Microstructure Evolution Simulation of GH4169 Fasteners in Forging Process

Abstract

This paper mainly calculated the microstructure evolution characteristics of GH4169 alloy fasteners during hot forging deformation. The constitutive equation and the microstructure evolution models of the material were embedded in the finite element software. By analysis, the grain size and dynamic recrystallization volume fraction were calculated, and the key points on the fastener in forging process were analyzed. As a result, the microstructure evolution of the GH4169 alloy fastener during the hot forging deformation process was obtained. The results show that, through the plastic deformation by the hot forging process, the grain size on the fastener’s head is gradually refined, the minimum average grain size is reduced from the initial 100μm to less than 10μm. During the deformation process, the splinted part of the fastener begins to undergo dynamic recrystallization first. After that, dynamic recrystallization volume fraction gradually increases from the central region to the edge, with the highest value of 60%. These results provide a basic data reference for GH4169 fastener forging process development and parameters optimization.