Manufacturing method for producing high-temperature alloy GH4169 fine-grained bar through combined high-speed and radial forging

Abstract

The present invention discloses a manufacturing method for producing a high-temperature alloy GH4169 fine-grained bar through combined high-speed and radial forging with the purpose of providing the alloy bar with grains at an equally high grain size number. The present invention employs the following technical scheme: repeated upsetting and stretching are carried out to an alloy ingot using a high-speed forging machine, with 25% to 35% upsetting deformation in each firing; cooling and cogging are carried out firing by firing, with a cooling gradient d from 1110+ / -10 DEG C to 1100+ / -10 DEG C to 1080+ / -20 DEG C to 1040+ / -20 DEG C; before radial forging, a blank is heated at a temperature ranging from 990 to 1020 DEG C with heat preserved for 40 to 120 min, and then forged in one firing on a radial forging machine to a finished bar size, with a final forging temperature not lower than 950 DEG C, and carrying out water cooling to a room temperature after the radial forging. The manufacturing method for producing a high-temperature alloy GH4169 fine-grained bar through combined high-speed and radial forging has the following technical effects: (1) the microstructure uniformity of a bar is significantly improved with a completely recrystallized equiaxial grain structure from the periphery to the center of the bar, and the grain size may reach grade six or higher; and (2) the head and tail of a bar are uniform and homogeneous in structure; and (3) stable batch production of bars is achieved.

Description

technical field [0001] The invention belongs to the field of metal material manufacturing, and relates to a method for jointly producing high-temperature alloy GH4169 fine-grained rods with a fast forging machine and a radial forging machine, so as to obtain an equiaxed fine-grained structure. Background technique [0002] GH4169 alloy is a precipitation-strengthened nickel-chromium-iron-based superalloy, because it has high tensile strength, yield strength, durable strength and plasticity between -253°C and 650°C, and has good corrosion resistance , anti-radiation and welding performance, it has become the material of choice for aerospace engine turbine discs and shafts. The characteristic of this material processing is that the material is very sensitive to thermal processing parameters, such as heating temperature, holding time, opening forging temperature, final forging temperature, deformation amount, deformation rate, etc., and obtains fine-grained forging with uniform...

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Problems solved by technology

The GH4169 alloy bar produced according to the traditional process of direct forging machine into material has high heating and refiring temperature, poor microstructure accumulation and refinement effect between each firing, and the finished product structure is coarse; the outer edge of the bar is deformed The degree is poor, the forging rhythm is slow, the final forging temperature is low, and the dynamic recrystallization degree of the outer edge of the bar is low. Depending on the forging specification, it is black crystal, necklace crystal and mixed crystal structure in the range of 0-30mm (respectively as figure 1 , figure 2 and image 3 shown), if this organization is not properly controlled, it will be left to the finished forging and produce waste products; at the same time, in recent years, with the development of high-quality, high-reliability, and long-life aerospace engines in my country, the engine turbine disc and shaft Microstructure Control of GH4169 Alloy Forged Bars Puts Higher Requirements

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