Solidification Forming Design for ZL114A Heteromorphic Missile Shell
ZL114A heteromorphic missile shell was manufactured at 715℃ by low-pressure filling with filling and solidification time of 4.79 s and 1 615 s,achieving a smooth top-down filling with a top-down and inside-outside solidi-fication sequence.The results indicate that as-cast structure is mostly composed of α-Al matrix,α-Al+Si eutectic,Mg2Si phase,and Al3Ti phase,and average grain size of shell in the top,middle,and bottom regions are 116.09,147.76,and 178.33 μm,respectively.The mean values of tensile strength,yield strength,elongation and elasticity modulus are 344.66 MPa,275 MPa,8.44%,and 71.5 GPa,and dispersion coefficients are 0.55%,0.93%,3.5%and 0.7%,respectively.The mechanical properties are declined progressively from top to bottom along the height of the missile shell,and tensile strength,yield strength,elongation,and elasticity modulus in top region are 364 MPa,284 MPa,9.2%,and 71.5 GPa,respectively.The morphology of as-cast Si phase is transformed from slatted and blocky shape to a roughly spherical shape after aging heat treatment,with large amounts of residual dimples on the frac-ture surface,and fracture mechanism is characterized by dimple fracture.
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