Abstract
The present work characterized and modelled the interfacial heat transfer coefficient and friction coefficient of a non-alloy martensitic steel, for a novel Fast light Alloy Stamping Technology (FAST) process. These models were validated through temperature evolution, thickness distribution and springback measurements on experimentally formed demonstrator components, which were conducted on a pilot production line and showed close agreement, with less than 10% variation from experimental results. The developed models and finite element simulations presented in this work demonstrate that non-isothermal processes can be precisely simulated with implementation of the accurate thermomechanical boundary conditions.
Highlights
Hot and warm stamping technologies have been widely applied to the forming of sheet metals, in which a sheet blank is first heated to elevated temperatures, transferred to a press, and deformed and simultaneously quenched within tooling at, or slightly above, room temperature
The interfacial heat transfer coefficient (IHTC) was characterized by using an inverse technique, through the comparison of the difference between the experimental and finite element (FE)-simulated temperature histories
As a result of the high strednetgetrmh ionfedthIeHTmCaratnednfsriicttiiconstecoeelf,fiictisenptlawsetriec adcecuforartme iantiporned,iactnindg tthheuspltahstiincnbienhgav, iworearnedsuccessfully captured by thderaswimabiuliltyatoifotnhe. mTahreternesfitoicrest,eethl deuerixncgethlleeFnAtSfiTtftoirnmginbgeptrwoceesesn. the experimentally-measured and FE-simulated thickness distribution indicated that the determined IHTC and friction coefficient were accurate in predicting the plastic behavior and drawability of the martensitic steel during the Fast light Alloy Stamping Technology (FAST)
Summary
Hot and warm stamping technologies have been widely applied to the forming of sheet metals, in which a sheet blank is first heated to elevated temperatures, transferred to a press, and deformed and simultaneously quenched within tooling at, or slightly above, room temperature. It has been proven that titanium alloys could be formed under hot/warm stamping conditions to produce complex geometries [3] These promising technologies are significantly beneficial for improving the formability of materials, while reducing the springback of formed components, which has been of significant interest to academia and industry [4]. Similar to the friction coefficient, the IHTC is affected by contact pressure and lubricant [15] The combination of these parameters and their effects on the IHTC may influence the post-form strength of materials such as high-strength steels [16] and heat-treatable aluminum alloys [17], due to precipitates generated during quenching. In order to accurately simulate the interaction between the thermal and mechanical fields of the FAST forming process, the thermomechanical boundary conditions of the non-alloy martensitic steel must be determined. An optimized FE simulation of the FAST forming processes was realized
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