Numerical Simulation Of Forming Process And Experiment Study On Fe(Cu)-Al Binary Alloy Prepared By Laser Sintering

In this paper,both numerical and experiment method were used to study the forming process of Fe-Al and Cu-Al binary alloy prepared by laser ignition induced SHS.The model of laser sintering was established by ANSYS.The boundary condition and load were setted according to real experiment,then temperature and stress field was calculated.Finally,the numerical simulation results was validated by experiment.In addition,In order to better understand the properties of sample,the microstructure and mechanical properties was analyzed.The main contents were as follows:?1?Study on the mechanisms and thermodynamics of laser ignition induced SHS,the driving force of powder particles integrate was surface decrease.?2?ANSYS software was used to simulate the temperature field and stress field of Fe50Al50,simulation results showed that:the surface layer temperature was 1174K,the central layer was 938K,the bottom temperature was 870K;The stress decreases with the time in the sintering process,the stress in the central zone was greater than the surface area and the bottom area at each time,the maximum stress occured about two-thirds of the sample from the bottom,the stress in the bottom area was the lowest.Finally,Fe50Al50 binary alloy was prepared by laser sintering,the experiment results showed that:The main phases of the alloy at upper surface was FeAl,the central layer of the alloy were Fe₃Al and FeAl,the bottom layer of the alloy was Fe₃Al;The hardness of the middle layer was the highest,which was 916HV;The wear resistance was the lowest,which was 0.46mg/mm².Through the analysis of laser induced self-propagating reaction thermodynamics characteristics of Fe-Al alloy and the results of simulation.It can predict that the product phase of every layer was consistent with experimental results.The simulation method was reliable.?3?ANSYS software was used to simulate the temperature field and stress field of Cu75Al25 binary alloy,Simulation results showed that the surface layer temperature was 1112K,the central temperature was 910K,the bottom temperature was 852K;The stress decreases with the time in the sintering process and the stress was the lowest in the bottom area.Finally,Cu75Al25 binary alloy was prepared by laser sintering,the experiment results showed that:The main phases of the alloy at upper surface was Cu₃Al and?-Cu+Cu₉Al₄,the middle layer of the alloy were?-Cu+Cu₉Al₄ and CuAl,the bottom layer of the alloy was?-Cu+Cu₉Al₄.The hardness of the middle layer was the highest,which was 288.1HV.The wear resistance was the lowest,which was 2.98mg/mm².Through the analysis of laser induced self-propagating reaction thermodynamics characteristics of Cu-Al alloy and the results of simulation,It can predict the product phase of every layer were consistent with experimental results.It can prove that the choice of the mathematical model was reasonable and the simulation method was reliable.