A Heat Treatment Process for Improving the Fatigue Life of gh4738 Alloy

A technology for fatigue life and nickel-based superalloys, which is applied in the field of heat treatment of high-temperature alloys, can solve problems such as alloy initiation cracks and lower alloy service performance, and achieve the effects of improving fatigue life, inhibiting growth, and improving alloy fatigue life

Active Publication Date: 2022-04-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with single crystal nickel-based superalloys, there are more interface regions in polycrystalline GH4738 alloys, and metastable interface regions (especially grain boundaries) tend to precipitate larger-sized massive carbides during heat treatment. , the alloy in service is easy to initiate cracks here, thereby reducing the service performance of the alloy, especially the thermal fatigue performance

Method used

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  • A Heat Treatment Process for Improving the Fatigue Life of gh4738 Alloy
  • A Heat Treatment Process for Improving the Fatigue Life of gh4738 Alloy
  • A Heat Treatment Process for Improving the Fatigue Life of gh4738 Alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The first step, raw material preparation:

[0029] The GH4738 nickel-based superalloy with the following components is selected according to the mass fraction: carbon 0.08%, chromium 19.61%, cobalt 13.55%, molybdenum 4.23%, titanium 2.98%, aluminum 1.47%, boron 0.007%, zirconium 0.11%, and the balance is nickel. Cut the alloy into Try on sticks, wash and dry until ready to use.

[0030] The second step, solution treatment:

[0031] The GH4738 alloy sample was heated to 1020°C for solution treatment at a heating rate of 25°C / min for 60 minutes, and then the alloy sample was cooled to 800°C by flowing air in the heat treatment furnace, and the cooling rate at this stage was 40°C / min; Remove and air cool to room temperature.

[0032] The third step, aging treatment:

[0033] The GH4738 alloy sample was heated to 770°C for 8 hours at a heating rate of 25°C / min, and then air-cooled to room temperature.

Embodiment 2

[0035] The first step, raw material preparation:

[0036] The GH4738 nickel-based superalloy with the following components is selected according to the mass fraction: carbon 0.08%, chromium 19.61%, cobalt 13.55%, molybdenum 4.23%, titanium 2.98%, aluminum 1.47%, boron 0.007%, zirconium 0.11%, and the balance is nickel. Cut the alloy into Try on sticks, wash and dry until ready to use.

[0037] The second step, solution treatment:

[0038] The GH4738 alloy sample was heated to 1025°C for solution treatment at a heating rate of 20°C / min for 70 minutes, and then the alloy sample was cooled to 800°C by flowing air in the heat treatment furnace, and the cooling rate at this stage was 45°C / min; Remove and air cool to room temperature.

[0039] The third step, aging treatment:

[0040] The GH4738 alloy sample was heated to 765°C for 9 hours at a heating rate of 20°C / min, and then air-cooled to room temperature.

Embodiment 3

[0042] The first step, raw material preparation:

[0043] The GH4738 nickel-based superalloy with the following components is selected according to the mass fraction: carbon 0.08%, chromium 19.61%, cobalt 13.55%, molybdenum 4.23%, titanium 2.98%, aluminum 1.47%, boron 0.007%, zirconium 0.11%, and the balance is nickel. Cut the alloy into Try on sticks, wash and dry until ready to use.

[0044] The second step, solution treatment:

[0045] The GH4738 alloy sample was heated to 1030°C for solution treatment at a heating rate of 25°C / min for 60 minutes, and then the alloy sample was cooled to 800°C by flowing air in the heat treatment furnace, and the cooling rate at this stage was 60°C / min; Remove and air cool to room temperature.

[0046] The third step, aging treatment:

[0047] The GH4738 alloy sample was heated to 760 °C for 10 h at a heating rate of 30 °C / min, and then air-cooled to room temperature.

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Abstract

The invention discloses a heat treatment process for improving the fatigue life of GH4738 alloy, which belongs to the technical field of high temperature alloy heat treatment. The process steps are as follows: the GH4738 alloy is subjected to solution treatment at 1000-1030°C, first slowly cooled and then air-cooled out of the furnace; then aged at 760-780°C, and air-cooled to room temperature after being out of the furnace. This heat treatment process optimizes the distribution of grain boundary carbides in the matrix, which increases the fatigue cycle of the alloy by more than 36% under fatigue test conditions, greatly improves the fatigue life of the GH4738 alloy, and further improves the service safety of alloy components. The technical advantage of this heat treatment process is obvious, and the market promotion prospect is broad.

Description

technical field [0001] The invention relates to the technical field of high-temperature alloy heat treatment, more specifically, it relates to a heat treatment process for improving the fatigue life of GH4738 alloy. Background technique [0002] With the continuous development of the aviation industry, the development and research of superalloys are becoming more and more important. Superalloys (also known as heat-resistant alloys or superalloys) usually refer to metal materials that can still work normally according to the design requirements under high temperature conditions of 600-1200 °C. Anti-fatigue performance, fracture toughness, and strong oxidation resistance and thermal corrosion resistance and other comprehensive properties are widely used in the aviation field. [0003] The aero-engine is known as the "Flower of Industry", and it is one of the most technical and difficult parts in the aviation industry. In the development process of aero-engine as an aircraft ...

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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