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논문 기본 정보

자료유형
학술저널
저자정보
Jae-Yeon Kim (Seoul National University of Science and Technology) Woo-Sang Jung (Korea Institute of Science and Technology) Won-Sik Lee (Korea Institute of Industrial Technology) Jai-Won Byeon (Seoul National University of Science and Technology)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.22 No.4
발행연도
2016.1
수록면
694 - 699 (6page)

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초록· 키워드

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Cast In740 Ni-based alloy with large grains generally show remarkable high temperature strength. However, this alloy is still have insufficient surface microstructure-dependent properties. In this study, for improvement of surface properties, surface modification of a cast In740 Ni-based superalloy was successfully performed by friction stir processing using a conventional two-horsepower milling machine and by additional heating to facilitate plastic flow of the hard alloy. Without using a high-power heavy stirring machine, a notable reduction in grain size of 2.9 μm was achieved and a corresponding 30% increase in Vickers hardness was observed. The microstructure in the stir zone was analyzed in terms of the grain size and precipitate distribution. The result of the potential dynamic polarization test and in-situ acoustic emission monitoring show that electrochemical corrosion resistance was improved by this surface modification process.

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