In order to establish the method of X-ray stress measurement at high temperatures for titanium (Ti), the stress on the Ti surface of Ti clad stainless steels having various thickness ratio of Ti to stainless steel was measured at R.T.-500°C by using CoKα radiation and {11·4} plane.
The results obtained are as follows:
(1) The temperature dependences of Bragg's angle for Ti in the state of no strain “2θ0” and X-ray stress coefficient “K value” were expressed well by using experimental functions.
(2) The measured stress was considered reasonable because of close agreement between the measured and the calculated values.
(3) The thermal stress was determined only by the thickness ratio of Ti to stainless steel.
(4) The reason for the loop of thermal stress is that the yielding of Ti occurs at high temperature during the heating process but appears at low temperature during the cooling process.
