Method for refining grain structure of GH4169 alloy forging by adopting two-stage stepped strain rate process

A technology of GH4169 and strain rate, which is applied in the field of forging, can solve problems such as large deformation and achieve the effect of grain refinement

Inactive Publication Date: 2016-10-26
CENT SOUTH UNIV
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for refining the grain structure of GH4169 alloy forgings by adopting a two-stage step strain rate process, which can effectively refine the grain

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  • Method for refining grain structure of GH4169 alloy forging by adopting two-stage stepped strain rate process
  • Method for refining grain structure of GH4169 alloy forging by adopting two-stage stepped strain rate process
  • Method for refining grain structure of GH4169 alloy forging by adopting two-stage stepped strain rate process

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[0022] Example 1

[0023] Step 1: The GH4169 alloy forging blank is pretreated. The pretreatment process is: heating the forging blank to 900°C for 24 hours, and then quenching. The structure of GH4169 alloy forging blank after pretreatment in step 1 is as follows figure 1 As shown in (b), after 24 hours of pretreatment, a large amount of δ phases precipitated inside the crystal grains.

[0024] Step 2: Heat the pre-treated GH4169 alloy forging billet to a deformation temperature of 980°C, and after holding it until the billet temperature is uniform, use a two-stage stepped strain rate process to deform the billet: the strain rate of the forging billet in the first stage is 0.1 s -1 , The deformation of the forging blank in the first stage is 30% (true strain 0.35); the strain rate of the forging blank in the second stage is 0.001s -1 ; The total deformation of the forging blank after two-stage deformation is 60% (true strain 0.92). The relationship between strain rate and strain ...

Example Embodiment

[0027] Example 2

[0028] Step 1: The GH4169 alloy forging blank is pretreated. The pretreatment process is: heating the forging blank to 900°C for 24 hours, and then quenching. The structure of GH4169 alloy forging blank after pretreatment in step 1 is as follows figure 1 As shown in (b), after 24 hours of pretreatment, a large amount of δ phases precipitated inside the crystal grains.

[0029] Step 2: Heat the pretreated GH4169 alloy forging billet to a deformation temperature of 980°C, and holding it until the forging billet temperature is uniform, apply a two-stage step strain rate process to the billet: the strain rate of the forging billet in the first stage is 0.01 s -1 , The deformation of the forging blank in the first stage is 20% (true strain 0.22); the strain rate of the forging blank in the second stage is 0.001s -1 , The total deformation of the forging blank after two-stage deformation is 50% (true strain 0.7); the relationship between the strain rate and the strain ...

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Abstract

The invention discloses a method for refining a grain structure of a GH4169 alloy forging by adopting a two-stage stepped strain rate process. The method comprises the following steps: (1) pretreating a solid-solution-state alloy forging, wherein the forging is heated to 900-940 DEG C, and quenching is performed after 20-25 hours' heat preservation; (2) heating the pretreated forging to reach deformation temperature of 970-1,010 DCG C, performing heat preservation till the temperature of the heated forging becomes uniform, and then performing deformation treatment on a blank by adopting the two-stage stepped strain rate process, wherein the first-stage strain rate is 0.01-0.1 s<-1>, the deformation is 20-35%, the second-stage strain rate is 0.005-0.001 s<-1>, and the total deformation in the two stages is 50-70%; and (3) performing quenching. By adoption of the method disclosed by the invention, the purpose of refining the grain structure of a GH4169 alloy under the premise of relatively small deformation can be fulfilled, and a new technique is provided for improvement in the forging quality.

Description

Technical field: [0001] The invention belongs to the technical field of forging, and relates to a method for refining the grain structure of a GH4169 alloy forging by adopting a two-stage stepped strain rate process. Background technique: [0002] GH4169 alloy is a γ” phase (Ni 3 Nb) and γ' phase (Ni 3 AlTi) is a nickel-based superalloy with a strengthening phase, which has good comprehensive properties in the temperature range of -253 to 700°C, especially high strength, good fatigue resistance, creep resistance, and oxidation resistance below 650°C , Corrosion resistance. Therefore, GH4169 alloy is widely used in the manufacture of aviation and aerospace parts with complex shapes and particularly high performance requirements. [0003] An important goal of producing GH4169 alloy forgings by forging and other hot deformation processes is to refine their initial coarse grain structure. During hot deformation such as forging, the dynamic recrystallization mechanism is the ...

Claims

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Application Information

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IPC IPC(8): C22F1/10
CPCC22F1/10
Inventor 陈明松蔺永诚李阔阔
Owner CENT SOUTH UNIV
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