Heat treatment method of low-expansion high-temperature alloy

A heat treatment method and technology for superalloys, applied in the field of heat treatment of low-expansion superalloys, can solve the problems of high notch sensitivity and insufficient comprehensive properties of alloys, and achieve the effects of improving high-temperature durability, eliminating notch sensitivity, and improving strength

Inactive Publication Date: 2019-01-04
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the comprehensive performance of the alloy after heat treatment in the prior art is insufficient, especially the notch sensitivity is high

Method used

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  • Heat treatment method of low-expansion high-temperature alloy
  • Heat treatment method of low-expansion high-temperature alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] GH2909 alloy was tested for composition and met the requirements: C: ≤0.06%, Ni: 35%-40%, Co: 12%-16%, Nb+Ta: 4.3%-5.2%, Ti: 1.3%-1.8%, Si: 0.36% to 0.5%, B: ≤0.012%, Al: ≤0.2%.

[0033] The microstructure of the GH2909 alloy before heat treatment was tested, and the requirements were met: equiaxed grain microstructure, and the grain boundary contained a very small amount of Laves phase.

[0034] The GH2909 alloy is subjected to standard heat treatment. The specific process is: 980°C for 1h, air cooling; 720°C for 8h, 55°C / h furnace cooling to 620°C for 8h, air cooling.

[0035] The GH2909 alloy is subjected to bent crystal heat treatment, the specific process is: 880°C for 40 minutes, air cooling; 980°C for 1 hour, air cooling; 720°C for 8 hours, 55°C / h furnace cooling to 620°C for 8 hours, air cooling.

[0036] The alloy microstructure after standard heat treatment was tested, the results are as follows figure 1 shown.

[0037] The microstructure of the alloy after...

Embodiment 2

[0040] The composition of GH2909 alloy is tested and meets the requirements: C: ≤0.06, Ni: 35%-40%, Co: 12%-16%, Nb+Ta: 4.3%-5.2%, Ti: 1.3%-1.8%, Si : 0.36% to 0.5%, B: ≤0.012, Al: ≤0.2.

[0041] The microstructure of the GH2909 alloy before heat treatment was tested, and the requirements were met: equiaxed grain microstructure, no Laves phase precipitation at the grain boundary.

[0042] The GH2909 alloy is subjected to standard heat treatment. The specific process is: 980°C for 1h, air cooling; 745°C for 4h, 55°C / h furnace cooling to 620°C for 4h, air cooling.

[0043] The GH2909 alloy is subjected to bent crystal heat treatment, the specific process is: 880°C for 1min, air cooling; 980°C for 1h, air cooling; 745°C for 4h, 55°C / h furnace cooling to 620°C for 4h, air cooling.

[0044] The detection of alloy microstructures after standard heat treatment and bent-grain heat treatment found that after bent-grain heat treatment, more grain boundary Laves phases can be obtained, ...

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Abstract

The invention discloses a heat treatment method of low-expansion high-temperature alloy, and particularly relates to the heat treatment method of the low-expansion high-temperature alloy in the fieldof heat treatment of metal materials. The heat treatment method of the low-expansion high-temperature alloy, provided by the invention, comprises the following steps: A, heating the alloy to 820-920 DEG C, preserving heat for 20 min to 2 h, and then performing air cooling; B, heating the alloy to 960-980 DEG C, preserving heat for 30 min to 2 h, and then performing air cooling; C, heating the alloy to 720-745 DEG C, and preserving heat for 4-8 h; and D, cooling the alloy to 620 DEG C at a cooling speed of 55 DEG C/h, preserving heat for 4 h, and then performing air cooling. By the heat treatment method of the low-expansion high-temperature alloy, the comprehensive performance of the alloy can be improved and the notch sensitivity of the alloy can be eliminated.

Description

technical field [0001] The invention relates to a low-expansion high-temperature alloy heat treatment method, in particular to a low-expansion high-temperature alloy heat treatment method in the field of metal material heat treatment. Background technique [0002] GH2909 alloy is a Fe-Ni-Co based age-hardening low-expansion superalloy, which is widely used in aerospace and industrial fields. The actual production process of GH2909 alloy includes alloy smelting, thermal processing and heat treatment. Among them, the heat treatment process is the final treatment process of GH2909 alloy, and it is also the most effective way to improve the strength, plasticity and high-temperature durability of GH2909 alloy and eliminate the sensitivity of the alloy gap. important link. [0003] At present, the standard heat treatment system of GH2909 alloy includes: A---980°C for 1h, air cooling; 720°C for 8h, furnace cooling at 55°C / h to 620°C for 8h, air cooling; B---980°C for 1h, air cooli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22F1/10
CPCC22C19/03C22C30/00C22F1/10
Inventor 周扬陈琦张健蒋世川
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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