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김우중(Woo-Jung Kim),김재훈(Jae-Hoon Kim),장중철(Jung-Cheol Jang),김범수(Beom-Soo Kim),유근봉(Keun-Bong Yoo) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The Heat Recovery Steam Generator(HRSG) is device that uses exhaust gas of gas turbine to increase thermal efficiency. In order to requirements global needs saving energy, reducing emission of CO2, reducing cost, many power plant appled HRSG. Generally, High Cr steels are used in steam side tube because of its high temperature strength and oxidation resistance. This paper addresses creep-rupture test of 9Cr-1Mo steel at isothermal temperature with change thermal and stress condition. the results of date are plotting to Larson-Miller parameter. Through hardness test of specimens, fluctuation of hardness values are determined to interrelation between hardness and life. Finally, The test specimen of creep rupture is observed by Transmission Electron Microscope(TEM) to analyze higt temperature material behavior of Cr steels
IN738LC 합금의 열간 노출 및 재생 열처리에 따른 미세조직과 응력 파단 특성의 변화
최백규,주동원,김인수,장중철,조창용,Choe, Baek-Gyu,Ju, Dong-Won,Kim, In-Su,Jang, Jung-Cheol,Jo, Chang-Yong 한국재료학회 2001 한국재료학회지 Vol.11 No.10
Effects of thermal exposure and rejuvenation treatment on the microstructural evolution and the stress-rupture properties of IN738LC have been investigated. The role of precipitates on the stress- rupture properties has been analyzed through microstructural observations. Thermal exposure at $982^{\circ}C$ for 1000 hours gave rise to precipitation of $\sigma$ phase and coarsening of ${\gamma}$'. The microstructural degradation with thermal exposure at $982^{\circ}C$ deteriorated stress rupture properties of the alloy. All the existing phases except MC carbides have completely dissolved into the matrix with homogenization treatment at $1200^{\circ}C$ for 2 hours. Microstructure and stress-rupture properties of the thermal exposed specimens have been successfully rejuvenated by the proposed treatment.
IN738LC 합금의 열간 노출 및 재생 열처리에 따른 미세조직과 응력 파단 특성의 변화
최백규,주동원,김인수,장중철,조창용,Choe, Baek-Gyu,Ju, Dong-Won,Kim, In-Su,Jang, Jung-Cheol,Jo, Chang-Yong 한국재료학회 2001 한국재료학회지 Vol.11 No.11
Effects of thermal exposure and rejuvenation treatment on the microstructural evolution and the stress-rupture properties of IN738LC have been investigated. The role of precipitates on the stress-rupture properties has been analyzed through microstructural observations. Thermal exposure at $982^{\circ}C$ for 1000 hours gave rise to precipitation of $\sigma$ phase and coarsening of r'. The microstructural degradation with thermal exposure at $982^{\circ}C$ deteriorated stress rupture properties of the alloy. All the existing phases except MC carbides have completely dissolved into the matrix with homogenization treatment at $1200^{\circ}C$ for 2 hours. Microstructure and stress-rupture properties of the thermal exposed specimens have been successfully rejuvenated by the proposed treatment.
김우중 ( Woo Joong Kim ),김재훈 ( Jae Hoon Ki ),장중철 ( Jung Cheol Jang ),김범수 ( Beom Soo Kim ),이기천 ( Gi Chun Lee ) 한국안전학회(구 한국산업안전학회) 2013 한국안전학회지 Vol.28 No.3
The Heat Recovery Steam Generator (HRSG) is a device recycling the exhaust gas of gas turbine in combined power and chemical plants. Since service temperatures was very high, the damage of HRSG tubes intensively occurred in superheater and reheater. The aim of this paper is to determine life and hardness relationship that addresses creep-rupture test and creep-interrupt test in modified 9Cr-1Mo steel. The measured life that consists of function of hardness was found to constant tendency.