Characterization of Thermomechanical Boundary Conditions of a Martensitic Steel for a FAST Forming Process

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.

Experimental and modelling studies of the transient tribological behaviour of a two-phase lubricant under complex loading conditions

“…The transient lubricant behaviours of the two-phase lubricant studied in the present research were caused by the changes in lubrication mechanisms during sliding wear, which transformed from fluid boundary lubrication to thin-film boundary lubrication and finally dry sliding (between substrate materials) [4,10,11,37].…”

Minimisation of Heating Time for Full Hardening in Hot Stamping Using Direct Resistance Heating

“…Sun et al [17] investigated the ductility and post-form strength to form a martensitic steel MS1180 into a complex-shaped component using a fast-warm stamping technique at the forming temperature range of 400-450 • C with the heating rate over 50 • C/s. Liu et al [18] studied the characterization of thermomechanical boundary conditions of non-alloy martensitic steel for a fast forming process.…”