Effect of Surface Modification by Fine Particle Bombardment on High-cycle Fatigue Strength of ADC12 Die-cast

Abstract

  Due to transcription of the die heat check and exposure of interior defects by machining, etc., there exist defects on the surface of die casting parts, which often act as the origin of fatigue failure. Fine particle bombardment (FPB) highly improved the 10⁷ cycles fatigue strength of ADC12 die-cast. In the FPB treated die-cast, a thin modified layer of about 5μm in depth was formed on the surface and filled the surface defects. Both the application of compressive residual stress in the surface regime and these surface modifications resulted in the higher fatigue strength.