Influence of Structure of Tensile Test Rod Mold on Microstructure of Cast Aluminum Alloys
The tensile test rods poured with existing national standard aluminum alloy casting dies have the defects such as slag inclusion,porosity,shrinkage,cold partition,etc.Which fail to reasonably reflect the real mechanical properties of alloys.In this paper,the influences of the inclination angle of the straight runner and the position of the connection between the inner runner and the slag collecting cavity on the alloy structure are scientifically investigated using the principles of fluid kinematics and Heat Transfer Theory,on the basis of which a casting die for aluminum alloy tensile test rods is developed with ANSYS software.The simulation results show that when the inclination angle of the straight runner is 70°,the fluctuation range of fluid flow rate is minimal and that when the connection between the inner runner and the slag collection chamber is at the core of the slag collecting chamber,the best slag filtration effect is achieved.The results of pouring experiments show that the average grain size and dendrite spacing of ZL205A and ZL101 test bars formed by this die are better than those of GB/T1173-2013 dies.It is concluded that reasonable control of flow rate(inclination angle of the straight runner)and sound design of the height of the slag collection chamber are conducive to the molding of high-quality castings.
aluminium alloytensile test rodcasting diemetallographic organization
万方数据
维普
