An optimized forging process for gh6783 alloy bar

An alloy bar and process technology, applied in the field of metal forging technology, can solve the problems of uneven distribution of β phase, forging cracks, poor forging plasticity, etc. Effect

Active Publication Date: 2021-02-23
FUSHUN SPECIAL STEEL SHARES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the existing forging process is characterized by the heating temperature of 1100°C±10°C throughout the process, there are two problems in the production of this alloy. The first is that the forging plasticity is poor and there are forging cracks; the second is that the distribution of β phase after forging is uneven ( See figure 1 )

Method used

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  • An optimized forging process for gh6783 alloy bar
  • An optimized forging process for gh6783 alloy bar
  • An optimized forging process for gh6783 alloy bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021]GH6783 alloy bar, specification φ200mm.

[0022]The steel ingot produced by a double vacuum process is φ406mm, the actual heating temperature is 1110 ° C, and it is produced after 2 h.

[0023]First fire forging: first fire, heating temperature 1110 ° C, forging single hammer compression amount of 50 mm, forged to 300 mm, back furnace, deformation amount of 30.5%.

[0024]Mid-fire forging: second fire, heating temperature 1080 ° C, forged single hammer compression amount of 40 mm, forged to φ280 mm, back furnace, deformation amount of 31.6%.

[0025]The third fire, the heating temperature is 1060 ° C, the amount of the upset, the amount of the upset deformation is 30%.

[0026]The fourth fire, the heating temperature is 1050 ° C, unute, a single hammer is 40 mm, forged to φ270 mm, and the deformation is 29%.

[0027]The fifth fire, the heating temperature is 1050 ° C, the upset, the amount of the upset deformation is 35%.

[0028]The sixth fire, the heating temperature is 1040 ° C, unute, a single...

Embodiment 2

[0032]GH6783 alloy bar, specification φ200mm.

[0033]The steel ingot produced by a double vacuum process is φ406mm, the actual heating temperature is 1090 ° C, and it is produced after 2 h.

[0034]First fire forging: the first fire, heating temperature 1090 ° C, forging single hammer compression is 50mm, forged to 300 mm square, back furnace, deformation amount of 30.5%.

[0035]Mid-fire forging: second fire, heating temperature 1060 ° C, forged single hammer pressure below 40 mm, forged to φ280 mm, back furnace, deformation amount of 31.6%.

[0036]The third fire, the heating temperature is 1050 ° C, the amount of upset, the amount of the upset deformation is 30%.

[0037]The fourth fire, the heating temperature is 1050 ° C, unute, a single hammer is 40mm, forged to 220 mm, and the deformation is 38.5%.

[0038]Last fire forging: the fifth fire, heating temperature 1000 ° C, unute, single hammer pressure below 40 mm, forged from 220 mm to φ200mm bar, 35.1%.

[0039]Bar test: GH783 alloy bar has good ...

Embodiment 3

[0041]GH6783 alloy bar, specification φ200mm.

[0042]The steel ingots produced by the double vacuum process, the size is φ406mm, the actual heating temperature is 1100 ° C, and the heat is produced after 2 hours.

[0043]First fire forging: first fire, heating temperature 1100 ° C, forging single hammer pressure below 50 mm, forged to φ315 mm, back furnace, deformation amount of 39.8%.

[0044]Middle fire forging: second fire, heating temperature 1080 ° C, upsetting, upsetting 30%.

[0045]The third fire, the heating temperature is 1040 ° C, unute, a single hammer is 40 mm, forged to φ280 mm, and the deformation amount is 40%.

[0046]The fourth fire, the heating temperature is 1040 ° C, the amount of upset, the upset deformation is 35%.

[0047]The fifth fire, the heating temperature is 1030 ° C, unute, a single hammer is 40 mm, forged to φ270 mm, and the deformation amount is 30%.

[0048]Last fire forging: sixth fire, heating temperature 990 ° C, unute, single hammer is 40mm, from φ270 mm forged to ...

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Abstract

The invention discloses an optimized forging process for GH6783 alloy rods. By improving the heating process, adopting stepwise temperature control and staged forging, the purpose of improving the plasticity of the alloy and making the forged β phase evenly distributed can be achieved. The technical scheme of the present invention is as follows: the forging process of the GH6783 alloy bar is as follows: ingot heating→first fire forging→intermediate fire forging→final fire forging→bar finishing→bar performance inspection→bar finishing→rod Material performance inspection; through the over-aging treatment between 820 ° C and 880 ° C during the heating process of the ingot, the plasticity of the GH6783 alloy steel ingot is improved, and the refinement and uniform distribution of the forged β phase are promoted by step temperature control forging. The advantages of the present invention are: firstly, through the overaging treatment at 820°C to 880°C, the plasticity of the alloy is greatly improved, and the difficulty of subsequent processing is reduced; secondly, the stepwise temperature-controlled forging is used to promote the continuous dissolution and precipitation of the β phase, Further make the β phase evenly and finely distributed.

Description

Technical field[0001]The present invention belongs to a metal forging process, and specifically, a forging process suitable for use in GH6783 alloy bars.Background technique[0002]The GH6783 alloy is iron cobalt nickel-based anti-oxidative low expansion alloy using niobium, aluminum, and titanium, is the most widely used ferromagnetic material, which is a typical characteristic of the alloy, which is 5.0% to 6.0%. , By forming the γ 'phase and the β phase in the austenite matrix. Since the existing forging process is characterized by 1,1100 ° C ± 10 ° C heating temperature, it has caused two problems in production, and the first is to forge plasticity, and there is forged cracks; the second is that the β phase distribution is uneven after the forging. seefigure 1 ).Inventive content[0003]The present invention discloses an optimized forging process of GH6783 alloy bar, by improving the heating process, using a step temperature control, grading forging, can achieve the improvement of a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12C21D9/00
CPCC21D8/1222C21D9/0075
Inventor 王志刚张玉春李爱民候智鹏张鹏李宁王艾竹刘猛李成龙赵长顺韩魁
Owner FUSHUN SPECIAL STEEL SHARES
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