Forging method for high-temperature alloy GH3617M forged pieces

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 ...

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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.

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