Heat treatment method of 750-850 DEG C-grade wrought high-temperature alloy

A technology of deformed superalloy and heat treatment method, applied in the field of heat treatment of 750-850 ℃ deformed superalloy, can solve the problems of forging cracking, superalloy melting and hole phenomenon, reduce the mechanical strength of materials, etc., to improve mechanical properties, eliminate Element segregation phenomenon, the effect of avoiding cracking phenomenon

Active Publication Date: 2022-01-14
ANSTEEL BEIJING RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some of these alloys do not contain niobium element and its related Laves phase, so the existing technology mostly adopts one-stage solution heat treatment process to achieve uniform distribution of segregated elements. However, one-stage solution heat treatment process is likely to cause local melting and porosity of superalloys , reducing the mechanical strength of the material, resulting in subsequent forging cracks

Method used

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  • Heat treatment method of 750-850 DEG C-grade wrought high-temperature alloy
  • Heat treatment method of 750-850 DEG C-grade wrought high-temperature alloy
  • Heat treatment method of 750-850 DEG C-grade wrought high-temperature alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1 Two-stage solid solution treatment

[0045] (1) Put the cast ingot into a furnace at 500°C, keep it warm for 20 hours, and preheat;

[0046] (2) Raise the temperature to 1080°C at a rate of 50°C / h, keep it warm for 30h, and perform the first stage of solid solution treatment;

[0047] (3) Raise the temperature to 1140°C at a rate of 80°C / h, keep it warm for 55h, and carry out the second stage of solid solution treatment;

[0048] (4) Cool in the furnace to 1050°C, open the furnace door and cool to 800°C with the furnace, and cool the oil outside the furnace to room temperature.

[0049] In the ingot after heat treatment in this embodiment, the residual segregation coefficient of elements is 0.22±0.03, and there is no incipient melting and hole phenomenon; in the thermal compression test, the maximum deformation resistance is 147MPa, and the sample surface has no cracks.

[0050] The metallographic structure morphology of the ingot of the present embodimen...

Embodiment 2

[0051] Embodiment 2 Two-stage solid solution treatment

[0052] (1) Put the cast ingot into a 700°C furnace, keep it warm for 12 hours, and preheat;

[0053] (2) Raise the temperature to 900°C at a rate of 30°C / h, keep it warm for 50h, and perform the first stage of solid solution treatment;

[0054] (3) Raise the temperature to 1190°C at a rate of 120°C / h, keep it warm for 40h, and carry out the second stage of solid solution treatment;

[0055] (4) Cool the furnace to 1050°C, open the furnace door and cool to 800°C with the furnace, and cool the water outside the furnace to room temperature.

[0056] In the heat-treated ingot in this embodiment, the element residual segregation coefficient is 0.18±0.02, and there is no incipient melting and hole phenomenon; in the thermal compression test, the maximum deformation resistance is 143MPa, and the sample surface has no cracks.

Embodiment 3

[0057] Embodiment 3 Two-stage solid solution treatment

[0058] (1) Put the cast ingot into a 600°C furnace, keep it warm for 15 hours, and preheat;

[0059] (2) Raise the temperature to 1000°C at a rate of 120°C / h, keep it warm for 50h, and perform the first stage of solid solution treatment;

[0060] (3) Raise the temperature to 1160°C at a rate of 100°C / h, keep it warm for 50h, and carry out the second stage of solid solution treatment;

[0061] (4) Cool in the furnace to 1100°C, open the furnace door and cool to 850°C with the furnace, and cool to room temperature outside the furnace.

[0062] In the heat-treated ingot in this embodiment, the element residual segregation coefficient is 0.20±0.02, and there is no incipient melting and hole phenomenon; in the thermal compression test, the maximum deformation resistance is 146 MPa, and the sample surface has no cracks.

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Abstract

The invention relates to the technical field of heat treatment for high-temperature alloys, and specifically relates to a heat treatment method of a 750-850 DEG C-grade wrought high-temperature alloy. The heat treatment method comprises the following steps of cast ingot preheating, at least two-stage solution treatment and cooling treatment, wherein the treatment temperature of the solution treatment ranges from 900 DEG C to 1190 DEG C, and the temperature of each section of solution treatment is increased in sequence. According to the multi-section homogenizing heat treatment process, segregation elements can be effectively promoted to be uniformly diffused to a matrix, and local melting and hole phenomena are avoided, so that the mechanical strength of the high-temperature alloy is improved.

Description

technical field [0001] The invention relates to the technical field of heat treatment of superalloys, in particular to a heat treatment method for 750-850°C grade deformed superalloys. Background technique [0002] Superalloys, also known as heat-strength alloys, heat-resistant alloys or superalloys, can work stably for a long time in a high-temperature environment of 600-1100°C, have excellent mechanical properties and high-temperature resistance characteristics, and are widely used in the manufacture of aero-engines. Practical applications have high quality requirements for the number of precipitates and inclusions in superalloys. These precipitates and inclusions may become fatigue crack sources or crack propagation paths, seriously affecting the service safety of materials. Therefore, after the material is smelted out of the furnace, it is very important to improve the segregation problem of the alloy structure. In the prior art, a homogenization heat treatment process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/00C22F1/10
CPCC22F1/00C22F1/10
Inventor 张昭信瑞山刘斌李应焕
Owner ANSTEEL BEIJING RES INST
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