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- W1904392862 abstract "With the rapid development of automotive industry,the requirements for engine performance has become increasingly higher and higher,such as dynamic performance,environmental performance,fuel economy performance and so on.Obviously,using lighter aluminum engine has become the future of the automobile industry.When start or stop the engine,the engine generates drastic temperature field that will make parts of the engine components into the plastic deformation zone.If the engine components continue like this,extremely high thermal strain will cause the thermal fatigue failure of aluminum alloy for automotive engine.Thermal fatigue is a more serious form of material fatigue failure.The thermal fatigue is prevalent in many important engine castings,such as cylinder body,cylinder head,piston and so on.Therefore,study on thermal fatigue properties of multivariate Al-Si-Cu cast alloy has the most important significance.Based on this thermal fatigue behaviors of multivariate Al-7.5Si-4Cu alloys under different heat treatment were investigated in the temperature ranges of room temperature to 350℃.The thermal fatigue cracks of the tested specimens were observed using OM and SEM.The results demonstrate that thermal fatigue properties of the alloy after T6 heat treatment is better than the alloy after cast-quenching+aging heat treatment and the cast alloy.Reasonable heat treatment process can improve the strength,the plasticity and the thermal fatigue property of multivariate Al-7.5Si-4Cu alloy,including reduce the rate of crack propagation. The main reason of crack initiation is oxidative microstructure induced by thermal stress.Fatigue crack expands along the grain boundary by passivation-sharpen of crack tip in the early.In the late,fatigue crack expands with both intergranular way and transgranular way by passivation-sharpen of crack tip and siamesed holes on front edge of crack tip.The Si phases can affect fatigue crack propagation.When the angle between the fatigue crack propagation and the short axis of the Si phase is more than 60°,fatigue crack expands asbypass-wall expansion.When the angle between the fatigue crack propagation and the long axis of the Si phase is more than 60°,fatigue crack expands asthrough-wall expansion.Oxidation behavior effects significantly at the crack initiation period.After T6 heat treatment,the antioxidant property of multivariate Al-7.5Si-4Cu alloy is the best.Oxidation kinetics curves of multivariate Al-7.5Si-4Cu alloy under the different heat treatment are all logarithmic relationship." @default.
- W1904392862 created "2016-06-24" @default.
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- W1904392862 date "2013-01-01" @default.
- W1904392862 modified "2023-09-27" @default.
- W1904392862 title "THERMAL FATIGUE CRACK INITIATION AND PROPAGATION OF MULTIELEMENT Al-7.5Si-4Cu ALLOY" @default.
- W1904392862 doi "https://doi.org/10.3724/sp.j.1037.2012.00484" @default.
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