Study On Microstructure Evolution And Thermal Conductivity Simulation Of ZL101 Aluminum Alloy Under Centrifugal Conditions

In recent years,China's aluminum production is gradually increasing,more and more industries pursue lightweight equipment,the use of aluminum alloy more and more widely.Therefore,in this social environment,the industry put forward higher requirements for the design and development of aluminum alloy preparation process.Computer simulation technology can promote the development of technology and improve the efficiency of designers.With the continuous development and upgrading of new numerical simulation analysis software,the model and algorithm are further optimized.However,the reliability of numerical simulation is still a task that needs constant and repeated verification.Common casting methods for Al-Si alloys are sand casting and special casting.For ZL101 alloy special casting,the processing industry system in China is still not perfect,the development and application of limited types,production quality is not high enough,so the application of products is limited.Especially ZL101 alloy high quality special casting products,can not achieve mass production.Therefore,it is necessary not only to introduce new technologies,processes,materials and equipment,but also to improve the process development efficiency of existing personnel,so that the new process can be quickly popularized and applied.Taking ZL101 alloy as the research object,the ZL101 alloy under different centrifugal conditions was studied by numerical simulation,and the microstructure,density defect and thermal conductivity of the sample under different centrifugal conditions were analyzed.The experimental results show that:(1)When the centrifugal rate is lower than 0-200 r/min,the grain size of ZL101 aluminum alloy is relatively coarse,the average size is about 37?m,and there are continuous sheets of shrinkage in the alloy,the eutectic structure presents a large plate shape;with the increase of centrifugal rate(350-500r/min),the grain is obviously refined,the average size is about 14.5?m,the shrinkage volume decreases obviously,and the eutectic silicon is dispersed along the grain boundary.Considering synthetically,the optimum centrifugal rate of the comprehensive performance of the specimen is about 350 r/min.(2)After comparing the simulated results with the experimental results,it is found that the results are similar in terms of grain size,density and defects.ProCast 2018 simulation accuracy is more accurate.(3)The thermal conductivity of ZL101 aluminum alloy samples is best in the range of centrifugal rate(100-200 r/min)and centrifugal radius(88-97mm).At the centrifugal rate(350-500 r/min),the thermal conductivity is reduced by grain refinement,indicating that the effect of grain structure size on thermal conductivity is far greater than that of other factors.