Thermal Mechanical Cyclic Plastic Bebavior of GH33A Supperalloy

The cyclic plastical bebavior of GH33A supperalloy is investigated under the condition of simultaneous cycle of temperature and mechanical strain. Influance of phase difference of alternating temperature and mechanical strain(in-phase and out-of-phase) on cyclic softening or cyclic hardening and thermal mechanical fatigue life is studied. The experimental results show that the damage in in-phase thermal machanical fatigue is more serious than that in out-of-phase at 570~825℃.And, the material is serious cyclic softening at high temperature side and first cyclic hardening, then cyclic softening at low temperature side for both in-phase and out-of-phase in thermal mechanical fatigue.