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Thermal treatment process for nickel-based superalloy

A nickel-based superalloy and heat treatment furnace technology, applied in the field of nickel-based alloys, can solve the problems of deformed nickel-based superalloys with strong pertinence and unsuitable for processing cast nickel-based superalloys and nickel-based superalloys, etc. The effect of improving mechanical properties and increasing the precipitation volume fraction

Active Publication Date: 2016-03-09
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a heat treatment process for nickel-based superalloys to solve the problem that existing heat treatment processes are highly targeted to deformed nickel-based superalloys and are not suitable for processing cast nickel-based superalloys and hot isostatic pressing. The problem with nickel-based superalloys after

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Taking the whole casting of autoclave for petroleum geological exploration as an example, the heat treatment steps are as follows:

[0038] 1) Pre-homogenization treatment: put the casting into a box-type electric furnace, and perform pre-homogenization in the atmosphere at a temperature of 1095°C±10°C and a holding time of 3 hours;

[0039] 2) Homogenization treatment: The castings are continuously heated in a box-type electric furnace for homogenization treatment, the temperature is 1175°C±10°C, the holding time is 4h±0.1h, and then the furnace is turned on and air-cooled to room temperature before being released;

[0040] 3) Solution treatment: Then put the casting into a box-type electric furnace that can control the cooling rate for solution treatment. The temperature is 950°C±10°C, the holding time is 3h±0.1h, and then the cooling rate is 550°C / h Cool to 650°C, and finally open the furnace and air-cool the casting to room temperature before releasing it;

[0041] 4...

Embodiment 2

[0043] Taking the gas turbine casing as an example, the gas turbine casing requires hot isostatic pressing, and the heat treatment steps are:

[0044] 1) Hot isostatic pressing treatment: remove the oil stain on the surface of the casting, and then set the parameters of the hot isostatic pressing furnace: the temperature is 1165°C, the pressure is 140MPa, and then the casting is put into the hot isostatic pressing furnace for hot isostatic pressing treatment, When the temperature of the hot isostatic pressing furnace rises to 1165°C and the pressure reaches 140MPa, start timing, so that the casting holding time is 10h±0.1h, then cool down to 400°C with the furnace, and finally turn on the furnace and cool to room temperature before being released;

[0045] 2) Homogenization treatment: Then put the casting into a box-type electric furnace for homogenization treatment, the temperature is 1165°C±10°C, the holding time is 19h±0.1h, and then the furnace is turned on and air-cooled t...

Embodiment 3

[0049] Taking the liquid oxygen pressure vessel as an example, the liquid oxygen pressure vessel is a large complex casting, and requires hot isostatic pressing treatment at the same time. The specific heat treatment steps are:

[0050] 1) Pre-homogenization treatment: put the casting into a box-type electric furnace, and perform pre-homogenization in the atmosphere at a temperature of 1095°C±10°C and a holding time of 12 hours;

[0051] 2) Hot isostatic pressing treatment: remove the oil stain on the surface of the casting, and then set the parameters of the hot isostatic pressing furnace: the temperature is 1160°C, the pressure is 130MPa, and then the casting is put into the hot isostatic pressing furnace for hot isostatic pressing treatment. When the temperature of the hot isostatic pressing furnace rises to 1160°C and the pressure reaches 130MPa, start timing so that the casting holding time is 21h±0.1h, then cool down to 300°C with the furnace, and finally turn on the furn...

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Abstract

The invention relates to a thermal treatment process for nickel-based superalloy. The process includes the following steps that homogenizing treatment is carried out, the temperature ranges from 1160 DEG C to 1195 DEG C, the heat preservation time is 1-36 h, and then the superalloy is cooled to the room temperature; solution treatment is carried out, the temperature ranges from 935 DEG C to 995 DEG C, the heat preservation time is 0.5-15 h, the superalloy is cooled to 650 DEG C at the cooling speed of 50-650 DEG C / h, and then the superalloy is air-cooled to the room temperature; and aging treatment is carried out in two periods, according to the first period, the treatment temperature is 720+ / -10 DEG C, the heat preservation time is 8+ / -0.1 h, and then the superalloy is cooled to 620 DEG C at the cooling speed of 50-56 DEG C / h, and according to the second period, the treatment temperature is 620+ / -10 DEG C, the heat preservation time is 8 h, and then the superalloy is air-cooled to the room temperature. The aging treatment can also be carried out in two periods, according to the first period, the treatment temperature is 760+ / -10 DEG C, the heat preservation time is 5+ / -0.1 h, and then the superalloy is cooled to 650 DEG C at the cooling speed of 50-56 DEG C / h, and according to the second period, the treatment temperature is 650+ / -10 DEG C, the heat preservation time is 1+ / -0.1 h, and then the superalloy is air-cooled to the room temperature. According to the thermal treatment process, the limitation of an existing standard thermal treatment regime and the limitation of an existing modification thermal treatment regime are broken through, and the mechanical property of the nickel-based superalloy is substantially improved.

Description

technical field [0001] The invention relates to the technical field of nickel-based alloys, in particular to a heat treatment process for nickel-based superalloys. Background technique [0002] Nickel-based superalloys are widely used in aviation, ships, nuclear energy, ground gas turbines, petrochemical and other fields due to their excellent mechanical properties such as high temperature resistance, high pressure resistance, and good weldability. The research and development of high-temperature alloy large-scale castings, its consumption is also increasing. In the industry, heat treatment is usually used to change the metallographic structure of nickel-based superalloys, so as to ensure that the metallographic structure of nickel-based superalloys precipitates a strengthening phase with sufficient volume fraction and reasonable particle size - γ〃 (ie: Ni3Nd), so as to achieve the strengthening of nickel. The purpose of the mechanical properties of the base superalloy. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10
Inventor 赵京晨燕平
Owner CENT IRON & STEEL RES INST
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