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전기비저항을 이용한 35Cr-45Ni 강의 열화도 평가
박종서(Jong Seo Park),백운봉(Un Bong Baek),김정민(Jeong Min Kim),남승훈(Seung Hoon Nahm),한상인(Sang In Han),최송천(Song Cheon Choi) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.8
Since the used materials of furnace tube with different kinds of thermal degradation were not commonly available, the 35Cr-45Ni steel specimens were heat-treated isothermally at elevated temperature to simulate the microstructure at the service temperature. 35Cr-45Ni steel specimens with six different aging time were prepared by isothermal heat treatment at 1230℃. Electrical resistivity has been investigated for the degradation evaluation of 35Cr-45Ni steel. The variation of electrical resistivity was compared with the variation of tensile properties and Vickers hardness. To investigate the effect of the microstructural change on the characteristic of tensile properties, hardness and electrical resistivity, the microstructure were examined by optical microscope. Consequently, a nondestructive method to evaluate the toughness of aged rotor was established based on the measurement of electrical resistivity.