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초음파 나노 표면개질 기술의 정하중 레벨이 SKD61 강의 피로특성에 미치는 영향
서창민(CHANGMIN SUH),김성환(SUNG-HWAN KIM) 한국해양공학회 2008 韓國海洋工學會誌 Vol.22 No.2
Ultrasonic nanocrystal suiface modification (UNSM) is a method to induce severe plastic deformation to a material surface, so that the structure of the material surface becomes a nanocrystal structure from the sufface to a certain depth. It improves the mechanical praperties, namely hardness, compressive residual stress, and fatigue characteristics. Specimens of SKD61 were tested to verify the effects of the variation of UNSM static load level on fatigue characteristics. The results were as follows: the grain size of SKD61 treated with UNSM became very fine from the material surface to a 100㎛ depth. The suiface hardness of SKD61 was increased up to 37% after UNSM And fatigue strength at 10? cycles was increased by 8.3, 11.2, and 17.9% respectively, when the static load levels of UNSM were 4, 6, 8 kgf.
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설계 및 생산기술의 혁신을 위해 필요한 나노표면개질기술
편영식(Youngsik Pyoun),서창민(Changmin Suh),조인호(Inho Cho),김창식(Changsik Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Improving energy efficiency, reducing CO₂ emission, improving durability and reliability, and reduction of total life cost of machine systems and components are main goals of recent design and manufacturing technology in academic and industrial society. All the failure in fatigue of torsion, bending and rolling contact, and in sliding wear and stress corrosion crack begins mostly from surface and grows into subsurface. So much efforts have been invested to the surface technology which deal these problems during past decades, but the industrial demand keeps growing and more significant requirements are added to researchers and engineers. Nano crystal surface modification technology which makes the surface layers into nano crystalline, induces big and deep compressive residual stress, increases surface hardness, improves surface hardness, and make micro dimples structure on surface is an emerging technology which can break limits of current surface technology and relieve the researchers and engineers burden. In this study, a nano crystal surface modification technology which is calling UNSM(Ultrasonic nano crystal surface modification) technology, is introduced and how it has been applied to industry to solve these failure problems is explained with typical examples. The UNSM technology can be utilized to innovate the design and manufacturing technology.
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편영식(Youngsik Pyoun),박정현(Jeonghyeon Park),조인호(Inho Cho),김창식(Changsik Kim),서창민(Changmin Suh) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.3
All the failure in fatigue of torsion, bending and rolling contact, and in sliding wear begins mostly from surface. So much efforts have been invested to the surface technology which deal these problems during past decades, but the industrial demand keeps growing and more significant requirements are added to researchers and engineers. Nano crystal surface modification technology which makes the surface layers into nano crystalline, induces big and deep compressive residual stress, increases surface hardness, improves surface hardness, and make micro dimples structure on surface is an emerging technology which can break limits of current surface technology and relieve the burden of researchers and engineers. In this study, a nano crystal surface modification technology which is calling UNSM(Ultrasonic nano crystal surface modification) technology, is introduced and how it has been applied to industry to solve these failure problems is explained.
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