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양호영(Ho-Young Yang),김재훈(Jae-Hoon Kim),유근봉(Keun-Bong Yoo),이한상(Han-Sang Lee),유영수(Young-Soo Yoo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The Ni-base super heat resisting alloy GTD-111 is employed in gas turbines because of its high temperature strength and oxidation resistance. The prediction of fatigue life for superalloy is important for improving the efficiency. In this study, low cycle fatigue tests are performed as variables of total strain range and temperature. The relations between strain energy density and number of cycles to failure are examined in order to predict the low cycle fatigue life of GTD-111 super alloy. The lives predicted by strain energy methods are found to coincide with experimental data and results obtained from the Coffin-Manson method.
오스테나이트계 스테인리스 SUS 304H 강의 열기계적 피로 특성
양호영(Ho-Young Yang),김재훈(Jae-Hoon Kim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
In power plants, austenite stainless steel are using as a superheater tube, reheater tube, boiler pipe, since they have a good corrosion resistance, mechanical property and oxidation resistance at high temperature. In this paper, a TMF(Thermal mechanical fatigue) test were carried out to observe thermal fatigue behavior and microstructure of 304H stainless steel which is mainly using a high temperature system of HRSG(heat recovery steam generator). The substructural changes of the starting microstructure were also found to be responsible for the reductino of the fatigue life. The tests specimens of TMF are observed by Scanning Electron Microscopy (SEM) to analyze material behaviro of SUS 304H.
고체윤활 graphite 소재의 마모 특성에 관한 연구
양호영(Ho-Young Yang),김재훈(Jaehoon Kim),하재석(Jaeseok Ha),김연욱(YeonWook Kim),박성한(Sunghan Park),이한규(Hankyu Lee) 한국추진공학회 2012 한국추진공학회 학술대회논문집 Vol.2012 No.11
고체윤활재는 기밀성, 내마멸성, 윤활막의 형성의 특성을 가지고 있다. 본 논문은 대표적인 고체윤활재 graphite 소재의 윤활막 형성 조건으로 하중조건에 따른 마모 특성 평가를 통하여 윤활막 생성 최적의 접촉응력을 고찰한다. 마모 과정동안의 마모 깊이의 변화를 통해, 마모 과정 동안 마멸입자의 생성, 윤활막의 생성, 윤활막의 소멸의 과정을 반복하는 마모 메커니즘을 고찰한다. For designing solid lubricating of seal, important design factors are tightness, wear resistance and lubricant films. In this paper, optimal stress for formation of a lubricant film was considered by evaluating wear properties of graphite materials. Also, procedures of formation of wear particles and a lubricant film, and dissipation of a lubricant film were considered with changes of wear depth while proceeding with wear.
코발트기 초내열합금 ECY768의 고온 저주기피로 거동
양호영 ( Ho Young Yang ),김재훈 ( Jae Hoon Kim ),하재석 ( Jae Suk Ha ),유근봉 ( Keun Bong Yoo ),이기천 ( Gi Chun Lee ) 한국안전학회(구 한국산업안전학회) 2013 한국안전학회지 Vol.28 No.3
The Co-base super heat resisting alloy ECY768 is employed in gas turbine because of its high temperature strength and oxidation resistance. The prediction of fatigue life for superalloy is important for improving the efficiency. In this paper, low fatigue test are performed as variables of total strain range and temperature. The relations between strain energy density and number of cycle to failure are examined in order to predict the low cycle fatigue life of ECY768 super alloy. The lives predicted by strain energy methods are found to coincide with experimental data and results obtained from the Coffin-Manson method. The fatigue lives is evaluated using predicted by Coffin-Manson method and strain energy methods is compared with the measured fatigue lives at different temperatures. The microstructure observing was performed for how affect able to low-cycle fatigue life by increasing the temperature.
양호영(Ho Young Yang),김재훈(Jae Hoon Kim),유근봉(Keun Bong Yoo),이한상(Han Sang Lee),유영수(Young Soo You) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.7
초내열합금인 GTD-111은 고온강도와 내산화성이 우수하여 가스터빈에서 사용되는 소재이다. 초내열합금의 피로 수명 예측은 가스터빈의 효율을 개선하기 위하여 매우 중요하다. 본 연구에서의 저주기 피로시험은 실제 운전 환경과 유사하게 변형률 범위, 온도를 다양하게 설정하여 시험을 수행하였다. GTD-111의 저주기 피로수명을 예측하기 위하여 변형률 에너지 밀도와 파단 사이클과의 관계를 이용하였다. 시험결과를 토대로 변형률 에너지법과 Coffin-Manson법에 의하여 피로수명을 예측하였다. The Ni-base super-heat-resistant alloy, GTD-111, is employed in gas turbines because of its high temperature strength and oxidation resistance. It is important to predict the fatigue life of this superalloy in order to improve the efficiency of gas turbines. In this study, low-cycle fatigue tests are performed as variables of total strain range and temperature. The relationship between the strain energy density and number of cycles to failure is examined in order to predict the low-cycle fatigue life of the GTD-111 superalloy. The fatigue life predicted by using the strain-energy methods is found to coincide with that obtained from the experimental data and from the Coffin-Manson method.
양호영(Ho-Young Yang),김재훈(Jaehoon Kim),하재석(Jaeseok Ha),김연욱(YeonWook Kim),박성한(Sunghan Park),이한규(Hankyu Lee) 한국추진공학회 2012 한국추진공학회 학술대회논문집 Vol.2012 No.11
Graphite는 고온/고압의 가스가 구동장치에 유입되지 않게 기밀 소재로 사용되며, 구조물 안에서 윤활과 기밀을 돕게 된다. 본 연구에서는 graphite의 고온마모 거동에 관한 연구로 고온 마모 특성을 평가하였다. 고밀도 graphite(HK-6)에 대하여 온도, 속도, 하중 조건에 따른 마모 특성을 평가 고찰하였다. 또한 기밀에 사용되는 graphite의 마모 특성을 통하여 최적화된 환경 조건에 대하여 제안 하였다. Using graphites is to assist lubricant and sealing and to prevent the high-temperature and high-pressure gas flow into the reciprocation devices. In this study, the physical property and the tribological characteristics of the graphite in high-temperature were evaluated. In order to evaluate the tribological characteristics of high density graphite(HK6), variables which are temperature, speed and load was used. Also, this study suggested proposed environmental conditions through the frictional properties of graphite used in high-temperature dynamic alright structures.