Manufacturing method of novel high-performance ultra-fine grain GH4169 metal turbine disc

Abstract

The invention discloses a manufacturing method of a novel high-performance ultra-fine grain GH4169 metal turbine disc. The method has the following steps: placing a GH4169 material alloy substrate inan inert gas protection box, clamping and fixing the GH4169 material alloy substrate, sealing the box, introducing argon for protection, performing GH4169 alloy turbine disc laser three-dimensional forming by adopting a high-precision three-way coaxial powder feeding system, and performing the laser three-dimensional forming according to a forming track until a first layer is fused, wherein the laser power is 3500W, the scanning speed is 5mm / s, the diameter of a light spot is 4mm, the overlapping rate is 40%, the powder feeding rate is 10 g / min; carrying out planar point type forging and pressing on a laser-fused forge piece, wherein the diameter of a pressure head is 1.5-3 mm, the rolling reduction is 8 tons, and the rolling reduction distance is 0.3-0.5 mm, the overlapping rate is 40%; repeating the steps until the standard size is reached; and subjecting the turbine disc forge piece to two-stage aging heat treatment, wherein the temperature is 950-1100 DEG C, the time is 1 h, and the turbine disc forge piece is air-cooled to the room temperature. According to the method, the turbine disc is directly formed through continuous point type forging and pressing laser three-dimensional forming, it can be guaranteed that the grain size of a forged piece reaches or is even smaller than 11.2 micrometers, and therefore the GH4169 alloy turbine disc has excellent fatigue performance.

Description

technical field [0001] The invention relates to a novel method for manufacturing a high-performance ultra-fine grain GH4169 metal turbine disk. Background technique [0002] As one of the core parts of an aero-engine, the turbine disk is a bridge connecting the turbine shaft and blades. As one of the key factors for the service life of an aero-engine, the turbine disc is prone to failure during the service of the engine because it works in a harsh environment with high speed and thermo-solid coupling for a long time. In the process of turbine disk material selection, the allowable temperature of the material and the stable service life at this temperature should be fully considered. The main considerations are: high impact toughness and low notch sensitivity, high creep fatigue resistance , good oxidation and corrosion resistance and excellent cutting performance. Nickel-based superalloys are widely used in the design of engine turbine disks due to their high specific stre...

AI Technical Summary

Problems solved by technology

However, up to now, there is not enough understanding of the microscopic deformation mechanism and damage evolution mechanism of turbine disks in engineering. How to evaluate the strength and life prediction of turbine disks from the microscopic mechanism is still the core problem to be solved urgently.

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