Effect of Sr Modifier on Microstructure and Mechanical Properties of ZL102 Casting Suspension Clamp

Abstract

In this thesis, the microstructure and mechanical properties of the suspension clamp made of ZL102 material modified with different amounts of Sr added are studied, and the grip strength and damage load of the suspension clamp as well as the tensile testing properties at room temperature, hardness and impact toughness of the material are tested. The results show that with the increase of Sr addition, α solid solution gradually changes into dendrite, while coarse strip eutectic silicon and bulk primary crystal silicon gradually change into granular and short-rod shapes. With the addition of Sr modifier, the tensile strength, elongation, expansion and impact toughness of ZL102 material increased significantly, and the hardness value decreased slightly but with a smaller range. The grip strength test of suspension clamp modified with different added amounts of Sr meets the standard requirements, and the damage load test of suspension clamp modified without Sr does not meet the requirements. When the added amount of Sr is 0.0250%, the type test index of suspension clamp is stable and dispersive.