Numerical Simulation And Experimental Study Of Multi-directional Strong Strain Aluminum Bronze Alloy

QAl9-4 aluminum bronze alloy is a bronze alloy with an aluminum content of 8% ? 10%,and it is widely used in the field of mechanical engineering.Facing the increasing demands of modern industry,the performance of aluminum bronze alloys has higher requirements.In order to improve the mechanical properties of the aluminum bronze alloy,through the large plastic deformation technology and aging treatment,it is processed into a large volume and dense ultrafine crystal/nanocrystalline material to obtain an ultrafine crystal aluminum bronze alloy with high strength and excellent plasticity.This article mainly used a combination of experiment and numerical simulation to analyze the parameters of QAl9-4 aluminum bronze alloy that are difficult to measure during multi-directional forging and hot compression,such as the temperature field,velocity field,equivalent strain during the test,and after the test The distribution of crystal grains,etc.The model of multi-directional forging test and hot compression test of the aluminum bronze alloy was established to provide reference for the optimization of actual processing technology.The specific research work is as follows:(1)After the multi-directional forging test of QAl9-4 aluminum bronze alloy,excellent mechanical properties were obtained,and the average grain size of aluminum bronze alloy was 10.06?m.Through the hot compression test,the true stress-true strain curve of the aluminum bronze alloy is obtained.(2)Based on the obtained true stress-true strain curve,the high temperature flow stress constitutive equation and dynamic recrystallization related model of aluminum bronze alloy are calculated.(3)Using Deform-3D software to numerically simulate the multi-directional forging process,the relationship between the temperature field,equivalent strain,velocity field and plastic deformation of the forgings is obtained.It is simulated that the average grain size inside the material after forging is between 2.3?m and 26.2?m,and the dynamic minimum crystallization reaches 0.069?m,achieving the goal of ultrafine grain,which can be made for the distribution of sample grains after actual multi-directional forging Valuable reference.(4)The thermal compression process is numerically simulated,and the accuracy of the model is verified from two aspects: equivalent strain and equivalent stress.And the analysis draws the conclusion that strain rate is negatively correlated with dynamic recrystallization volume percentage and average grain size,temperature is positively correlated with dynamic recrystallization volume percentage,and negatively correlated with average grain size.