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Journal of KWJS 2006;24(3):49-54.
Published online August 22, 2006.
Ni 계 초내열합금의 PTA 오버레이 층 특성에 관한 연구
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A Study on the Characteristics of the Ni base Super Alloy Overlay Layer by Plasma Transferred Arc (PTA) Method
Young-Sik Kim, Young-Goog Choi, Kwang-Ryeol Lee
Abstract
  The Plasma Transferred Arc (PTA) overlaying method is lately introduced as one of the most useful surface modification method of the engine component. In this paper, the characteristics of the Co-base and Ni-base super alloy overlay layers by PTA method were investigated through the metallurgical, abrasive and cavitation erosion test.   Experimental results showed that the abrasive wear resistance of the Co-base Stellite 6 overlayer was the most superior and followed in order of Nimonic 80A, Inconel 625 and Inconel 718. However, the cavitation erosion characteristic of the Stellite 6 overlayer was the most inferior and it was better in order of Inconel 625, Inconel 718 and Nimonic 80A.
Key Words: PTA, Ni-base super alloy, Overlay layer, Abrasion test, Cavitation erosion test


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