Numerical Simulation Of Composition And Heat Treatment Process Optimization Of 2324 Aluminum Alloy

2324 aluminum alloy has excellent comprehensive performance,especially high damage tolerance performance.As a structural material,it has been widely used in advanced large aircraft.Its alloying element content and heat treatment process are the keys to ensure high comprehensive performance.This paper takes2324 aluminum alloy as the research object,uses JMatPro software to simulate and calculate the influence of different alloy element content on the structure and performance of 2324 aluminum alloy,and optimizes the alloy composition through comprehensive analysis results.The equilibrium phase diagram is used to analyze the temperature range of solid solution,TTT/CCT curve is drawn to determine the sample transfer time and the critical cooling rate of precipitated phase,and the homogeneous and pre-aging heat treatment parameters are optimized.The simulation results are firstly co MPared with the existing results in the literature,and then co MPared with the experimental results to verify the reliability of the results.It is found that the content of impurity elements Fe and Si has a significant i MPact on the structure and performance of 2324 aluminum alloy.With the increase of the content,the total amount of hardening phase,hardenability and mechanical performance of the alloy,the conductivity decreases correspondingly.The mechanical performance and electrical conductivity begin to decline sharply from 0.1%Fe and 0.083%Si.When the content of impurity elements is controlled within the range of Fe<0.02%and Si<0.017%,the coarse inclusion phase Al₇Cu₂Fe and the hard brittle phase Mg₂Si no longer appear,which can effectively improve the comprehensive properties of the alloy.The alloy elements Cu,Mg and Mn have different effects on the mechanical performance and electrical conductivity of 2324 aluminum alloy.Among them,Mn has an obvious effect on the mechanical performance of the alloy.For every 0.2%increase in content,the mechanical performance can be improved by about 4%,the mechanical performance increases linearly with the increase of Mn content.Cu has an obvious influence on its mechanical performance within a certain range,and the influence of Cu tends to saturation since the content is 4.2%.For Mg element,with the increase of Mg element content,the mechanical properties first increases and then decreases;The influence of alloy elements on the conductivity is not the same,Mg has obvious influence on it in a certain range,but the influence of Mn and Cu is linear.At the same time,with the increase of Mn content,the dendrite spacing decreases and the grain size becomes smaller.By comprehensive analysis and co MParison,with Fe<0.02%,Si<0.017%,1.6%Mg,4.2%Cu,0.9%Mn 2324aluminum alloy has better comprehensive performance and fine grain structure.After the optimization of the alloy composition,with the thermal insulation 20 h uniform annealing at 495?,the solid solution treatment at 505?,and natural aging 10 h,the cooling speed of the cooling medium is greater than 7.37?/s,and the cooling speed of the sample solution transfer time less than 5.75 s could restrain the precipitation of the second phase,obtain the supersaturated solid solution,better improve the influence of dendrite segregation,and at the same time get good mechanical properties.Finally,the composition and heat treatment process of the optimized 2324aluminum alloy are verified by experiments.The results show that the alloy has uniform structure,no excessive coarse inclusion phase inside the alloy,fine grain,and good damage tolerance limit performance.At the same time the alloy after optimized heat treatment,the segregation phenomenon is obviously resolved and the solid solution is sufficient;The performance test results are basically consistent with the simulation results.The tensile strength and yield strength of T39 process along the rolling direction are 471 MPa and 372 MPa respectively,the transverse tensile strength and yield strength are 476 MPa and 375 MPa respectively,and the conductivity is 30.11 MS/m,which all meet the requirements of BMS7-254E standard.The numerical simulation research carried out in this subject has a certain accuracy and practicability,and provides theoretical guidance for industrial production of 2324 aluminum alloy.