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The effect of the microstructure on the fatigue strength of A356 alloy castings with a surface refined through rapid crystallization has been investigated. The refinement of the structure, in order to improve the fatigue strength of the alloy surface, was accomplished with an electric arc plasma. The surface fusions were made in helium atmosphere by changing the welding current intensity from 100 to 300 A and the arc advance speed from 200 to 600 mm/min. The rapid crystallization reduced the parameters  1  and  2  of the  phase dendrites and  E  of the eutectic, compared to the initial material. The parameter  E  changed by a factor of nearly 3. The structural refinement was determined by the amount of heat input into the fusion area. The fatigue strength increased with decreasing values of the λ parameters of the structure.

Microstructure and fatigue strength of A356 alloy castings refined on the surface by rapid crystallization