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A Method for Improving Hot Workability of Nickel-based Precipitation Strengthened Superalloy with High γ′ Phase Volume Fraction

A volume fraction, precipitation strengthening technology, applied in the field of material processing, can solve the problems of deterioration of thermal processing performance, increase of material flow stress, decrease of plasticity, etc., and achieve the effect of improving thermal processing performance, reducing flow stress and improving plasticity

Active Publication Date: 2020-11-03
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, a higher γ′ phase content not only improves the performance of the materials, but also deteriorates their thermal processing properties: during hot deformation, a higher γ′ phase content will lead to an increase in the flow stress of the material and a decrease in plasticity

Method used

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  • A Method for Improving Hot Workability of Nickel-based Precipitation Strengthened Superalloy with High γ′ Phase Volume Fraction
  • A Method for Improving Hot Workability of Nickel-based Precipitation Strengthened Superalloy with High γ′ Phase Volume Fraction
  • A Method for Improving Hot Workability of Nickel-based Precipitation Strengthened Superalloy with High γ′ Phase Volume Fraction

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Effect test

Embodiment 1

[0073] GH4065 alloy is a high-alloyed nickel-based precipitation-strengthened alloy with a γ′ phase volume fraction exceeding 35%. The high γ′ phase volume fraction makes it difficult to deform GH4065, and the application of traditional thermal deformation process will lead to cracks and scrap. The specific steps for improving the hot working plasticity of this alloy are as follows for application of the present invention:

[0074] (1) Apply vacuum induction + electroslag remelting + vacuum self-consumption triple melting casting process to prepare remelted ingots of Ф508mm, homogenize the surface lathe after heat treatment, and obtain bars with a specification of Ф490×1100mm, and return this specification to the furnace every time for heat preservation The time is 6h;

[0075] (2) After thermodynamic calculation and microstructure observation, it is measured that the volume fraction of the γ′ phase of the GH4065 alloy is 42%, and the complete melting temperature of the γ′ ph...

Embodiment 2

[0084] GH4720Li alloy is a high-alloyed nickel-based precipitation-strengthened alloy with a γ′ phase volume fraction exceeding 35%. The high γ′ phase volume fraction makes GH4720Li difficult to deform, and the application of traditional thermal deformation process will lead to cracks and scrap. The specific steps for improving the hot working plasticity of this alloy are as follows for application of the present invention:

[0085] (1) Vacuum induction + electroslag remelting + vacuum self-consumption triple casting process is used to prepare consumable ingots of Ф508 mm, and the surface is polished after homogenization of heat treatment to obtain rods with a specification of Ф490 × 1100 mm. This specification is returned to the furnace for heat preservation every time The time is 6h;

[0086] (2) After thermodynamic calculation and microstructure observation, it is measured that the volume fraction of the γ′ phase of the GH4720Li alloy is 46%, and the complete melting tempe...

Embodiment 3

[0094] GH4175 alloy is a high-alloyed nickel-based precipitation-strengthened alloy with a γ′ phase volume fraction exceeding 35%. The high γ′ phase volume fraction makes it difficult to deform GH4175, and the application of traditional thermal deformation process will lead to cracks and scrap. The specific steps for improving the hot working plasticity of this alloy are as follows for application of the present invention:

[0095](1) Prepare a Ф410mm remelted ingot by applying the vacuum induction + vacuum self-consumption double casting process, homogenize the surface finish after heat treatment, and obtain a Ф390×1000mm bar.

[0096] (2) After thermodynamic calculation and microstructure observation, it is measured that the volume fraction of the γ′ phase of the GH4175 alloy is 60%, and the complete melting temperature of the γ′ phase is about 1185°C;

[0097] (3) Heat up the Ф390×1000mm bar to T s -40°C is 1145°C, heat preservation for 6 hours for the first heat treatmen...

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Abstract

The invention relates to the field of material processing, in particular to a method of improving the hot workability of a high-gamma' phase volume fraction nickel-based precipitation strengthening high temperature alloy. The method comprises the following steps of: melting a high-gamma' phase volume fraction nickel-based precipitation strengthening high temperature alloy to obtain a remolten ingot; performing first heat treatment on the remolten ingot, and performing annealing treatment after performing first upsetting and drawing-down to obtain a first bar; carrying out second heat treatmenton the first bar, and obtaining a second bar after performing second upsetting and drawing-down; carrying out third heat treatment on the second bar, and obtaining a third bar after performing thirdupsetting and drawing-down; carrying out fourth heat treatment on the third bar, and obtaining a fourth bar after performing fourth upsetting and drawing-down; and carrying out fifth heat treatment onthe fourth bar, and obtaining a bar with the improved hot workability after performing fifth drawing-down. The method can effectively reduce the flow stress of the material during hot working, and improves the thermoplasticity of the material, thereby improving the hot workability of the material.

Description

technical field [0001] The invention relates to the technical field of material processing, in particular to a method for improving the thermal processing performance of a nickel-based precipitation-strengthened superalloy with a high γ' phase volume fraction. Background technique [0002] With the generational renewal of aero-engines, materials used in aero-engines are required to have better mechanical properties at higher temperatures. In order to meet this requirement, the development of nickel-based precipitation-strengthened superalloys, which occupy an important position in aero-engine materials, shows a trend of high alloying: by increasing the content of γ′ phase-forming elements, a higher proportion of γ′ phase precipitation is obtained. s material. Such as AD730 developed in Europe, U4720 developed in the United States, ВЖ175 developed in Russia, and GH4065, GH4175 and GH4975 developed in China and other new nickel-based deformed superalloy materials have a γ′ ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/10
CPCC22F1/10
Inventor 张北江张文云黄烁田强
Owner CENT IRON & STEEL RES INST
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