抄録
A position-sensitive proportional counter suitable for the X-ray stress analysis has been developed and residual stress in austenite steel was measured with an apparatus which uses this PSPC system.
The detector was designed to have a good angular resolution overall the counter length for diffracted X-ray beams and a high counting rate. The mean angular resolution measured was about 0.2° in 2θ (FWHM), and the maximum allowable counting rate reached about 40000cps. The time required for the data accumulation was shortened to about one-tenth of that of the conventional counter method.
It is generally said that the X-ray stress measurement of austenite steel should be performed on its γFe(311) diffraction plane by using Cr-Kβ radiation and the measurement on γFe(220) should be avoided because the strain sensitivity on γFe(220) diffraction plane is less than that on γFe(311) one. However, the precision of stress determined on γFe(220) was better than that on γFe(311), if Bragg's angles were measured at many ψ angles.
