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A heat treatment process for improving the strength of nickel-based superalloy at room temperature

A nickel-based superalloy, room temperature technology, applied in the field of nickel-based superalloy heat treatment, can solve the problems of cumbersome process, long aging time of heat treatment process, etc., achieve good mutual matching, improve the room temperature strength of the alloy, and increase the effect of γ' phase content

Active Publication Date: 2022-04-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent (patent No. CN109306399A) adds a step of 730°C aging treatment on the basis of the standard heat treatment process of GH4738 alloy, and improves the room temperature tensile performance of GH4738 bolt products by increasing the γ′ phase volume fraction, but the aging time of this heat treatment process is relatively short. Long, the process is more cumbersome

Method used

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  • A heat treatment process for improving the strength of nickel-based superalloy at room temperature
  • A heat treatment process for improving the strength of nickel-based superalloy at room temperature
  • A heat treatment process for improving the strength of nickel-based superalloy at room temperature

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Effect test

specific Embodiment 1

[0025] Step 1: The GH4738 alloy forging is heated at a rate of 15 °C / min to 1030 °C for solution treatment for 30 minutes, and after taking it out, it is cooled to room temperature at a rate of 400-600 °C / min by blowing strong wind;

[0026] Step 2: The GH4738 alloy forging is heated to 760°C at a rate of 20°C / min for aging treatment for 14 hours, and then cooled to room temperature with the furnace.

specific Embodiment 2

[0028] Step 1: The GH4738 alloy forging is heated at a rate of 20 °C / min to 1020 °C for solution treatment for 50 min, and after taking it out, it is cooled to room temperature at a rate of 400-600 °C / min by blowing strong wind;

[0029] Step 2: The GH4738 alloy forging was aged at a rate of 25°C / min to 750°C for 16 hours, and then cooled to room temperature with the furnace.

[0030] The test results of the mechanical properties of several groups of furnace samples show that the strength value of the GH4738 alloy at room temperature has been significantly improved after being treated by the heat treatment process of the present invention. 40, 45MPa.

[0031] The results of the mechanical properties tested with the furnace samples are shown in Table 2;

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Abstract

The invention discloses a heat treatment process for improving the strength of a nickel-based superalloy at room temperature, and belongs to the technical field of nickel-based superalloy heat treatment. The heat treatment process of the present invention includes solid solution and aging treatment: the alloy is first solution treated in the range of 1010-1030°C for 20-50min, and after taking it out, it is cooled to room temperature by blowing strong wind; then it is aged in the range of 740-760°C for 14-16h , cooled to room temperature with the furnace. In this heat treatment process, the cooling rate of the alloy after solution treatment is between water cooling and air cooling; after single-stage aging treatment, it is cooled by furnace cooling, which has a good match with the solution treatment process. After aging, fine and dispersed secondary γ′ phases are obtained, and a large number of small-sized tertiary γ′ phases are distributed around the primary γ′ phases, which play a supplementary strengthening role. Compared with the standard heat treatment process, this process is simple and efficient, and has unexpected effects in improving the strength of the alloy at room temperature, in which the tensile strength and yield strength can be increased by up to 40 and 45 MPa respectively.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of nickel-based superalloys, and in particular relates to a heat treatment process for improving the strength of nickel-based superalloys at room temperature. Background technique [0002] Superalloys are irreplaceable key structural materials for military and civil aero-engines and high-temperature parts of gas turbines. With the rapid development of the aviation and shipbuilding industry, the high temperature resistance performance of its key component materials is getting higher and higher. Nickel-based superalloys have been successfully applied to high-temperature end parts of aero-engines and marine gas turbines due to their excellent properties such as high service temperature, stable structure, less harmful phases, and strong oxidation resistance. For this reason, a large number of studies have analyzed how to improve the performance of nickel-based superalloys in high-temperature e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/10C22C19/05
CPCC22F1/10C22C19/055
Inventor 郑磊刘红亮赵鑫董建孟晔
Owner UNIV OF SCI & TECH BEIJING
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