Research Progress of Microporosity Characteristics in Casting and Their Effects on Fatigue Life

Abstract

Microporosities in casting alloys cannot be avoided in the casting process, which reduces the fatigue life of structure greatly.The current progress of microprosity characteristics(size, shape and position)in casting alloys and their effects on fatigue life is reviewed and prospected, including the types of porosities, distribution rules of porosity characteristics, and prediction method of maximum porosity size and the fatigue life prediction method of castings containing porosities.Through reviewing the fatigue life prediction model, it is concluded that the current fatigue life prediction method of casting is not yet mature.The future research of this field is prospected.The future research should rely on advanced light sources to perform in-situ fatigue experiments or molecular dynamics simulations to study the microscopic mechanism of fatigue failure, and a quantitative prediction model for fatigue life considering different characteristics of porosities and the interaction between them should be established.

Keywords

• casting
• microporosity
• characteristics distribution rule
• size prediction
• fatigue life