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      저자 : 김엄기 ( Jung Ki Kim (검색결과 3 건)
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        미소 비커스경도에 의한 Cr-Mo-V강의 경년열화 평가

        김정기,남승훈,김엄기 ( Jung Ki Kim,Seong Hoon Nahm,Am Kee Kim ) 한국열처리공학회 1998 熱處理工學會誌 Vol.11 No.1

        Since Cr-Mo-V steel has excellent fracture and creep properties at elevated temperature, they are extensively used as steam turbine components such as the turbine rotor. However, the turbine rotor steel used to suffer material degradation during long term service. Therefore, the assessment of the safety and residual life of the turbine rotor is periodically required during service. One of the most convenient techniques for that is the hardness method mainly due to its simplicity and nondestructive characteristics. In this research, six specimens with different aging times of turbine rotor steel were artificially prepared by an isothermal heat treatment at 630℃. The micro Vickers hardnesses of specimens were measured at room temperature. The relationships between the fracture properties and the hardness ratio were investigated. And also an indirect method to evaluate the residual life of degraded turbine rotor was proposed based on the micro Vickers hardness measurement.

      • 미소 비커스경도에 의한 터빈로터강의 경년열화 평가

        김정기,김엄기 公州大學校工科大學生産技術硏究所 1997 論文集 Vol.5 No.-

        Since Cr-Mo-V steels have excellent fracture and creep properties at elevated temperature, they are extensively used as steam turbine components such as the turbine rotor. However, the turbine rotor steel used to suffer material degradation during long term service. Therefore, the assessment of the safety and residual life of the turbine rotor is periodically required during service. One of the most convenient techniques for that is the hardness method mainly due to its simplicity and nondestructive characteristics. In this research, six specimens with different aging times of turbine rotor steel were artificially prepared by an isothermal heat treatment at 630℃. The micro Vickers hardnesses of specimens were measured at room temperature. The relationships between the fracture properties and the hardness ratio were investigated. And also and indirect method to evaluate the residual life of degraded turbine rotor was proposed based on the micro Vickers hardness measurement.

      • Crack Tip Opening Displacement δ5 R-곡선과 δbs R-곡선의 비교연구

        이성호,진욱,김엄기,김정기 公州大學校工科大學生産技術硏究所 1998 論文集 Vol.6 No.-

        In this research, newly introduced δ?? parameter instead of conventional CTOD parameters and DC potential drop method were used in order to investigate CTOD R-curves. Long used boiler header steel(1Cr-0.5Mo), heat treated boiler header steel to mimic the new one. Al2024-T6 and Al2024-T351 were tested. Consequently δ?? and δ??(CTOD based on BS5762) R-Curves for those materials were compared.

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