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Heat treatment method for reducing block-shaped Nb in Inconel783 alloy

A heat treatment method and alloy technology, which is applied in the field of alloy heat treatment, can solve problems such as hidden dangers in safe operation of equipment, reduction in bolt performance and service life, and damage to organizational continuity, so as to improve slip resistance and reduce the probability of inclusion formation , The effect of improving the uniformity of the tissue

Active Publication Date: 2019-09-20
大唐锅炉压力容器检验中心有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, it was also found that a large number of banded structures run through one or even several grains, destroying the continuity of the structure, easily reducing the performance and service life of the bolts, and posing a safety hazard to the safe operation of the equipment

Method used

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  • Heat treatment method for reducing block-shaped Nb in Inconel783 alloy
  • Heat treatment method for reducing block-shaped Nb in Inconel783 alloy
  • Heat treatment method for reducing block-shaped Nb in Inconel783 alloy

Examples

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Effect test

Embodiment 1

[0044] A heat treatment method for reducing bulk Nb in Inconel783 alloy

[0045] (1) Solution treatment: heat the sample in a KSL-1400X box-type resistance furnace, raise the temperature to 1150°C at a heating rate of 5°C / min, keep it warm for 60min, and cool it to room temperature with soft water; using soft water will not damage the material Corrosion and scaling inside;

[0046] (2) β aging treatment: heat the sample after solid solution treatment to 840°C at a heating rate of 5°C / min, and keep it warm for 4h;

[0047] (3) γ' aging treatment: heat and cool the sample after β aging treatment to 720°C, keep it for 8 hours, cool it in a furnace at 8°C / min to 630°C, keep it for 8 hours, and then air cool to room temperature.

Embodiment 2

[0049] A heat treatment method for reducing bulk Nb in Inconel783 alloy

[0050] (1) Solution treatment: heat the sample in a KSL-1400X box-type resistance furnace, raise the temperature to 1150°C at a heating rate of 5°C / min, keep it warm for 60min, and cool it to room temperature with soft water;

[0051] (2) β aging treatment: heat the sample after solid solution treatment to 840°C at a heating rate of 5°C / min, and keep it warm for 6h;

[0052] (3) γ' aging treatment: heat and cool the sample after β aging treatment to 720°C, keep it for 8 hours, cool it in a furnace at 8°C / min to 630°C, keep it for 8 hours, and then air cool to room temperature.

Embodiment 3

[0054] A heat treatment method for reducing bulk Nb in Inconel783 alloy

[0055] (1) Solution treatment: heat the sample in a KSL-1400X box-type resistance furnace, raise the temperature to 1140°C at a heating rate of 5°C / min, keep it warm for 50min, and cool it to room temperature with soft water;

[0056] (2) β aging treatment: heat the sample after solid solution treatment to 830°C at a heating rate of 5°C / min, and keep it warm for 6h;

[0057] (3) γ' aging treatment: heat up and cool the β-aging sample to 710°C, keep it for 6h, cool it in a furnace at 5°C / min to 620°C, keep it for 6h, and then air cool to room temperature.

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Abstract

The invention discloses a heat treatment method for reducing block-shaped Nb in Inconel783 alloy and relates to the technical field of alloy heat treatment. The heat treatment method for reducing the block-shaped Nb in the Inconel783 alloy is put forward based on the problem that the block-shaped Nb is precipitated from the inside to affect the material use safety in the use process of the Inconel783 alloy. The heat treatment method comprises the following steps of (1), solid solution treatment; (2), beta aging treatment; and (3), gamma' aging treatment. The heat treatment method for reducing the block-shaped Nb in the Inconel783 alloy has the beneficial effects that the Nb in materials can be refined, the size of the block-shaped Nb is reduced, in subsequent aging, NbC of tiny size is precipitated out, fine and uniform carbide can improve the anti-slip ability of grain boundary significantly, and the probability of formation of harmful inclusions inside the materials is reduced.

Description

technical field [0001] The invention relates to the technical field of alloy heat treatment, in particular to a heat treatment method for bulk Nb in Inconel783 alloy. Background technique [0002] Large-scale units such as supercritical and super (ultra)critical have gradually become an effective measure to improve the technology of thermal power units because of their advantages such as low coal consumption and less pollution emissions. Inconel783 alloy is a newly developed LTE superalloy based on Fe-Ni-Co, which is an austenitic alloy. The main reinforcing phase is Ni 3 Al-type γ' phase, and Nb is one of the main elements forming γ' phase. Compared with other LTE superalloys, its aluminum content is more than 5%, and it is easy to precipitate β-NiAl phase along the grain boundary, which can significantly improve the high-temperature durable life of the alloy and the stress-accelerated grain boundary oxidation (SAGBO) resistance. This three-phase (γ-β-γ') oxidation-resist...

Claims

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Application Information

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IPC IPC(8): C22F1/10
CPCC22F1/10
Inventor 刘俊建赵强王家庆吴跃杜晓东陈安生倪满生王严
Owner 大唐锅炉压力容器检验中心有限公司
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