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A method for improving the cold forming performance of gh4090 cold-rolled strip

A cold-rolled strip and cold-forming technology is applied in the field of improving the cold-forming properties of GH4090 cold-rolled strips, which can solve problems such as long holding time, and achieve the effects of small degree of oxidation deformation, low temperature, and improved cold forming performance.

Active Publication Date: 2015-08-12
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention is used for structural steel. Since the structural steel and the high-temperature alloy involved in this patent belong to different metal material fields, the processing methods of the two alloys are essentially different, and the heat preservation time of this patent is very long, which is not applicable at all. Strip

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The method for improving the cold forming properties of the GH4090 cold-rolled strip in this embodiment adopts the following steps:

[0022] Step 1: Softening treatment before cold forming: first heat the air furnace to 960°C; then put the GH4090 cold-rolled strip into the air furnace, heat it up to 960°C, and keep it for 15 minutes; then take out the GH4090 cold-rolled strip and air-cool it to below 20℃; obtain softened GH4090 cold-rolled strip;

[0023] Step 2: cold-bend the GH4090 cold-rolled strip softened in step 1 according to the requirements of the part;

[0024] Step 3: Aging treatment after cold forming: first heat the air furnace to 680°C; then put the cold-bent formed workpiece in step 2 into the air furnace and keep it for 4 hours; then take out the workpiece and air-cool it to below 20°C to obtain aging Processed artifacts.

[0025] Table 1 provides the comparison of not softening and softening before cold forming in this example:

[0026] Table 1:

[...

Embodiment 2

[0029] The method for improving the cold forming properties of the GH4090 cold-rolled strip in this embodiment adopts the following steps:

[0030] Step 1: Softening treatment before cold forming: first heat the air furnace to 970°C; then put the GH4090 cold-rolled strip into the air furnace, and heat it up to 970°C for 10 minutes; then take out the GH4090 cold-rolled strip and air-cool it to below 20℃; obtain softened GH4090 cold-rolled strip;

[0031] Step 2: cold-bend the GH4090 cold-rolled strip softened in step 1 according to the requirements of the part;

[0032] Step 3: Aging treatment after cold forming: first heat the air furnace to 700°C; then put the cold-bent formed workpiece in step 2 into the air furnace and keep it for 3 hours; then take out the workpiece and air-cool it to below 20°C to obtain aging Processed artifacts.

[0033] Table 2 provides the contrast of not softening and softening before cold forming in this embodiment:

[0034] Table 2:

[0035] ...

Embodiment 3

[0037] The method for improving the cold forming properties of the GH4090 cold-rolled strip in this embodiment adopts the following steps:

[0038] Step 1: Softening treatment before cold forming: first heat the air furnace to 990°C; then put the GH4090 cold-rolled strip into the air furnace, and heat it up to 990°C for 15 minutes; then take out the GH4090 cold-rolled strip and air-cool it to below 20℃; obtain softened GH4090 cold-rolled strip;

[0039] Step 2: cold-bend the GH4090 cold-rolled strip softened in step 1 according to the requirements of the part;

[0040] Step 3: Aging treatment after cold forming: first heat the air furnace to 720°C; then put the cold-bent formed workpiece in step 2 into the air furnace and keep it for 4 hours; then take out the workpiece and air-cool it to below 20°C to obtain aging Processed artifacts.

[0041] Table 3 provides the contrast of not softening and softening before cold forming in this embodiment:

[0042] table 3:

[0043] ...

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PUM

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Abstract

The invention discloses a method for improving the cold forming performance of a GH4090 cold-rolled band. The cold forming performance of the GH4090 cold-rolled band is improved by the three stages of softening treatment before cold forming, cold bending forming, and aging treatment after the cold forming. Before the cold forming of a GH4090 component, a new heat treatment system is adopted and a once softening treatment process is added to reduce the hardness of a material, so that the cold forming is performed smoothly. The method has the advantages that firstly, the temperature in the softening treatment method is lower than common softening treatment (solid solution annealing temperature), the oxidation deformation degree of the component is low, and moreover, crystal grains of the GH4090 material cannot grow; secondly, by adopting the new process method, the hardness of the material of the component is reduced properly on the basis that guaranteeing the mechanical performance of the material is guaranteed, so that the material has proper hardness (HV289-399 / HRC30-40), the hardness is reduced, and meanwhile, the plasticity of the material is improved, and the cold forming performance of the material is improved.

Description

technical field [0001] The invention relates to the fields of materials and heat treatment, in particular to a method for improving the cold forming properties of GH4090 cold-rolled strips. Background technique [0002] GH4090 is an aging-strengthened nickel-deformed superalloy containing a relatively high amount of cobalt and various strengthening elements. The alloy has high tensile strength and creep resistance at 815 ~ 870 ℃, good oxidation resistance and corrosion resistance, high fatigue strength under the repeated alternating action of cold and heat, and good formability and welding. sex. It mainly supplies hot-rolled and cold-drawn bars, cold-rolled sheets, strips and cold-drawn wires. Used in turbine engine turbine disks, blades, high temperature fasteners, clamps, sealing rings and elastic elements, etc. [0003] GH4090 cold-rolled hard strip, the supply state is solution and cold-rolling, with high hardness (HV460~466 / HRC46.5~47.0), and subsequent cold forming ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/10
Inventor 刘红斌杨辉霍世军吴博赵刚张晓鹏
Owner AECC AVIATION POWER CO LTD