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        고강도 ADI 의 기어부품 개발에 관한 연구

        김원용,김광배,강인찬,안상욱 ( Won Yong Kim,Kwang Bae Kim,In Chan Kang,Sang Uk An ) 한국주조공학회 1993 한국주조공학회지 Vol.13 No.2

        N/A In this study, it was examined the relationship between the microstructure, fatigue properties, mechanical properties and retained austenite volume of Mo-Ni ADI corresponding to various austempering temperatures. When the austempering temperature is increased to 370℃, aticular bainite structure was found to be transformed to feathery bainite structure. But at the austempering temperature of 420℃, the dissolved bainite lath was shown. Up to the austempering temperature of 370℃, the volume of retained austenite was increased. However at the austempering temperature of 420℃ a large amount of retained austenite was decreased. In this study, the retained austenite volume was determined by XRD(X-ray diffraction). It was observed that the optimum fatigue properties can be obtained at the condition of austempering temperature 370℃. Under the such conditions, fatigue limit determined as the value of 290㎫, tensile strength 877㎫ elongation 6%, hardness 285(BHN), impact values(CVN) 9.2J and retained austenite volume 30.3%, respectively.

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