A Method for Establishing Stiffness Prediction Model of IC10 Directional Solidification Material

Abstract

The invention discloses a method for establishing a stiffness model of an IC10 directional solidification material by considering influence of a grain boundary and a loading direction. The method comprises the following steps of: (1), performing a monotonic tensile test of an IC10 mono-crystal at room temperature along the directions [001], [010] and [011]; (2), performing a monotonic tensile test of an IC10 directional solidification alloy at room temperature along different loading directions; (3), observing the IC10 directional solidification alloy by using a scanning electron microscope and a transmission electron microscope; (4), on the basis of the mono-crystal performance, establishing a stiffness prediction model of the IC10 directional solidification alloy, and obtaining model parameters through software calculation; and (5), after completing model establishing, verifying Young modulus of the IC10 directional solidification alloy along different loading directions. By means of the method disclosed by the invention, the Young modulus loaded by the IC10 directional solidification material along different loading directions can be accurately predicted; accurate elastic material parameters can be provided for further strength and fatigue research of the material; and thus, the method has a great significance for engineering design of the material.

Description

technical field [0001] The invention relates to the field of aviation materials, in particular to a method for establishing a stiffness model of a directionally solidified superalloy material for a turbine disk. Background technique [0002] Directional solidification superalloy is one of the new superalloys developed to meet the increasing gas temperature before the turbine of aero-engines. The so-called directional solidification means that when the superalloy melt solidifies in the mold, columnar crystals almost parallel to each other are generated by controlling the growth direction of the grains. The direction of grain growth of directionally solidified alloys is parallel to the direction of the largest principal axis of the material, and its mechanical properties are generally better than those of polycrystalline materials with general grain boundaries. At present, the acquisition of elastic constants of directionally solidified alloys is based on experiments or appro...

AI Technical Summary

Problems solved by technology

At present, the acquisition of elastic constants of directionally solidified alloys is based on experiments or approximately replaced by single crystal elastic constants. The first method requires a large number of experiments and is expensive. The second method has low prediction accuracy and cannot meet engineering requirements in most cases. Accuracy requirements

[0003] At present, the easiest way to predict the elastic constants of polycrystals is the average method of Voigt and Reuss. Based on the constant strain assumption, Voigt gives the upper limit of the true solution of the effective modulus of polycrystals. Reuss gives the effective modulus of polycrystals based on the assumption of equal stress. The lower limit of the real solution. Although this method is good for predicting the elastic constant of general polycrystals, it is not suitable for direct prediction of directionally solidified alloys because it does not consider the influence of directionally solidified alloy grain boundaries.

Some researchers have established a prediction method for the elastic constant of directionally solidified alloys using the self-consistency theory, but the implementation process is relatively complicated and requires repeated iterations, and the engineering application has certain limitations

Images