Computerized simulation of thermal behaviour during forging sequences
Journal de Physique IV : Proceedings
In the field of Hot Closed die forging by thermomechanical treatment of high sensibility m6tallurgical alloys, the fina; metallurgical structure depends directly of mechanical ( &,& . . ) and thermal (T .. ) variables. Recently, the possibility to couple the mechanical and the thermal behaviour in the computerized simulation of forging sequences makes stronger the predictiv aspect of such softwares. Some examples will show the importance of this combined point of view. Industrial applications
... ve very interesting results. They show also the necessity to modelize very accurately thermal exchanges by convection, conduction and radiation. COMPUTERIZED SIMULATION AND FORGING OF THERMOMECHANICAL ALLOYS : Generally speaking, all hot forming is thermomechanical processing. However this term is normally used only for specific applications when it is necessary to select and control explicitly deformation and thermal conditions during the process in order to obtain or improve mechanical properties on final products. In the field of FORTECH/AIRFORGE products we are more specifically concerned by titanium alloys and Nickel based Superalloys. A large part of these alloys are used for jet engines components and final mechanical properties are directly in correlation with the metallurgical microstructure. This one is a consequence of the thermomechanical history from the elaboration to the final forging sequence. As long as we are concerned by these types of applications, the aim of the forging manufacturer is to control final product properties by controling strain and thermal conditions at every stepduring forging process. Article published online by EDP Sciences and available at http://dx. JOURNAL DE PHYSIQUE IV As exposed in figure 1, this way combines two approaches : . a metallurgical one : knowledge of the metallurgical behaviour in terms of recrystallization laws, allotropic transformation, and pricipitation.