C at a cooling rate of 4°C / min, and keep it warm for 1h. Take it out from the cryogenic box and air-cool to room temperature; temper within 4 hours, then heat to 482°C at a rate of 10min / °C for tempering, hold for 5 hours, and air-cool to room temperature to prepare the sample

[0056] The standard GB / T228.1 metal room temperature tensile test method was used to carry out the tensile test on the sample, and the test results are listed in Table 1.

Embodiment 3

[0058] A cryogenic treatment process for AerMet100 steel, comprising the following steps:

[0059] Heat AerMet100 steel to 885°C at a heating rate of 10min / °C, keep it warm for 1h, and then cool it to room temperature with oil quenching; within 8h after quenching, perform cryogenic treatment, cool it to -125°C at a cooling rate of 5°C / min, and keep it warm for 1h. Take it out from the cryogenic box and air-cool to room temperature; temper within 4 hours, then heat to 482°C at a rate of 10min / °C for tempering, hold for 5 hours, and air-cool to room temperature to prepare the sample.

[0060] The standard GB / T228.1 metal room temperature tensile test method was used to carry out the tensile test on the sample, and the test results are listed in Table 1.

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Abstract

The invention discloses a subzero treatment technology of AerMet100 steel. The subzero treatment technology comprises the following steps that solid solution treatment is carried out, concretely, theAerMet100 steel is subjected to the solid solution treatment, is subjected to heat preservation, is put into quenching oil for quenching, and is cooled to the room temperature; subzero treatment is carried out, concretely, the AerMet100 steel after being subjected to the solid solution treatment is subjected to the subzero treatment, the cooling rate is 3-5 DEG C / min, the subzero temperature is set as (-115) DEG C to (-125) DEG C, and after being subjected to the heat preservation, the AerMet100 steel is taken out and is subjected to air cooling until the temperature is recovered to the room temperature; and tempering treatment is carried out, concretely, the AerMet100 steel after being subjected to the subzero treatment is subjected to the tempering treatment, then is subjected to heat preservation, and is subjected to the air cooling to the room temperature. After the solid solution treatment, oil quenching is carried out in advance, the air cooling to the room temperature is carriedout, and then the subzero treatment is carried out, so that damage of rapid cooling and rapid heating on materials is avoided. In the subzero treatment process, a sample is cooled below -100 DEG C, so that the fatigue property of the AerMet100 steel is improved substantially.

Description

technical field [0001] The invention relates to a cryogenic treatment process, in particular to a cryogenic treatment process of AerMet100 steel. Background technique [0002] Aermet100 steel is a high-alloy ultra-high-strength steel with excellent comprehensive mechanical properties and is often used as a material for aircraft landing gear. In engineering, fatigue failure accounts for more than 80% of the total number of mechanical failures. AerMet100 steel is used as an aircraft landing gear material, and the improvement of its fatigue performance is of great significance for the practical application of landing gear. [0003] After standard treatment (885°Cx1h, oil quenching + -73°Cx1h cryogenic treatment + 482°Cx5h tempering), the composition phase of Aermet100 steel consists of lath martensite, retained austenite, reverse transformed austenite and Composition of dispersed precipitates. The transformation of retained austenite to martensite occurs in the process of coo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D6/04C21D1/18
CPCC21D1/18C21D6/04
Inventor 崔金艳张书彦温树文
Owner CENT OF EXCELLENCE FOR ADVANCED MATERIALS
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