Abstract
In aerospace and automotive industries, hot press forming (HPF) technology is widely used for rapid and precise deformation of the complex sheet metal component, where the fracture behavior has always been a focused problem. In this study, the hot tensile test and the Nakazima test were carried out, in order to establish the Misiolek constitutive equation and determine the forming limit strain points at an elevated temperature, respectively. The microstructure evolution during the tensile test was also investigated by optical microscope. In addition, the Marciniak–Kuczynski (M–K) model, considering the Mises, Hill48, and Logan–Hosford yield criteria, was utilized to calculate the theoretical forming limit curve (FLC). Furthermore, the fracture behavior of the TA32 alloy sheet during the HPF process was accurately predicted by inserting the predicted FLC into finite element simulation, and the qualified complex component was obtained by optimizing the shape of the sheet.
Highlights
Nowadays, titanium and titanium alloys are extensively used in the aerospace, marine, automotive, and medical industries
The TA32 alloy is a new type of near-α high temperature titanium alloy with good comprehensive performance
hot press forming (HPF) technology is preferred in sheet metal forming, due to its advantages of higher production efficiency and lower manufacturing cost compared with the metal additive manufacturing [4]
Summary
Titanium and titanium alloys are extensively used in the aerospace, marine, automotive, and medical industries. This is due to their superior high temperature performance, high specific strength, low density, corrosion resistance, good creep resistance, and excellent biocompatibility [1]. The alloy’s long-term working temperature can reach 550 ◦ C, and it has wide application prospects in the cylinder of the advanced aeroengine afterburner and the structure of the cruise missile [2]. As one of the more advanced manufacturing technologies, the hot press forming (HPF) process has been actively developed, which can reduce forming time and improve dimensional precision [3]. Accurately predicting the fracture behavior of TA32 alloy in HPF has important significance for engineering applications
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