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Preparation method of GH3128 alloy bar

A GH3128, 1. GH3128 technology, applied in the field of GH3128 alloy rod preparation, can solve the problems of increased cost of multi-fire heating and heat preservation, increased processing and molding time, and difficult forging temperature control, so as to reduce production costs, reduce segregation, and improve The effect of tissue homogeneity

Inactive Publication Date: 2020-01-17
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] In patent 201510848784.8 and patent 201611149289.9, the preparation of GH4169 alloy rods adopts a multi-fire repeated upsetting process, but the temperature after forging needs to be strictly controlled, and the problem of large particle precipitation still exists
In patent 201810749244.8, aiming at the homogenization of alloy grains, GH3128 alloy rods are prepared by multi-fire horizontal and radial upsetting processes. This method is conducive to the uniformity of grains in all directions, but the processing time increases and the multi-fire The cost of secondary heating and heat preservation increases, and the control of forging temperature is difficult
At present, there is no process that can take into account both GH3128 control of microstructure uniformity and aging precipitation of μ phase

Method used

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  • Preparation method of GH3128 alloy bar
  • Preparation method of GH3128 alloy bar
  • Preparation method of GH3128 alloy bar

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preparation example Construction

[0014] Such as figure 1 , figure 2 , image 3 , Figure 4 The preparation method of the GH3128 alloy bar shown includes the following steps: a. First, homogenize the electroslag ingot with low tungsten content; Long, the first pass pre-compacting and elongating deformation is 20% to 30%, and the second pass deformation is 25% to 35%, so as to break the cast structure of the electroslag ingot; c, carry out the first fire and four passes Sub-diameter forging billet, the first pass uses 90 strikes / min, the deformation is 5% to 10%, and the bar is rounded; the second strike is 180 strikes / min, the deformation is 25 % to 30%, to realize the recrystallization of the forged bar structure; the third strike frequency is 180 times / min, and the deformation amount is 15% to 20%, which coordinates the overall deformation of the bar and increases the uniformity of the structure; the fourth strike frequency is 180 times / min, shaping to size, and then air-cooled car repairing.

[0015] ...

Embodiment

[0018] The electroslag ingot is firstly held at 1150°C for 5 hours to complete the homogenization heat treatment; then the anvil is used on a small tonnage press to carry out two pre-compaction and elongation, and the first pre-compaction and elongation deformation is 20% ~30%, the deformation amount of the second pass is 25%~35%; finally, the billet is directly opened on the 18MN radial forging machine, and the forging process is one fire and four passes, and the first pass adopts 90 blows / min Frequency, the deformation is 5% to 10%, and the bar is rounded; the strike frequency of the second pass is 180 times / min, and the deformation is 25% to 30%, to realize the recrystallization of the forged rod structure, especially to improve the bar Tissue recrystallization in the heart; the third blowing frequency is 180 times / min, and the deformation amount is 15% to 20%, which coordinates the overall deformation of the bar and increases the uniformity of the tissue; the fourth blowing...

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Abstract

The invention relates to the field of high-temperature alloy forging methods, in particular to a preparation method of a GH3128 alloy bar, and the method effectively realizes the forming of the low-tungsten GH3128 bar and simultaneously has uniform bar structure and reduced mu phase aging precipitation amount. The preparation method comprises the following steps: a, carrying out homogenization heat treatment on an electroslag ingot with low tungsten content; b, carrying out two-pass pre-pressing and full-drawing on the electroslag ingot subjected to homogenization heat treatment; and c, performing one-fire four-pass radial forging cogging, reshaping to be in place, and then repairing and molding by an air cooling vehicle. According to the method, after homogenization, pre-pressing and fulldrawing are carried out, so that the crushing of the as-cast structure of the electroslag ingot is facilitated, the structure is converted into equiaxed crystal, and the equiaxed crystal is used as an intermediate blank for radial forging forming. The preparation method is particularly suitable for the fields of preparation processes of GH3128 alloy bars.

Description

technical field [0001] The invention relates to the field of high-temperature alloy forging methods, in particular to a method for preparing GH3128 alloy rods. Background technique [0002] GH3128 is a nickel-based alloy that is strengthened by solid solution of tungsten and molybdenum and strengthened by boron, cerium and zirconium at the grain boundary. It has high plasticity, high permanent creep strength and good oxidation resistance and stamping and welding properties. GH3128 is mainly used in the fields of gas turbine engines and combustor flame tubes that work for a long time below 950 °C. With the advancement of science and technology and the change of the application environment of the alloy, the requirements for the performance of the alloy are constantly being raised. It can be known from the aviation material handbook that the alloy contains more than 8% tungsten content, and the tungsten increases the precipitation tendency of the μ phase in the alloy. It will ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/06B21J1/06C22F1/10
CPCB21J1/06B21J5/06C22F1/10
Inventor 赖宇刘庭耀付建辉蒋世川
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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