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유동석(Dong-Suk You),권택용(Tack-Yong Kwon) 산업기술교육훈련학회 2009 산업기술연구논문지 (JITR) Vol.14 No.1
To study the tribology studied on the tribological characteristics of surface modification with hard coating materials anti-wear properties by PECVD(Plasma Enhanced Chemical Vapor Deposition) coating methods, an experimental process. An experimental process was established to determine the tribological characteristics of friction and wear behavior under the variation of applied, temperature and the time by the Falex test machine. The experimental results indicate that TiN coatings compared with TiC coatings on the materials have the excellent friction and wear characteristics. However TiC coatings compared with TiN coatings have a low friction coefficeint with steel and good thermal stability, and that Ti(C,N) is excellent the anti-wear property, superiority of extreme pressure property. And compound coatings compared with simple coatings show a improved tribological characteristics.
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최병기,권택용,정환규 朝鮮大學校 機械技術硏究所 2000 機械技術硏究 Vol.3 No.1
SS41 is welded automatically and is investigated some effects of the welding residual stress in the growth and propagation of fatigue crack, so as to study the fatigue behaviour in the welding residual stress field. The summarized results are as follows; 1) In case of the load range is constant, as the stress ratio is changing to 0.1, 0.33 and 0.5 the propagation life is constant but the growth life decreases. And than, when maximum load or minimum load is constant, as the stress ratio increases the growth life and propagation life. 2) It was shown that the fatigue crack propagation ratio da/dN was almost constant regardless of the stress ratio change at constant load amplitude and that the larger stress ratio, the slower was the fatigue crack propagation ratio. 3) The opening ratio U is influenced by Kmax but it isn't only the function of Kmax because data range is very large. 4) The growing and propagation fatigue crack in the welding residual stress field is similar to original specimen after passing the original residual stress field.
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최병기,권택용 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-
It is generally applied constraint welding condition to structure manufacture in the industry field. But it is thinkable that the residual stress of the construction and specimens for experiment is different because not constraint welding but non-constraint welding are applied for experiment. To apply the constraint welding condition as the industry field and compare and evaluate the welding residual stress distribution, the TIG welding of the pure titanium was carried out under constraint and non-constraint welding conditions
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최병기,최병희,권택용 朝鮮大學校 機械技術硏究所 2004 機械技術硏究 Vol.7 No.2
Effects of Nb(Niobium) contents and solution annealing on the strength and fatigue life of 18%Ni maraging steel commonly using in aircraft. space field, nuclear energy, and vehicle etc. were investigated. Also the fatigue life stress intensity factor were compared experiment result. The more Nb content, the higher or the lower fatigue life on base metal specimens or solution annealed specimens showing that the fatigue life was almost the same. The maximum stresses of X, Y, and Z axis direction showed about 2.12x10²MPa, 4.40x10²MPa and 1.32x10²MPa respectively. The Y direction stress showed the highest because of the same direction as the loading direction. The fatigue lives showed about 7% lower FEA result than experiment result showing almost invariable error every analyzed cycle. Stress intensity factor of the FEA result was lower about 3.5~10% than that of the experiment result showing that the longer fatigue crack length, the higher error. It considered that the cause for the difference was the modeled crack tip having always the same shape and condition regardless of the crack growth.
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국중민,임언택,권택용,최병기 朝鮮大學校 機械技術硏究所 1998 機械技術硏究 Vol.1 No.1
본 논문은 서로 다른 재료를 표면활성화법을 이용하여 저온에서 접합할 목적으로 이들 재료의 접합 가능성을 검토하고 이들 접합계면에서의 접합 메카니즘을 검토할 목적으로 연구하였으며 연구 결과는 다음과 같다. 1) 10-7 Torr대의 진공도에서도 알루미늄은 알루미나, 질화 알루미늄, 질화규소, 지르코늄 등의 세라믹스와 양호한 접합이 가능하였다. 2) 알루미늄, 동, 은은 같은 금속끼리의 접합이 가능하고, 또 알루미늄과 동의 이종재료의 접합도 가능하였다. 3) 실리콘은 알루미늄, 동, 은, 금 등의 실험결과 모든 금속과 접합이 가능하였다. In this paper considered it possible to bone different materials in low temperature using surface activated method. To do so, It was examined the possibility of bonding different materials and applied the bonding mechanism on the bonding surface. The followings are the result. 1) It was possible that Aluminum could be bonded well with ceramics such as alumina, nitrification aluminum, nitrification silicon, and zirconium at the vaccum level of 10-7 Torr. 2) It was possible that aluminum, copper, and copper could be bonded with each other and aluminum and copper could be bonded with other metals. 3) Silicon was bonded with aluminum copper silver, and gold which were tested before.
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최병기,국중민,장경천,권택용 朝鮮大學校 機械技術硏究所 2001 機械技術硏究 Vol.4 No.1
본 연구에서는 원자력 발전소의 터빈장치에 사용되는 순수티타늄 용접재의 피로수명과 크랙성장속도 등을 열영향부, 용접부 그리고 모재부를 각각 비교하기 위하여 시험편을 크게 용접된 4개의 시험편(Specimen1∼4 ; 초기노치에서 2∼3mm 떨어진 부분이 각각 H.A.Z, 본드부, 용접부, 모재부 등에 위치함)과 모재 시험편으로 나누어 피로시험을 수행한 결과 다음과 같은 결론을 얻을 수 있었다. 1) 순수티타늄 용접재 중 Specimen-2가 모재 시험편에 비해 피로수명이 약 700%로 가장 크게 나타났다. 2) 초기 크랙이 1mm로 성장하는데 걸리는 평균 크랙진전속도를 조사한 결과 Specimen-2가 모재에 비하여 약 30배로 가장 낮은 크랙진전속도를 나타내고 있었으며, 초기 크랙진전속도가 최종 파단 수명에 매우 큰 영향을 미치고 있음을 알 수 있었다. 3) 시험편 중 피로수명이 가장 큰 Specimen-2 시험편은 노치 선단으로부터 H.A.Z까지 거리가 약 6.7mm로 전체 파단길이의 약 25%를 차지하고 있었다. 4) da/dN과 ΔK를 고찰한 결과 용접으로 인해 생긴 두 개의 기울기로 인하여 Paris 법칙에 적용하기에는 부적당함을 알 수 있었다. In this study, Specimens were classified four welded specimens and a base metal to investigate fatigue life and crack growth rate of pure titanium welding materials, and Ti was used in turbine equipment of nuclear power generation, etc. The summarized results are as follows ; 1) Specimen-2 was bigger 712% than base metal, when it was compared with other welding materials. 2) As the result of specimens data. Specimen-2 crack Behavior rate was lower 30 times than base metal, and so total fracture life was very influenced by it 3) Notch tip of Specimen-2 was offsetted 6.7mm from boundary H.A.Z, and it formed 25% in total fracture length. 4) As the considering of da/dN and ΔK, Paris' law is incongruous in this study, because two inclines were on one date.
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