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pISSN : 1598-706X / eISSN : 2288-8381


(논문)연구논문

한국주조공학회지 (9권4호 336-344)

The Effect of Diameter of Casting on the Matrix Structure, Mechanical Properties and Propagation of Ultrasonic Wave in Eutectic CV Graphite Cast Iron.

공정 CV흑연주철의 주물의 직경이 기지조직, 기계적 성질 및 초음파전도속도에 미치는 영향.

Hyo-Joon Kim, Sang-Ik Lee

Hanyang university

Abstract

The matrix structure and the morphology of CV graphite are affected by the addition of many kinds of elements, which are contained in the CV graphite cast iron, additives, fading time and cooling rate. The effects of cooling rate on the matrix structure, the shape of CV graphite, mechanical properties and propagation of ultrasonic wave in eutectic CV graphite cast iron were studied. When the diameters of the samples are 50mm, 35mm and 20mm 1. CV graphite number showed average 13.8% increase and CV graphite length showed 12.3% decrease with decreasing diameter of the samples. 2. The amount of graphite and ferrite showed average 10.6, 4.3% decrease and the amount of pearlite showed average 23.4% increase. 3. Hardness and tensile strength showed average 3.2%, 9.5% increase and impact strength showed average 1.3% decrease. 4. Ultrasonic wave velocity showed average 1.1% increase.

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