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Forging method for high-temperature alloy GH3617M forged pieces

A GH3617M, superalloy technology, applied in the field of forging, can solve the problems of unfavorable forging forming, overall deformation, excessive grain size, etc., and achieve the effect of improving the high temperature lasting strength, preventing excessive energy and meeting the requirements of use.

Active Publication Date: 2015-07-29
WUXI PAIKE HEAVY CASTING & FORGING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] GH3617M is a high-alloyed aging-strengthened nickel-based deformed superalloy, which is often used in the manufacture of gas turbines. Gas turbines are an advanced and complex complete set of power machinery equipment. They are typical high-tech intensive products. Technology is restricted by others. At present, in the casting process of gas turbine forgings, the ingot is usually directly drawn and then forged to the delivery size. Due to the large amount of as-cast dendrite structure in the ingot and the excessive grain size after homogenization ( Including shrinkage cavity, porosity), so that after the ingot is elongated, the grain size cannot meet the requirements, so that it is not conducive to the subsequent billet forging forming, the overall deformation is insufficient, the grain size of the forging cannot be satisfied, and the mechanical properties at room temperature are low. High-temperature transient mechanical properties and high-temperature durable strength cannot meet the requirements of gas turbines.

Method used

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  • Forging method for high-temperature alloy GH3617M forged pieces
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  • Forging method for high-temperature alloy GH3617M forged pieces

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Embodiment 1

[0023] Such as figure 1 As shown, the first step: the first heating stage: select an ingot with a temperature not higher than 300 °C and a weight of 2000 kg, put it into the heating furnace, raise the temperature to 850 °C according to the power, and keep it for 6 hours.

[0024] The second step: the second heating stage: put the ingot with a temperature of 850°C obtained in the first step into the heating furnace again, raise the temperature to 1180°C according to the power, and keep it for 2 hours.

[0025] The third step: the first forging: erect the ingot obtained in the second step with a temperature of 1180°C and a size of Φ500*1220mm (diameter*height) and perform the first upsetting to Φ660*700 (diameter*height) , in such as figure 1 As shown in the schematic diagrams of A and B in , then the ingot after the first upset is drawn for the first time (such as figure 1 As shown in the picture in C) and chamfered to 450*1170 (length, width*height).

[0026] The fourth ste...

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Abstract

The invention relates to a forging method for high-temperature alloy GH3617M forged pieces. According to the forging method, by heating and heat-insulating processes of three stages, the internal and external temperature of a cast ingot can be uniform through staged heating, temperature difference is reduced, and crystal grains are prevented from being coarse and bulky; the grain size of the forged pieces obtained by using the method provided by the invention is not coarser than a level 4, and coarse and fine inclusions of the forged pieces do not exceed a level 2; through three forging stages, after solution annealing, the forged pieces have the characteristics that the room-temperature yield property is not lower than 320Mpa, the room-temperature tensile property is 700-980Mpa, the elongation percentage is not lower than 35%, the end face shrinkage ratio is not lower than 35%, the impact property is not lower than 120J, the hardness HBW is 200-250, the high-temperature instantaneous mechanical properties and high-temperature endurance strength are greatly improved, and thus, the use requirements of a gas turbine are effectively met.

Description

technical field [0001] The invention relates to the field of forging, in particular to a forging method of a GH3617M superalloy forging. Background technique [0002] GH3617M is a high-alloyed aging-strengthened nickel-based deformed superalloy, which is often used in the manufacture of gas turbines. Gas turbines are an advanced and complex complete set of power machinery equipment. They are typical high-tech intensive products. Technology is restricted by others. At present, in the casting process of gas turbine forgings, the ingot is usually directly drawn and then forged to the delivery size. Due to the large amount of as-cast dendrite structure in the ingot and the excessive grain size after homogenization ( Including shrinkage cavity, porosity), so that after the ingot is elongated, the grain size cannot meet the requirements, so that it is not conducive to the subsequent billet forging forming, the overall deformation is insufficient, the grain size of the forging ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00C22F1/10
Inventor 刘其源刘智陈翠李湘军何方有宁兆荣
Owner WUXI PAIKE HEAVY CASTING & FORGING
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