|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced High-Strength Steels
||Design of a Core-Shell Structure Carbide for Enhancing Toughness of UHS Steels
||Wei Xiong, Ye Tian, Oleg Y. Kontsevoi , Gregory B. Olson
|On-Site Speaker (Planned)
At ambient temperature service, Zener pinning grain refiners often act as microvoid nucleation sites, participating in the ductile fracture process. In order to reduce the microvoid softening effects due to these residual carbides, it is desirable to strengthen the interface bonding between matrix and these MC carbides, and thus delay the microvoid softening. We employ the highly-precise FLAPW method to compute the interfacial adhesion between matrix Fe and different transition metal carbides. The calculated separation energy clearly demonstrates the sequence of cohesion energy by substituting different species in the metal sublattice of MC. Post heat treatment was designed employing a CALPHAD database, which leads to a successful demonstration of designed core-shell Zener pinning particles according to the DFT calculations. STEM validates the particle dispersion with low volume fraction and mean size between 50 and 200 nm, ideally suited to act as a Zener pinning particle dispersion with improved adhesion energy.
||Planned: Supplemental Proceedings volume