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A Precise Heat Treatment Method for Nickel-Based Deformed Superalloy Parts

A technology for deforming superalloys and heat treatment methods, which is applied in the direction of material thermal development, material thermal analysis, instruments, etc. The same problems, to achieve excellent room temperature mechanical properties and high temperature durability, excellent comprehensive performance, good consistency of batches

Active Publication Date: 2020-09-22
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the heat treatment process of this solid solution + aging mode is used to heat treat nickel-based deformed superalloys, the limitations and problems of this heat treatment are often exposed: the heat treatment process of this mode does not take into account the solution temperature. The correspondence of the specific chemical composition of the alloy, because the chemical composition of each batch of alloy actually smelted is different
However, the solid solution temperature used in industrial production is often fixed, which is not conducive to the precise control of the grain structure and γ′ phase structure of the alloy.
In addition, this mode of heat treatment cannot eliminate or reduce the inhomogeneity of the grain structure of complex alloyed nickel-based superalloys after forging.

Method used

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  • A Precise Heat Treatment Method for Nickel-Based Deformed Superalloy Parts
  • A Precise Heat Treatment Method for Nickel-Based Deformed Superalloy Parts
  • A Precise Heat Treatment Method for Nickel-Based Deformed Superalloy Parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In the precise heat treatment method of this nickel-based deformed superalloy, the chemical composition and weight percentage of the nickel-based deformed superalloy material are: Cr: 13.02%; Co: 15.50%; Mo: 4.12%; W: 3.87%; Al : 3.56%; Ti: 2.61%; Nb: 2.73%; C: 0.045%; the balance is Ni and unavoidable impurities. Melting and forging the above-mentioned nickel-based deformed superalloy to make rods, the melting and billeting process of the above-mentioned nickel-based deformed superalloy are as follows:

[0031] Vacuum induction furnace smelting: Put the prepared raw materials into the vacuum induction furnace for smelting, control the smelting vacuum degree to 0.1Pa, control the refining temperature of the alloy melt to 1560°C during the smelting process; tap the steel at the end of smelting, control the tapping and pouring temperature to 1460°C ; Pouring the alloy melt into a consumable electrode rod;

[0032] Vacuum consumable remelting: put the alloy electrode smel...

Embodiment 2

[0044] In the precise heat treatment method of this nickel-based deformed superalloy, the chemical composition and weight percentage of the nickel-based deformed superalloy material are: Cr: 10.52%; Co: 14.81%; Mo: 5.53%; W: 4.06%; Al : 3.15%; Ti: 3.08%; Nb: 3.19%; C: 0.056%; the balance is Ni and unavoidable impurities. Smelting and forging the above-mentioned nickel-based deformed superalloy to make rods, the process of smelting and blanking is the same as in Example 1;

[0045] Adopt the thermal treatment process of the inventive method to be:

[0046] Step 1. Cut a sample block on the nickel-based deformed superalloy, and use the differential thermal analysis method to measure the complete dissolution temperature T of the γ' phase γ′ is 1151°C;

[0047] Step 2. According to the complete dissolution temperature T of the γ' phase γ′ To 1151 ℃, multi-stage composite heat treatment is performed on nickel-based deformed superalloy parts. The steps of this composite heat trea...

Embodiment 3

[0055] In the precise heat treatment method of this nickel-based deformed superalloy, the chemical composition and weight percentage of the nickel-based deformed superalloy material are: Cr: 14.16%; Co: 16.80%; Mo: 5.08%; W: 4.87%; Al : 4.11%; Ti: 3.46%; Nb: 3.40%; C: 0.060%; the balance is Ni and unavoidable impurities. Smelting and forging the above-mentioned nickel-based deformed superalloy to make rods, the process of smelting and blanking is the same as in Example 1;

[0056] Adopt the thermal treatment process of the inventive method to be:

[0057] Step 1. Cut a sample block on the nickel-based deformed superalloy, and use the differential thermal analysis method to measure the complete dissolution temperature T of the γ' phase γ′ is 1173°C;

[0058] Step 2. According to the complete dissolution temperature T of the γ' phase γ′ To 1173 ℃, multi-stage composite heat treatment is performed on nickel-based deformed superalloy parts. The steps of this composite heat trea...

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Abstract

The invention discloses a precise heat treatment method of a nickel-based deforming high-temperature alloy workpiece. According to the technical scheme, the nickel-based deforming high-temperature alloy workpiece of each melt is sampled, testing is carried out, and complete dissolution temperature Tgamma' of a real gamma' phase is obtained. A multistage composite heat treatment system is adopted,before solid solution treatment, according to the tested Tgamm', corresponding pretreatment is adopted, the nickel-based deforming high-temperature alloy workpiece obtains a grain structure with gooduniformity, and the forging grain structure with uneven alloy can be removed. The nickel-based deforming high-temperature alloy workpiece obtained after treatment has the excellent comprehensive property, particularly, the excellent room temperature mechanical property and high-temperature durable property can be achieved, the mechanical property batch consistency is good, due to considering of actual batch gamma' phase complete dissolving temperature, compared with a traditional heat treatment system, the alloy room temperature tensile yield strength is improved by about 8% on average, the tensile strength is improved by about 5% on average, and the high-temperature durable service life is prolonged by above 20h.

Description

technical field [0001] The invention relates to a precise heat treatment method for nickel-based deformed superalloy parts, belonging to the technical field of superalloy heat treatment. Background technique [0002] Superalloys are widely used in aviation, aerospace, shipbuilding, nuclear power, petroleum, chemical and other industrial fields. According to the matrix, superalloys mainly include nickel-based superalloys, iron-based superalloys and cobalt-based superalloys; according to the forming process, they can generally be divided into two categories: deformed superalloys and cast superalloys. At present, the most widely used in aerospace and other fields is a kind of γ′ phase-Ni 3 (Al,Ti) nickel-based wrought superalloys as the main strengthening phase. This kind of nickel-based deformed superalloy has high strength, high plasticity, high fracture toughness and good fatigue performance at room temperature and high temperature. These excellent comprehensive mechanica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/10G01N25/48G01N1/04
CPCC22F1/10G01N1/04G01N25/4846
Inventor 贾崇林韦康张勇
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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