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A heat treatment method for eliminating the laves phase in the β phase in superalloy inconel783 bolts

A heat treatment method and high-temperature alloy technology, which is applied in the field of alloy heat treatment, can solve problems such as the decrease of plasticity and toughness, destroy the original structure of β phase, and affect the safety of bolts, and achieve the effect of restoring strength, plasticity and toughness, and refining size

Active Publication Date: 2022-02-11
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the problem that the Laves phase exists in the β phase during the use of the current inconel783 bolts, which destroys the original structure of the β phase, causes a decrease in plasticity and toughness, and affects the use safety of the bolts. Heat treatment method of laves phase in β phase

Method used

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  • A heat treatment method for eliminating the laves phase in the β phase in superalloy inconel783 bolts
  • A heat treatment method for eliminating the laves phase in the β phase in superalloy inconel783 bolts
  • A heat treatment method for eliminating the laves phase in the β phase in superalloy inconel783 bolts

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Embodiment 1

[0023] In this embodiment, the heat treatment method for eliminating the laves phase in the β phase in the superalloy inconel783 bolt is as follows:

[0024] 1. Solution treatment: Select the inconel783 superalloy bolt with Laves phase after the main valve of the 660MW supercritical unit is in service, cut the sample from the inconel783 superalloy bolt axially, and put the sample into the KSL-1400X box-type resistance furnace Heat up to 1100°C at a heating rate of 5°C / min, hold for 1 hour, and air cool to room temperature;

[0025] 2. β aging treatment: put the sample after solid solution treatment into KSL-1400X box-type resistance furnace, heat up to 840°C at a heating rate of 5°C / min, keep it warm for 6 hours, and air cool to room temperature;

[0026] 3. γ' aging treatment: put the sample after β aging treatment into the KSL-1400X box-type resistance furnace, the heating rate is 5 ℃ / min, the temperature is raised to 720 ℃, kept for 8 hours, and cooled to 630 ℃ with the fur...

Embodiment 2

[0028] In this embodiment, the heat treatment method for eliminating the laves phase in the β phase in the superalloy inconel783 bolt is as follows:

[0029] 1. Solution treatment: Select the inconel783 superalloy bolt with Laves phase after the main valve of the 660MW supercritical unit is in service, cut the sample from the inconel783 superalloy bolt axially, and put the sample into the KSL-1400X box-type resistance furnace Heat up to 1110°C at a heating rate of 5°C / min, hold for 1 hour, and air cool to room temperature;

[0030] 2. β aging treatment: put the sample after solid solution treatment into KSL-1400X box-type resistance furnace, heat up to 840°C at a heating rate of 5°C / min, keep it warm for 6 hours, and air cool to room temperature;

[0031] 3. γ' aging treatment: put the sample after β aging treatment into the KSL-1400X box-type resistance furnace, the heating rate is 5 ℃ / min, the temperature is raised to 720 ℃, kept for 8 hours, and cooled to 630 ℃ with the fur...

Embodiment 3

[0033] In this embodiment, the heat treatment method for eliminating the laves phase in the β phase in the superalloy inconel783 bolt is as follows:

[0034] 1. Solution treatment: Select the inconel783 superalloy bolt with Laves phase after the main valve of the 660MW supercritical unit is in service, cut the sample from the inconel783 superalloy bolt axially, and put the sample into the KSL-1400X box-type resistance furnace Heat up to 1120°C at a heating rate of 5°C / min, hold for 1 hour, and air cool to room temperature;

[0035] 2. β aging treatment: put the sample after solid solution treatment into KSL-1400X box-type resistance furnace, heat up to 840°C at a heating rate of 5°C / min, keep it warm for 6 hours, and air cool to room temperature;

[0036] 3. γ' aging treatment: put the sample after β aging treatment into the KSL-1400X box-type resistance furnace, the heating rate is 5 ℃ / min, the temperature is raised to 720 ℃, kept for 8 hours, and cooled to 630 ℃ with the fur...

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Abstract

The invention discloses a heat treatment method for eliminating the laves phase in the beta phase in superalloy inconel783 bolts. The inconel783 bolt sample with the laves phase in the beta phase is sequentially subjected to solid solution treatment, beta aging treatment and gamma' aging treatment. Through the heat treatment method of the present invention, the Nb in the laves phase can be solid-dissolved into the austenite matrix, the Laves phase in the β phase can be refined, a large number of needle-shaped Laves phases can be transformed into fine rod-shaped Laves phases, and even the Laves phase can be made Complete elimination restores the plasticity and toughness of the material; through the heat treatment method of the present invention, the size of the β phase can be refined, and the strength and plasticity of the material can be restored.

Description

technical field [0001] The invention belongs to the technical field of alloy heat treatment, and in particular relates to a heat treatment method for eliminating the laves phase in the β phase in the high-temperature alloy inconel783 bolt. Background technique [0002] In order to meet the requirements of the development of the times, the power industry has continuously increased the requirements for energy saving and emission reduction, and the thermal power generating units with conventional parameters are accelerating the transformation to supercritical generating units with high parameters. Inconel783, a low-expansion superalloy introduced from the aerospace field, is widely used in supercritical units. Inconel783 is a low expansion coefficient superalloy based on Fe-Ni-Co. Because its Al content (≥5%) is much higher than other traditional low expansion coefficient superalloys, it can not only precipitate and disperse on the γ-austenite matrix The γ' phase of the alloy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/00
CPCC22F1/00
Inventor 杜晓东陶思友巫振伟刘润飞王赛龙
Owner HEFEI UNIV OF TECH
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