|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced High-strength Steels
||Cavitation Behavior of an Advanced High-Mn Austenitic TWIP Steel Microalloyed with V and Nb Under Hot-tensile Condition
||Enrique Salas, Ignacio Mejía, José María Cabrera
|On-Site Speaker (Planned)
It is well known that failure of metallic materials in tension takes place by spontaneous cavitation mechanism, which restricts hot-metal forming. Regardless of superior strength and ductility of high-Mn TWIP steels, it is very important to know in depth the metallurgical features affecting their manufacture. The aim of this research work is to evaluate the effect of V and Nb microaddition on cavitation mechanisms of Fe-21Mn-1.5Al-1.3Si-0.5C TWIP steel under uniaxial hot-tensile condition. For this purpose, uniaxial hot-tensile tests were carried out at 800-900 °C and constant true strain rate of 10-3s-1. Light optical and scanning electron microscopies were applied to quantify cavities along longitudinal section of deformed samples near to the fracture surface. Results indicate that embrittlement is stated through void interconnection mechanism due to the existence of second-phase particles, affecting the stress state and weakening grain cohesion. Crack evolution is explained in terms of dynamic recrystallization during hot deformation.
||Planned: Supplemental Proceedings volume