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Heating treatment process for eliminating ribbon structure of R26 high temperature alloy bolt

A technology of superalloy and banded structure, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problem of weakening the effect of solid solution strengthening and dispersion strengthening of bolts, reducing bolt performance and service life, and destroying the internal uniformity and continuity of materials, etc. problems, to achieve the effect of optimizing the heat treatment process, improving the mechanical properties, and increasing the yield strength

Active Publication Date: 2019-02-19
大唐锅炉压力容器检验中心有限公司 +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, bolts made of R26 superalloy are widely used for connecting main steam valves, high-profile valves, and steam guide pipe flanges of super (super) critical units above 600MW. However, alloy phases and carbonization in the metallographic structure of bolts are often found The particles are distributed in bands or along the austenite grain boundaries (banded structure), which weakens the effect of solid solution strengthening and dispersion strengthening of bolts. At the same time, the alloy phases are distributed in grain boundaries or in bands, which splits the matrix and destroys the The uniform continuity inside the material will easily lead to the reduction of bolt performance and service life, and pose a safety hazard to the safe operation of equipment

Method used

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  • Heating treatment process for eliminating ribbon structure of R26 high temperature alloy bolt
  • Heating treatment process for eliminating ribbon structure of R26 high temperature alloy bolt
  • Heating treatment process for eliminating ribbon structure of R26 high temperature alloy bolt

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Effect test

Embodiment 1

[0026] A heat treatment process for eliminating the ribbon structure of R26 superalloy bolts proposed by the present invention includes the following steps:

[0027] S1. Solution treatment: Select R26 superalloy bolts with banded structure after the main valve of the 600MW supercritical unit is in service, cut axially from the R26 superalloy bolts as samples, and put the samples into KSL-1100X box-type resistors Heating in a furnace with a heating rate of 5 °C / min, heating up with the furnace, heating to 1030 °C, holding for 15 minutes, then taking out the sample and placing it in engine oil to cool to room temperature;

[0028] S2. Intermediate treatment: put the solution-treated sample into the KSL-1100X box-type resistance furnace, the heating rate is 5°C / min, the temperature is raised to 815°C, and the temperature is kept for 6h;

[0029] S3. Aging treatment: The sample after intermediate treatment is furnace cooled to 730°C at a cooling rate of 10°C / min, kept for 4 hours,...

Embodiment 2

[0031] A heat treatment process for eliminating the ribbon structure of R26 superalloy bolts proposed by the present invention includes the following steps:

[0032] S1. Solution treatment: heat the sample to 980°C at a heating rate of 1°C / min, keep the temperature for 20min, and cool the oil to room temperature;

[0033] S2. Intermediate treatment: heat the solution-treated sample to 830°C at a heating rate of 4°C / min, and keep the temperature for 5h;

[0034] S3. Aging treatment: Cool the sample after intermediate treatment to 710°C at a cooling rate of 5°C / min, keep the temperature for 5h, and air-cool to room temperature.

Embodiment 3

[0036] A heat treatment process for eliminating the ribbon structure of R26 superalloy bolts proposed by the present invention includes the following steps:

[0037] S1. Solution treatment: The R26 superalloy bolt with banded structure is heated to 1050°C at a heating rate of 4°C / min, kept for 10 minutes, and the oil is cooled to room temperature;

[0038] S2. Intermediate treatment: heat the solution-treated sample to 800°C at a heating rate of 1°C / min, and keep the temperature for 7h;

[0039] S3. Aging treatment: The sample after intermediate treatment is furnace cooled to 750°C at a cooling rate of 8°C / min, kept for 3 hours, and air-cooled to room temperature.

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Abstract

The invention discloses a heat treatment process for eliminating the ribbon structure of an R26 high-temperature alloy bolt. The process comprises the following steps: S1, solution treatment: heatingsamples to 980-1050 DEG C, preserving heat for 10-20 min, and cooling the samples to room temperature by oil; S2; intermediate treatment: heating the sample after solution treatment to 800-830 DEG C and preserving heat for 5-7h; and S3, timing treatment: cooling the samples after the intermediate treated at the rate of 5-10 DEG C / min to 710-750 DEG C, preserving heat for 3-5 h, and cooling the samples to room temperature by air. The heating treatment process for eliminating the ribbon structure of the R26 high temperature alloy bolt specifically eliminates the ribbon structure of the materialand effectively improves the performance of the material and prolongs the service life of the material.

Description

technical field [0001] The invention relates to the technical field of alloy heat treatment, in particular to a heat treatment process for eliminating the ribbon structure of R26 superalloy bolts. Background technique [0002] In recent years, with the gradual improvement of energy conservation and emission reduction requirements, thermal power plants are developing in the direction of large capacity and high parameters. Ultra (super) critical units above 600MW have gradually become a Mainstream units in my country's power industry. Refractaloy26 alloy (referred to as R26 alloy, also known as R26 superalloy) is a Ni-Cr-Co-Fe precipitation hardening superalloy with a melting point of 1360 ° C, because the alloy contains a relatively high content of Ni, Co, Cr, Mo alloying elements , so it has excellent high temperature properties at 680 ° C, especially stress relaxation resistance and creep resistance. At present, bolts made of R26 superalloy are widely used in the main valv...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D1/78C21D6/00C21D9/00
CPCC21D1/18C21D1/78C21D6/004C21D6/007C21D9/0093
Inventor 吴跃赵强刘俊建杜晓东陈顺王齐宏罗畅王家庆翟亚民
Owner 大唐锅炉压力容器检验中心有限公司
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