ADC12合金ダイカストにおける欠陥が機械的性質におよぼす影響と鋳造CAEによる強度予測可能性

抄録

  Die casting products have various casting defects, thus product designs that allow for some degree of defects are carried out regardless of the presence or absence of actual defects. In order to optimally design products made of ADC 12 alloy, we examined the possibility of component strength prediction.

  First, we investigated the relationship between various defects and mechanical properties. The defects are roughly divided into oxides, gas porosities, and shrinkage. We investigated how these defects affect the deterioration of mechanical properties. Therefore, we obtained the relation between the tensile strength and defect area ratio by the SEM observation of the fracture surface after the tensile test.

  Among the observed defects, incomplete interfaces arising when the solid fraction was high at the completion of filling were found in oxide-based defects other than the entrainment of the oxidized film of molten aluminum and cold flakes.

  For incomplete interfaces, the occurrence was predicted from the solidification ratio of the flow analysis, while gas porosity was predicted from the gas entrapment amount and porosity amount calculation in casting CAE. We investigated the feasibility of predicting the strength of dictating parts using these methods.