Cross wedge rolling of a Ti6Al4V (ELI) alloy: the experimental studies and the finite element simulation of the deformation and failure

Abstract

The cross wedge rolling (CWR) deformation and fracture of a Ti6Al4Al (ELI) alloy were investigated experimentally and numerically using a coupled thermomechanical finite element model analysis. The experimentally determined flow stress and damage model parameters were verified by tension split Hopkinson pressure bar testing of notched samples. The simulation and experimental CWR forces showed well agreements except near the end of the stretching zone. The model analysis showed that the temperature distribution in the work piece was nonuniform during the CWR. When the initial temperature of the work piece was relatively low, the work piece temperature increased, a heating effect of the plastic deformation, while relatively high initial work piece temperatures resulted in cooling the work piece, caused by the work piece contact with the tools. The cracks were shown numerically to initiate in the midsections of the work piece during the guiding action and elongated in a direction normal to the maximum tensile stress triaxiality, resulting in cruciformshaped crack formation, which was well agreed with the previously observed crack shape.

Crushing and energy absorption characteristics of combined geometry shells at quasi-static and dynamic strain rates: Experimental and numerical study

“…The details of the used 316L stainless steel bar tensile SHPB and the methodology of extracting material constitutive equation are given elsewhere [23]. The axial displacements of quasi-static test specimens were recorded using a video extensometer, while a high speed camera was used to monitor the deformation during the SHPB tension tests.…”

Research and industrialization of near-net rolling technology used in shaft parts

“…Zhang et al [31,32] conducted thermo-mechanical coupled numerical simulation and analyzed the microstructure changes of GH4169 alloy forming by CWR. Çakırcalı et al [33] experimentally and numerically investigated CWR deformation and fracture of Ti6Al4V alloy. Mirahmadi et al [34] analyzed the effects of CWR tool parameters on formability of Nimonic 80A and Nimonic 115 superalloys.…”

Experimental Study on Cross Wedge Rolling of 21-4N Heat Resistant Steel

“…Peng studied the 42CrMo/Q235 laminated shaft forming by CWR and analyzed the interface properties [15][16][17]. Metin experimentally and numerically studied the deformation and failure of cross wedge rolling of a Ti6Al4V alloy [18]. Li et al researched the effects of cross wedge rolling parameters on the formability of a Ti-6Al-4V alloy [19].…”