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A bolt heat treatment process of in783 alloy material

A technology of alloy bars and bolts, applied in metal material coating process, heat treatment furnace, heat treatment equipment and other directions, can solve the problems of insufficient oxidation resistance, low expansion performance, etc., to solve the problems of insufficient oxidation resistance and low high temperature strength. Effect

Active Publication Date: 2021-11-09
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides a bolt heat treatment process made of IN783 alloy. While ensuring the high-temperature strength and low expansion performance of the alloy, the aluminum content on the surface of the IN783 alloy is significantly increased, thereby solving the problem of the IN783 alloy bolt in Insufficient antioxidant performance during service

Method used

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  • A bolt heat treatment process of in783 alloy material
  • A bolt heat treatment process of in783 alloy material
  • A bolt heat treatment process of in783 alloy material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Heat treatment is carried out on bolts made of IN783 alloy. The heat treatment process steps and parameters are as follows:

[0022] (1), the IN783 alloy bar to be manufactured bolts is heated to 1120 ° C in an atmospheric environment at atmospheric pressure, kept for 1 hour, and air cooled to room temperature;

[0023] (2), the bar after step (1) heat treatment is processed into the finished product bolt of specification;

[0024] (3), put the bolts of step (2) in a vacuum of 8×10 -6 Heating to 840°C in a Pa atmosphere and keeping it warm for 3 hours, cooling to room temperature with high-purity argon gas with a purity of not less than 99.99%, and controlling the cooling rate by flow rate to not less than 10°C / min;

[0025] (4), put the bolt of step (3) in the airtight workpiece chamber, feed high-purity argon gas through the pipeline communicated with it, remove the air in the workpiece chamber;

[0026] (5) Put pure aluminum powder and ammonium chloride powder in a...

Embodiment 2

[0032] Heat treatment is carried out on bolts made of IN783 alloy. The heat treatment process steps and parameters are as follows:

[0033] (1), the IN783 alloy bar to be manufactured bolts is heated to 1130°C in an atmospheric environment at atmospheric pressure, kept for 5 hours, and air-cooled to room temperature;

[0034] (2), the bar after step (1) heat treatment is processed into the finished product bolt of specification;

[0035] (3), put the bolts of step (2) in a vacuum of 8×10 -6 Heating to 850°C in a Pa atmosphere, keeping it warm for 6 hours, cooling to room temperature with high-purity argon gas with a purity of not less than 99.99%, and controlling the cooling rate by flow rate to not less than 10°C / min;

[0036] (4), put the bolt of step (3) in the airtight workpiece chamber, feed high-purity argon gas through the pipeline communicated with it, remove the air in the workpiece chamber;

[0037] (5) Put pure aluminum powder and ammonium chloride powder in an at...

Embodiment 3

[0043] Heat treatment is carried out on bolts made of IN783 alloy. The heat treatment process steps and parameters are as follows:

[0044] (1), the IN783 alloy bar to be manufactured bolts is heated to 1124°C in a normal pressure atmosphere, kept for 2 hours, and air cooled to room temperature;

[0045] (2), the bar after step (1) heat treatment is processed into the finished product bolt of specification;

[0046] (3), put the bolts of step (2) in a vacuum of 8×10 -6 Heating to 840°C in a Pa atmosphere, and keeping it warm for 5 hours, cooling to room temperature with high-purity argon gas with a purity of not less than 99.99%, and controlling the cooling rate by flow rate to not less than 10°C / min;

[0047] (4), put the bolt of step (3) in the airtight workpiece chamber, feed high-purity argon gas through the pipeline communicated with it, remove the air in the workpiece chamber;

[0048] (5) Put pure aluminum powder and ammonium chloride powder in an atmosphere generator a...

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Abstract

The invention discloses a heat treatment process for bolts made of IN783 alloy, which comprises the steps of: keeping the IN783 alloy rods to be manufactured at 1120°C to 1130°C for 1 hour, and air cooling to room temperature; processing the above-mentioned rods to meet the specification requirements After the finished bolts, the degree of vacuum is not lower than 1×10 ‑5 Heating to 840°C-850°C in Pa atmosphere, keeping it warm for 3 hours, cooling to room temperature with high-purity argon; placing the treated bolts in AlCl n Heating to 710°C-725°C in the atmosphere, and holding it for 8 hours, cooling to 620°C-630°C with the furnace, holding it for 8 hours, and cooling to room temperature with high-purity argon. The heat treatment process of the IN783 alloy bolt described in the present invention can obtain an aluminum content with a mass ratio of 10% to 15% in the depth of 2 μm on the surface of the bolt while ensuring the high temperature strength and low expansion performance of the alloy, which is much higher than that of the alloy base material The mass ratio is 5%-6% aluminum content. Al in the Al-rich diffusion layer can form Al 2 o 3 Protective film, thereby solving the problem of insufficient oxidation resistance of IN783 alloy bolts during service.

Description

technical field [0001] The invention belongs to the field of metal heat treatment, and in particular relates to a heat treatment process for bolts made of IN783 alloy. Background technique [0002] IN783 (Inconel 783) alloy is a high-aluminum, low-chromium and low-expansion high-temperature alloy developed by the American Special Metal Materials Company. It is characterized in that while maintaining the γ′ phase strengthening, it is distributed on grain boundaries The Al-rich β phase improves the oxidation resistance of grain boundaries. In recent years, with the development of ultra-supercritical thermal power technology, this alloy has also been used as a high-temperature bolt material for ultra-supercritical steam turbines. [0003] High-temperature bolts are parts used to fasten connections that work under high-temperature and stress conditions in generator sets for a long time. Leakage plays a vital role in the normal operation of high-temperature fastening parts in p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/10C21D9/00C23C8/10
CPCC21D9/0093C22F1/10C23C8/10
Inventor 鲁金涛黄锦阳杨珍党莹樱严靖博周永莉袁勇谷月峰
Owner XIAN THERMAL POWER RES INST CO LTD