발간논문

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Vol.28, No.9, 818 ~ 825, 1990
Title
A Study on the continuous Low Cycle Fatigue Properties of 1 % Cr - Mo - V Steel and 12% Cr - Mo - V Steel Used in Turbine rotors
이수찬Soo Chan Lee, 남수우Soo Woo Nam
Abstract
Continuous low cycle fatigue properties of 1%Cr-Mo-V steel and 12%Cr-Mo-V steel used in turbine rotors were investigated at 298, 773 and 873K in air atmosphere. The microstructure of 1%Cr-Mo-V steel and 12%Cr-Mo-V steel consisted of tempered upper bainite and tempered martensite, respectively. The experimental results show that the effect of the directionality of rotor on the fatigue life was rarely observed. The fatigue life of 1%Cr-Mo-V steel is significantly reduced at high temperature with decreasing plastic strain range, and the reason is considered to be the earlier crack initiation by oxidation damage. However, the effect of temperature on the fatigue life of 12%Cr-Mo-V steel is known to be not existing throughout all the plastic strain range. This is suggested to be concerned with the increasing plastic ductility in tensile test with increasing test temperatures.
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