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질소이온 주입에 의한 STD 11강의 내마모 특성변화에 관한 연구
한전건,송건,박진영,Han, Jeon G.,Song, Keun,Park, Jin Y. 한국진공학회 1994 Applied Science and Convergence Technology Vol.3 No.4
산업용 주요 냉간금형 소재인 STD 11 강에 질소이온주입하여 이온조입조거에 따른 질화물형성 거동, 경도 및 내마모성 변화에 관해 연구하였다. XRD분석결과 90keV 에너지로 5$\times$1017 ions/cm2 조사 량 이상에서 Fe2N형태의 질화물이 형성되었으며 3$\times$1016 ions/cm2 범위의 모든 조사량에서 경도 및 조 사량에서 경도 및 내마모성 향상효과를 얻었다. Al2O3와의 ball-on-disc 마모거동 분석결과 STD 11모재 는 응착마모와 산화마모의 혼합형태로 마모되는 반면 질소이온주입한 경우 산화마모 경향이 강하게 나 타났다.
마찰교반 점용접한 A 5052 알루미늄 합금판재의 접합부 특성
연윤모,이원배,이창용,정승부,송건,Yeon, Yun-Mo,Lee, Won-Bae,Lee, Chang-Yong,Jung, Seung-Boo,Song, Keun 대한용접접합학회 2006 대한용접·접합학회지 Vol.24 No.1
In this study, the microstructure and mechanical properties of spot friction stir welded A 5052 alloy were investigated. Especially, the effect of insertion depth of welding tool on microstructural changes and mechanical properties was investigated in order to obtain the optimum spot friction stir welding condition. The lap shear load of spot friction stir welded A 5052 alloy plates showed lower value at the shallowest insertion depth and increased with tool insertion depth. At 1.6mm, the maximum value of 3.35 kN was obtained, and then dropped to lower load when the insertion depth was deeper. Spot friction stir welded joints showed shear fracture mode at shallower insertion depths and fracture mode changed to plug fracture mode as the insertion depth was deeper.
홍영환 ( Young Hwan Hong ),송건 ( Keun Song ) 한국열처리공학회 2003 熱處理工學會誌 Vol.16 No.3
N/A Effects of cryogenic treatment and tempering temperature on the amount of retained austenite, hardness and wear properties has been investigated using alloy tool steel, STD 11. Cryogenic treatments were performed at the temperatures of -100℃, -150℃ and -196℃, and tempering were performed at 200℃ and 530℃. It was shown that lower hardness value was obtained on high temperature (530℃) tempering even after cryogenic treatment. And retained austenite was not entirely transformed to martensite after cryogenic treatment even at -196℃, which was not consistent with the belief that -80℃ was sufficient to entirely transform any austenite retained in the quenched microstructure. Austenite retained in cryogenic treated condition was completely transformed to martensite only after tempering at 530℃. As far as wear test conditions in this investigation, it was found that cryogenic treatments improved the sliding wear resistance, but improvement of wear resistance was not directly related with retained austenite contents. And it was found that predominent wear mechanisms of STD11 steel were oxidation wear and adhesive wear in sliding wear conditions.
Electroforming을 이용하여 제조한 Ni 기판의 기계적 특성 및 내마모 거동 분석
이승이,장석헌,이창민,최준혁,주진호,임준형,정승부,송건,Lee, Seung-Yi,Jang, Seok-Hern,Lee, Chang-Min,Choi, Jun-Hyuk,Joo, Jin-Ho,Lim, Jun-Hyung,Jung, Seung-Boo,Song, Keun 한국재료학회 2007 한국재료학회지 Vol.17 No.10
We fabricated the Ni plate by electroforming process and evaluated the microstructure, mechanical properties and wear behavior of the Ni plate. Specifically, the effects of addition of wetting agents, SF 1 and SF 2 solutions, on the microstructure and properties were investigated. The microstructure and surface morphology were characterized by transmission electron microscopy (TEM) and atomic force microscopy (AFM), respectively, and friction coefficient was measured by the ball-on-disk method. We found that the microstructure and mechanical properties of Ni plate were changed with kind and amount of wetting agents used. The hardness and tensile strength of Ni plate formed without wetting agents was 228 Hv and 660.7 MPa, respectively, whiled when wetting agent was added, those were improved to be 739 Hv and 1286.3 MPa. These improvements were probably due to the finer grain size and less crystallization of Ni. In addition, when both wetting agents were added, the friction coefficient was reduced from 0.73 to 0.67 which is partially caused by the improved hardness and smooth surface.