X-ray Stress Measurement of Nickel-base Single Crystal Superalloy Using Two-dimensional Detector
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چکیده
The stress in a single crystal of nickel-base superalloy with 72 % volume fraction of '-phase was measured by the X-ray method. The specimen whose surface normal was parallel to [001] direction was oscillated around -axis during recording of the X-ray diffraction pattern with a two-dimensional position sensitive proportional counter (PSPC). The stress was determined from the measured strain using the multiple regression method and the two-tilt method. The uniaxial stress was applied along [100] direction and three stress components were measured with the X-ray methods. The stress along [100] direction, 11, measured with the X-ray method increased proportionally to the applied uniaxial stress, and the measured stress was about 5 % smaller than the applied stress. The other stress components, 22 and 12, did not change with the applied stress. Those two methods were applied to measure the machining residual stress of the specimen made for fatigue tests. The residual stress was a compression of about 700 MPa on the surface and quickly decreased to zero at about 15 m beneath the surface. The increase in the full-width at half maximum was observed within the depth of about 15m from the machined surface, corresponding to the depth of the compression zone.
منابع مشابه
Modelling of Thermomechanical Fatigue Stress Relaxation in a Single-Crystal Nickel-Base Superalloy
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تاریخ انتشار 2009