Thermal processing method improving impact resistance of 13Cr9Mo2Co1NiVNbNB forged piece

A heat treatment method and impact performance technology, applied in the field of heat treatment, can solve the problems of coarse grain size, low impact performance of forgings, instability, etc., and achieve the effect of increasing grain size, good plasticity and toughness, and improving shaping

Inactive Publication Date: 2015-11-18
WUXI PAIKE HEAVY CASTING & FORGING
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Problems solved by technology

[0002] At present, during the heat treatment process of 13Cr9Mo2Co1NiVNbNB forgings, due to the uneven structure or composition of 13Cr9Mo2Co1NiVNbNB forgings and the excessively coarse grains in 13Cr9Mo2Co1NiVNbNB forgings, in addition, 13Cr9Mo2Co1NiVNbNB forgings are affected by high temperature during forging and heating. The impact property of 13Cr9Mo2Co1NiVNbNB forging is too low and unstable

Method used

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  • Thermal processing method improving impact resistance of 13Cr9Mo2Co1NiVNbNB forged piece
  • Thermal processing method improving impact resistance of 13Cr9Mo2Co1NiVNbNB forged piece
  • Thermal processing method improving impact resistance of 13Cr9Mo2Co1NiVNbNB forged piece

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Embodiment Construction

[0022] The specific implementation manner of the present invention will be described below in conjunction with the accompanying drawings.

[0023] Implementation Li 1

[0024] Such as figure 1 As shown, a heat treatment method for improving the impact performance of 13Cr9Mo2Co1NiVNbNB forgings comprises the following steps:

[0025] The first step: inspect the raw material composition and surface quality, the raw material composition table is shown in the following table:

[0026]

[0027] The above-mentioned materials are 13Cr9Mo2Co1NiVNbNB new materials for ultra-supercritical steam turbines. The new materials are electroslag ingots. The liquid feeding conditions of electroslag ingots are good, and the shrinkage cavity and porosity of the obtained ingots are small. The content of gas and inclusions improves the shaping of the material.

[0028] The second step: forging stage: the raw material is heated and forged to form a forging. The forging process includes steps su...

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Abstract

The invention relates to a thermal processing method improving impact resistance of a 13Cr9Mo2Co1NiVNbNB forged piece. It is guaranteed that carbonitride and elements are in sufficient solid solution through high-temperature normalizing, the elements are evenly diffused, and the evenness of the tissue of the forged piece is greatly improved. In the quenching process, a water-dissolving medium or oil is adopted, and the forged piece is effectively prevented from being cooled rapidly during quenching. After the forged piece is quenched and the medium is cooled to 250-350 DEG C, the medium is discharged for air cooling, and a martensite transformation zone is prevented from being cooled rapidly; then, air cooling is carried out on the forged piece to reach the room temperature, the tissue of the forged piece is sufficiently converted, the retained austenite of the forged piece is reduced, and the uniform austenite tissue is obtained. The first-time tempering is carried out on the forged piece to eliminate the tissue and thermal stress produced through quenching, and fine carbonitride is precipitated. During second-time tempering, the stress produced during first-time tempering can be eliminated, and the martensite newly generated through the first-time tempering is tempered. The moulding of the forged piece is improved. The carbonitride can be sufficiently precipitated, and the performance of a base body is improved.

Description

technical field [0001] The invention relates to the field of heat treatment, in particular to a heat treatment method for improving the impact performance of a 13Cr9Mo2Co1NiVNbNB forging. Background technique [0002] At present, during the heat treatment process of 13Cr9Mo2Co1NiVNbNB forgings, due to the uneven structure or composition of 13Cr9Mo2Co1NiVNbNB forgings and the excessively coarse grains in 13Cr9Mo2Co1NiVNbNB forgings, in addition, 13Cr9Mo2Co1NiVNbNB forgings are affected by high temperature during forging and heating. The impact performance of 13Cr9Mo2Co1NiVNbNB forgings is too low and unstable. Contents of the invention [0003] In view of the above existing problems, the applicant has carried out research and improvement, and provides a heat treatment method for improving the impact performance of 13Cr9Mo2Co1NiVNbNB forgings. By using the method of the present invention, the room temperature impact performance of 13Cr9Mo2Co1NiVNbNB forgings can be stabilize...

Claims

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Application Information

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IPC IPC(8): C21D1/28C21D1/25C21D8/00
Inventor 许亮刘其源王骏刘智
Owner WUXI PAIKE HEAVY CASTING & FORGING
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