Effect of Ti,C,B Composite Particles on the Microstructure and Mechanical Properties of ZL205A Gear Chamber Castings
In this paper,a new type of Al-TCB master alloy is used to refine the grain of ZL205A gear chamber casting,and the effect of adding different Al-TCB master alloy on the microstructure and mechanical properties of gear chamber casting is studied.The results show that the addition of Al-TCB can obviously refine the microstructure of ZL205A alloy.When 1.0%Al-TCB is added,the grain size of the alloy is refined from 240 μm to about 60 μm,and the alloy has fine grains,uniform structure and high density.The Ti,C,B composite particles are heterogeneous nucleation particles grown by primary α-Al.With the increase of the addition of Al-TCB master alloy,the dimple area and the density of precipitated phase increase synchronously in the fracture morphology,and the effect of strengthening and toughening the alloy is remarkable.The microhardness,tensile strength and elongation of the sample reach HV143,502 MPa and 5.1%respectively.
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