WEB Computational design and processing simulation of V containing ultra-high strength automotive steelsThursday (24.09.2020) 16:50 - 17:20 S: Structural Materials 2 Part of:
Hydrogen induced delayed fracture is a significant barrier to the widespread application of martensitic steels over 1500MPa ultimate tensile strength in structural applications in the automotive industry. Charging of Hydrogen during processing, such as can occur in press hardening and electro-galvanising, can result in subsequent cracking and splitting caused by hydrogen diffusion at high residual stress part features such as trimmed edges and pierced holes. As a result, manufacturers are required to use restrictive countermeasures to avoid the risk hydrogen induced delayed fracture in these types of steels, which reduce their robustness and breath of application.
Several studies in the last two decades [Asahi 2003, Szost 2013, Turk 2018, Cho 2018] have demonstrated that Vanadium additions to steels with highly dislocated microstructure can yield carbides which act as functional trapping sites for diffusible Hydrogen, with apparent benefits in resistance to hydrogen induced delayed fracture. In this paper, we explore the practicalities of alloy design and processing to form these Vanadium carbides using computational thermodynamic methods and propose a composition and processing concept for an 1800MPa ultimate tensile strength press hardening steel with enhanced delayed fracture resistance via an optimal carbide structure.
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