Method for thinning nickel base alloy forge piece crystalline grains and improving microstructure uniformity

A nickel-based alloy with uniform structure technology, applied in the field of forging, can solve the problems of difficult implementation, high energy consumption, high cost, etc., and achieve the effect of fine and uniform structure of forgings

Inactive Publication Date: 2019-03-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can effectively refine the grains of nickel-based alloy forgings and improve the uniformity of the structur

Method used

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  • Method for thinning nickel base alloy forge piece crystalline grains and improving microstructure uniformity
  • Method for thinning nickel base alloy forge piece crystalline grains and improving microstructure uniformity
  • Method for thinning nickel base alloy forge piece crystalline grains and improving microstructure uniformity

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Step 1: Perform solid solution and aging treatment on the nickel-based alloy forging billet. The solution temperature is 1040°C, the solution time is 45 minutes, the aging temperature is 900°C, and the aging time is 24 hours. At this time, the δ phase volume fraction of the nickel-based alloy forging billet is 12.5%;

[0026] Step 2: Perform upsetting and thermal deformation on the nickel-based alloy forging billet after solution aging treatment. The process parameters of thermal deformation are: deformation temperature 950°C, equivalent strain at the minimum deformation of the forging 0.38, and minimum equivalent strain rate 0.05s -1 , quench the forging immediately after hot deformation;

[0027] Step 3: Perform the first annealing heat treatment on the forging, the annealing heat treatment process is: annealing temperature 900°C, holding time 12 hours, at this time the δ phase volume fraction of the nickel-based alloy forging is 12%;

[0028] Step 4: Carry out the s...

Embodiment 2

[0032] Step 1: Perform solid solution and aging treatment on the nickel-based alloy forging billet. The solution temperature is 1040°C, the solution time is 45 minutes, the aging temperature is 900°C, and the aging time is 24 hours. At this time, the δ phase volume fraction of the nickel-based alloy forging billet is 12.5%;

[0033] Step 2: Perform upsetting and thermal deformation on the nickel-based alloy forging billet after solution aging treatment. The process parameters of thermal deformation are: deformation temperature 950°C, equivalent strain at the minimum deformation of the forging 0.38, and minimum equivalent strain rate 0.05s -1 , quench the forging immediately after hot deformation;

[0034] Step 3: Perform the first annealing heat treatment on the forging, the annealing heat treatment process is: annealing temperature 900°C, holding time 9 hours, at this time the δ phase volume fraction of the nickel-based alloy forging is 8.3%;

[0035] Step 4: Carry out the s...

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Abstract

The invention discloses a method for thinning nickel base alloy forge piece crystalline grains and improving microstructure uniformity. The method comprises the following steps that firstly, a nickelbase alloy forging stock with the delta phase volume fraction being 12%-16% is prefabricated; secondly, thermal deformation is carried out on the prefabricated nickel base alloy forging stock, and itis ensured that the equivalent strain of smallest deformation position of a forge piece is not smaller than 0.38, the equivalent strain rate is not smaller than 0.05 s<-1> and the deformation temperature is within 950 DEG C-1,010 DEG C; thirdly, the delta phase volume fraction of the nickel base alloy forge piece subjected to thermal deformation is adjusted to ensure that the delta phase volume fraction is 7%-12%; and fourthly, annealing heat treatment is carried out on the forge piece, and according to an annealing heat treatment process, the annealing temperature is 970 DEG C-990 DEG C, andthe heat preservation time is 50 minutes-70 minutes. According to the method, the nickel base alloy forge piece crystalline grains can be thinned, the microstructure uniformity can be improved, and aneffective approach is provided for manufacturing the high-quality forge piece.

Description

Technical field: [0001] The invention belongs to the technical field of forging, and relates to a method for refining the crystal grains of a nickel-based alloy forging and improving the uniformity of the structure. Background technique: [0002] Nickel-based alloy is a γ" phase (Ni 3 Nb) is the main strengthening phase, and the γ' phase (Ni 3 AlTi) is a nickel-based superalloy with an auxiliary strengthening phase. Because of its good comprehensive performance in the temperature range of -253°C to 700°C, especially at 650°C, it has high strength, high temperature resistance, corrosion resistance, oxidation resistance, and good creep and fatigue resistance, and is widely used For the manufacture of high-quality aero-engine components. Usually, nickel-based alloy parts are subjected to high temperature and alternating load conditions for a long time. In order to ensure their reliability, durability and safety in harsh service conditions, the final grain size of nickel-base...

Claims

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Application Information

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IPC IPC(8): C22F1/10
CPCC22F1/10
Inventor 陈明松邹宗怀蔺永诚
Owner CENT SOUTH UNIV
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