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논문 기본 정보

저자정보
(한국해양대학교) (한국해양대학교)
저널정보
한국기계가공학회 한국기계가공학회지 한국기계가공학회지 제22권 제3호
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    초록·키워드

    This study aims to investigate the influence of ultrasonic nanocrystal surface modification (UNSM) on the hardness and roughness of high-manganese steel (HMS) produced through directed energy deposition (DED). HMS is known for its exceptional work-hardening and impact toughness, as well as its superior wear resistance. Three types of deposited HMS (13Mn, 18.5Mn, and 24Mn) were treated with UNSM, which was applied using a CNC machining process. The study sought to analyze the changes in the surface properties of the deposited HMSs according to two primary UNSM parameters: load and inter-pass interval. The results indicated that the surface hardness of the deposited HMSs improved as the inter-pass interval decreased and the static load increased. Notably, all deposited HMSs exhibited a severe plastic deformation (SPD) layer of approximately 250 ㎛ near the top surface after UNSM treatment. Conversely, the surface roughness improvement slightly decreased as the inter-pass interval decreased and the load increased, irrespective of the manganese content.

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