Study On Key Technologies Of Cross-wedge Rolling Of Superalloy Shaft

Superalloy having excellent resistance to mechanical damage and chemical properties and structural stability in the high temperature environment.Superalloy materials focused primarily used in aerospace field.It is the material of choice for aircraft engines.It has an irreplaceable position in the development of modern aviation industry.Superalloys due to its excellent properties are increasingly widely used in electrical,automotive,military,chemical and other fields.However,compared with ordinary steel,superalloys have the characteristics of high price,low hot working plasticity and large deformation resistance.The traditional processing methods such as cutting and forging have the disadvantages of low material utilization and low production efficiency.This paper proposes the use of cross-wedge rolling shaft parts superalloy forming process,and can improve the utilization efficiency of the high temperature alloy materials,and further wedge rolling process with high precision,good working environment and so on.At present,the cross wedge rolling process has been widely used in actual production,but the research on superalloys is still relatively small.The process parameters of each die of the cross wedge rolling process have a great influence on each other.Unreasonable process parameters will lead to poor mechanical properties of the formed parts and defects in the heart.In this paper,the most widely used GH4169 alloy in superalloys is taken as the research object,combined with the principle of the cross wedge rolling process.Establish the alloy material model in DEFORM-3D to simulate the forming process of cross wedge rolling,and understand the metal flow law of GH4169 alloy formed by cross wedge rolling by analyzing the stress and strain field,rolling force and metal flow velocity of the alloy.The simulation data is extracted through the post-processing function of the software to understand the microstructure changes of GH4169 alloy formed by cross wedge rolling at different forming temperatures,stretching angles,forming angles and area reductions.A comprehensive analysis of various influencing parameters was carried out,and the primary and secondary relationships of the influence of process parameters on grain size were obtained: forming temperature,area reduction,stretching angle and forming angle.By analyzing the mechanism of the looseness and shrinkage defects in the center of the cross wedge rolling,and combining the simulation data,it is concluded that under the conditions of this simulation,and when the end shrinkage rate is greater than 40%,the smaller the end shrinkage rate,the core quality The better;the larger the forming angle,the less likely the heart defect will appear;the smaller the stretching angle,the less likely the heart defect will appear.