Investigation and evaluation of hot deep drawing parameters to manufacture titanium sheet metal parts for high temperature applicationsFriday (10.11.2017) 10:55 - 11:15 Part of:
Sheet metal parts of titanium and its alloys are appreciated in many industrial sectors because of their beneficial properties regarding weight, strength and oxidation resistance. Depending on the type of alloy and the part geometry there are different forming procedures from cold forming of commercially pure titanium with subsequent separate annealing up to superplastic forming with integrated annealing. Hot deep drawing (HDD) is an innovative promising compromise to save cost by saving production time and to reduce the expenses for surface treatment. Parts made by HDD provide a high accuracy and constant wall thickness suitable for automated industrial assembly processes as required for high temperature applications such as exhaust systems in aircraft or automotive.
Consequently, typical peculiarities of titanium like anisotropic forming behavior, springback after forming and distinct surface oxidation at elevated temperatures have to be considered during HDD regarding the follow-up processes.
In order to figure out the applicability of the HDD process to further titanium alloys different titanium sheet alloys were selected and investigated by utilizing a hot-form simulator of type Gleeble 3500. Parameters such as forming temperature and forming speed as well as holding time during creep relaxation have been varied and subsequently analyzed and evaluated regarding their effect on the forming behavior, but also on the resulting microstructure and mechanical properties. The results are used to derive a material model that enables after implementation into a commercial finite element tool the forming simulation under HDD conditions.
In this paper the first results will be presented and discussed.
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