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A Heat Treatment Process for Eliminating Ribbon Structure of R26 Superalloy Bolts

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

Active Publication Date: 2020-08-07
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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  • A Heat Treatment Process for Eliminating Ribbon Structure of R26 Superalloy Bolts
  • A Heat Treatment Process for Eliminating Ribbon Structure of R26 Superalloy Bolts
  • A Heat Treatment Process for Eliminating Ribbon Structure of R26 Superalloy Bolts

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Effect test

Embodiment 1

[0026] A kind of heat treatment process that the present invention proposes to eliminate R26 superalloy bolt band structure comprises the following steps:

[0027] S1. Solution treatment: Select the R26 superalloy bolt with banded structure after the main valve of the 600MW supercritical unit has been in service, cut the bolt axially from the R26 superalloy bolt as a sample, and put the sample into the KSL-1100X box-type resistor Heating in the furnace with a heating rate of 5°C / min, increasing the temperature with the furnace to 1030°C, keeping the temperature 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 sample after solid solution treatment into a KSL-1100X box-type resistance furnace at a heating rate of 5°C / min, raise the temperature to 815°C, and keep it warm for 6 hours;

[0029] S3. Aging treatment: furnace cool the sample after intermediate treatment to 730°C at a cooli...

Embodiment 2

[0031] A kind of heat treatment process that the present invention proposes to eliminate R26 superalloy bolt band structure comprises the following steps:

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

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

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

Embodiment 3

[0036] A kind of heat treatment process that the present invention proposes to eliminate R26 superalloy bolt band structure comprises the following steps:

[0037] S1. Solution treatment: heat the R26 superalloy bolt with banded structure to 1050°C at a heating rate of 4°C / min, keep it warm for 10min, and cool it to room temperature with oil;

[0038] S2. Intermediate treatment: raise the temperature of the sample after solid solution treatment to 800°C at a heating rate of 1°C / min, and keep it warm for 7h;

[0039] S3. Aging treatment: furnace cool the sample after intermediate treatment to 750° C. at a cooling rate of 8° C. / min, keep it warm for 3 hours, and air cool 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 banded structure of R26 superalloy bolts. Background technique [0002] In recent years, with the gradual increase in energy saving and emission reduction requirements, thermal power plants are developing towards large capacity and high parameters. Super (super) critical units above 600MW have gradually become the The mainstream unit in my country's power industry. Refractaloy26 alloy (referred to as R26 alloy, also known as R26 superalloy), belongs to Ni-Cr-Co-Fe series precipitation hardening superalloy, melting point is 1360 ° C, because the alloy contains high content of Ni, Co, Cr, Mo alloy elements , so it has excellent high temperature performance at 680°C, especially stress relaxation resistance and creep resistance. At present, bolts made of R26 superalloy are widely used for connecting main steam valves, high-pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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