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Method for preparing large-specification difficult-to-deform high-temperature alloy fine crystal bar

A high-temperature alloy and hard-to-deform technology, which is applied in the field of large-scale hard-to-deform high-temperature alloy bar preparation, can solve problems such as insufficient core deformation, uneven grains, and insufficient extrusion ratio, so as to achieve optimal distribution and increase overall opening. The effect of increasing billet deformation and extrusion ratio

Inactive Publication Date: 2019-11-01
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention: to propose a method for preparing large-scale and difficult-to-deform superalloy rods by using the upsetting and extrusion composite billet making process of ingot upsetting and extrusion. There are problems in the preparation of large-scale rods such as insufficient extrusion ratio and insufficient core deformation in direct extrusion, and finally obtain a uniform and fine-grained structure to meet the development needs of aero-engine turbine disks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The preparation steps of Φ280mm specification GH4720Li alloy fine-grained rod are:

[0064] A. Ingot processing

[0065] Cut the Φ508 GH4720Li ingot that has been triple smelted and homogenized by using a band saw into a cylindrical section with a height-to-diameter ratio of 2.8, a flat surface, and R10 rounded corners on the end face.

[0066] B. Ingot upsetting

[0067] B.1. Preparation before forging: Blow sand on the entire surface of the billet, brush the special glass lubricant evenly on the surface of the billet, the thickness of the glass lubricant is 0.5mm, and let it dry naturally.

[0068] B.2. Ingot heating: the ingot is put into the furnace at room temperature, and the heating system is:

[0069] 200°C×4h→400°C×4h→600°C×4h→800°C×4h→1070°C×4h.

[0070] B.3. Flat die preheating: Preheat the flat die to 350°C-400°C with a mold heating furnace.

[0071] B.4, Upsetting: Use the manipulator to transfer the ingot from the heating furnace to the flat die, and t...

Embodiment 2

[0082] The preparation steps of Φ250mm specification GH4175 alloy fine-grained rod are:

[0083] A. Ingot processing

[0084] Use a band saw to cut the GH4175 ingot of Φ508 that has been smelted and homogenized in three steps into a cylindrical material section with a height-to-diameter ratio of 2.0, a flat surface, and an R50 rounded end face.

[0085] B. Ingot upsetting

[0086] B.1. Preparation before forging: Blow sand on the entire surface of the ingot and apply special glass lubricant with a thickness of 2mm, and let it dry naturally.

[0087] B.2. Ingot heating: the ingot is put into the furnace at 300°C, and the heating system is 300°C×10h→900°C×10h→1130°C×10h.

[0088] B.3. Mold preheating: Preheat the flat mold to about 350°C with a mold furnace.

[0089] B.4, Upsetting: Use the manipulator to transfer the ingot from the heating furnace to the flat die, and the transfer time is less than 90s. Operate the forging press to upset the billet, the engineering strain i...

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Abstract

The invention discloses a method for preparing a large-specification difficult-to-deform high-temperature alloy fine crystal bar, and belongs to the technical field of high-temperature alloy hot machining. The method comprises the following steps of ingot casting machining; ingot upsetting; intermediate billet sheathing; hot extruding; and extrusion bar machining. According to the method, a billetmaking method that the cogging deformation is enabled to be increased through the upsetting and extruding and optimizing deformation distribution is provided, the method can be used for preparing thelarge-specification difficult-to-deform high-temperature alloy uniform and fine crystal rod, and meet the development requirements of a difficult-to-deform nickel-based high-temperature alloy turbinedisc forging piece.

Description

technical field [0001] The invention relates to a method for preparing a large-scale hard-to-deform high-temperature alloy fine-grained bar, which belongs to the technical field of thermal processing and relates to an improvement of a large-scale hard-to-deform high-temperature alloy bar preparation method. Background technique [0002] The hard-to-deform superalloy has become an important material for aero-engine turbine disk parts due to its excellent comprehensive mechanical properties, excellent corrosion resistance and oxidation resistance. The main process of using it to prepare turbine disks is: alloy smelting → ingot casting → forging →Heat treatment of plate blank →Machine finished product. Among them, the purpose of ingot opening by thermal deformation is to obtain fine-grained rods of a certain size, which provide shape and tissue preparation for the subsequent turbine disk forging. [0003] For the preparation of hard-to-deform high-temperature alloy ingots and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/08B21J5/00B21J1/06B21C23/22B21C37/04C22F1/00
CPCB21C23/001B21C23/002B21C23/22B21C37/04B21J1/06B21J5/002B21J5/08C22F1/008
Inventor 李凯方爽兰博东赟鹏林莺莺
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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