Changes in the Macrostresses and Microstresses in Steel with Fatigue
NORTHWESTERN UNIV EVANSTON IL DEPT OF MATERIALS SCIENCE
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The residual stresses in both the ferrite and cementite phases of fatigued 1080 steel specimens with pearlite, spheroidite, and tempered martensite microstructures were measured with x-ray diffraction giving both the macrostresses and the microstresses. Specimens with no initial stresses showed little changes with fatigue. Specimens with initial macrostresses and with initial microstresses showed fading of the stresses, the fading being the slowest for the strongest microstructure. Hydrostatic microstresses are present after heat treatment due to the differential thermal properties of the cementite and ferrite.
- Metallurgy and Metallography