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This study was conducted to evaluate thermal fatigue characteristics of various electron beam (EB)-irradiated surfaces. EB-irradiated surfaces treated by gas nitriding were evaluated for thermal fatigue by surface roughness measurement, microscopic observation and X-ray residual stress measurement. Result indicate that the residual stress of electron beam processing is more dominant than that of preprocessing and that the residual stress decreases in the early stages of thermal fatigue examination in electron beam processing. Moreover, it was detemined that the processing in which gas nitriding was carried out controlled crack formation during thermal fatigue examination.

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