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      저자 : Saeid Rezanezhad (검색결과 1 건)
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        Influence of Heat Treatment on High-Cycle Fatigue and Fracture Behaviors of Piston Aluminum Alloy Under Fully-Reversed Cyclic Bending

        Saeid Rezanezhad,Mohammad Azadi,Mahboobeh Azadi 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5

        In the present article, the influence of the heat treatment on high-cycle fatigue and fracture behaviors of piston aluminum–silicon alloys was studied. For this objective, standard samples were tested under fully-reversed cyclic bending by a rotaryfatigue machine and then, fracture behaviors were investigated by the field emission scanning electron microscopy. Beforeexperiments, two heat treatments were performed on as-cast aluminum specimens, including a cooling process on samplesafter casting and the T6 treatment (solutioning for 5 h at 500 °C, quenching and ageing for 9 h at 180 °C). Obtained resultsshowed that the heat treatment changed the distribution and the size and of silicon phases in the aluminum matrix andincreased the hardness, significantly. In addition, the high-cycle fatigue lifetime increased by the heat treatment, surprisinglyas 2146% and 411%, at the highest stress level and the lowest stress level, respectively. This enhancement was more thanthe improvement by cooling samples after casting. Observing cleavage and quasi-cleavage marks on the specimen fracturesurfaces was the reason for the brittle fracture behavior. Besides, cleavage planes were smaller in heat treated samples, withshorter micro-cracks or lower crack densities, which affected the fatigue lifetime of the material.

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