HIGH-TEMPERATURE BEHAVIOR OF IN-738-LC UNDER ISOTHERMAL AND THERMOMECHANICAL CYCLIC LOADING

The temperature dependence of the cyclic behavior of IN 738 LC was stu died. Cyclic iso- and non-isothermal tests were performed with proport ional and non-proportional tension/torsion strain paths. It was shown that maximum and minimum stress values measured in isothermal strain c ontrolled tests correspond quite well with results of non-isothermal t ests. Thermal-mechanical constitutive equations based on the viscoplas tic Chaboche model were used to describe the non-isothermal stress-str ain behavior. (C) 1997 Elsevier Science S.A.