During hot forging operations, dies are subjected to severe thermo-mechanical conditions. The die surfaces and the nearest surface layers of the die material undergo mechanical and thermal cycles which deeply influence their thermo-mechanical fatigue life. Moreover the holding time at high temperatures induces creep phenomena. Starting from damage evolution laws for pure creep and pure thermo-mechanical fatigue, the paper discusses a new lifetime prediction model able to take into account the effects of the interaction between creep and thermo-mechanical fatigue damages.
Creep-fatigue damage modelling of H11 hot working die steel
BERTI, GUIDO;
2006
Abstract
During hot forging operations, dies are subjected to severe thermo-mechanical conditions. The die surfaces and the nearest surface layers of the die material undergo mechanical and thermal cycles which deeply influence their thermo-mechanical fatigue life. Moreover the holding time at high temperatures induces creep phenomena. Starting from damage evolution laws for pure creep and pure thermo-mechanical fatigue, the paper discusses a new lifetime prediction model able to take into account the effects of the interaction between creep and thermo-mechanical fatigue damages.
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