Cogging method for large GH4738 high-temperature alloy ingot

A high-temperature alloy and alloy ingot casting technology, which is applied in the field of GH4738 high-temperature alloy large-scale ingot casting, can solve problems such as instability, uneven structure, mixed crystal performance of grain structure, etc., to improve yield and stability, crystal The particles are uniform and fine, and the effect of satisfying the uniformity of fine grains

Active Publication Date: 2015-12-23
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at cracking and uneven structure of large ingots of the difficult-to-deform nickel-based superalloy GH4738, and ensuring that subsequent forgings can obtain uniform and fine grain forgings, the purpose of the present invention is to solve the problem of a large-scale casting of GH4738 nickel-based superalloy. The problem of ingot blanking method can effectively solve the problems of serious mixed crystal grain structure and unstable performance of subsequent forgings, and control the stability of alloy performance to the greatest extent

Method used

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  • Cogging method for large GH4738 high-temperature alloy ingot
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  • Cogging method for large GH4738 high-temperature alloy ingot

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Experimental program
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Effect test

Embodiment 1

[0024] A kind of GH4738 superalloy large-scale ingot blanking method steps are as follows:

[0025] (1). Put the homogenized large ingot into the heat treatment furnace to heat and keep it warm. The size of the large alloy ingot is Φ510mm;

[0026] (2). Upset the steel ingot heated to the specified temperature to obtain the first cake, and then lengthen the cake to obtain the secondary bar;

[0027] (3). Heating the secondary bar, upsetting to obtain a secondary cake base, and then lengthening the cake base to obtain a third bar, so as to obtain a uniform and fine-grained bar base.

[0028] The specific steps are as follows: heat the large ingot of GH4738 nickel-based superalloy in the heating furnace to 1170°C, and then heat it on the rapid forging hydraulic press for 1s -1 Upsetting the steel ingot to 50% of the height of the original steel ingot to obtain a cake base, and then changing the length of the first cake base back to 80% of the height of the original steel ingot ...

Embodiment 2

[0033] A kind of GH4738 superalloy large-scale ingot blanking method steps are as follows:

[0034] (1). Put the homogenized large ingot into the heat treatment furnace to heat and keep it warm. The size of the large alloy ingot is Φ620mm;

[0035] (2). Upset the steel ingot heated to the specified temperature to obtain the first cake, and then lengthen the cake to obtain the secondary bar;

[0036] (3). Heating the secondary bar, upsetting to obtain a secondary cake base, and then lengthening the cake base to obtain a third bar, so as to obtain a uniform and fine-grained bar base.

[0037] The specific steps are as follows: heat the large ingot of GH4738 nickel-based superalloy in a heating furnace to 1180°C, and then place it on the rapid forging hydraulic press for 1s -1 Upset the steel ingot to 50% of the height of the original steel ingot to obtain a cake base, and then change the length of the first cake base back to 100% of the height of the original steel ingot to obt...

Embodiment 3

[0042] A kind of GH4738 superalloy large-scale ingot blanking method steps are as follows:

[0043] (1). Put the homogenized large ingot into the heat treatment furnace to heat and keep it warm. The size of the alloy ingot is Φ508mm;

[0044] (2). Upset the steel ingot heated to the specified temperature to obtain the first cake, and then lengthen the cake to obtain the secondary bar;

[0045] (3). Heating the secondary bar, upsetting to obtain a secondary cake base, and then lengthening the cake base to obtain a third bar, so as to obtain a uniform and fine-grained bar base.

[0046] The specific steps are as follows: heat the large ingot of GH4738 nickel-based superalloy in the heating furnace to 1170°C, and then heat it on the rapid forging hydraulic press for 1.5s -1 Upsetting the steel ingot to 40% of the height of the original steel ingot to obtain a cake base, and then changing the length of the first cake base back to 80% of the height of the original steel ingot to obt...

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Abstract

The invention discloses a cogging method for a large GH4738 high-temperature alloy ingot. According to the method, a bar billet with even and fine grains is obtained through multiple times of heading, drawing, forging and cogging conducted on a homogenized alloy steel ingot, so that the requirement for control over homogeneity of the fine-grained microstructure of the large-size alloy forge piece is met. In the forging and cogging control process, the cogging temperature, deformation amount and deformation speed are strictly controlled, heading, drawing and cogging are conducted repeatedly, forging is conducted by the adoption of glass lubricants and a coating insulation mode, and finally the bar billet of the even fine-grained microstructure is obtained. The cogging method can be applied to cogging and forging of the large GH4738 nickel-based high-temperature alloy ingot to produce the fine-grained bar billet.

Description

technical field [0001] The invention relates to a billet opening method for thermal processing of a nickel-based deformed superalloy in the metallurgical industry, in particular to a method for billeting a large ingot of a GH4738 superalloy. Background technique [0002] Waspaloy alloy (called GH864 alloy or GH4738 alloy in my country) is a high-temperature alloy developed by SpecialMetal in NewHartford for the first time in 1952 by vacuum smelting method. It is mainly equipped in J48 aircraft engine of Pratt & Whitney (PWA-Pratt&Whitney) aircraft engine company in the United States. On turbine blades; in the 1960s, the United States chose this alloy to replace iron-based and iron-nickel-based superalloys to make turbine disks that are stable below 800 °C and installed in Boeing 727 and Boeing 747 engines. GH864 alloy has good strength-toughness matching, high tensile and durable strength below 760°C, good oxidation resistance below 870°C, and is widely used in aerospace, pet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10
Inventor 姚志浩于秋颖董建新张麦仓
Owner UNIV OF SCI & TECH BEIJING
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