|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced High-strength Steels
||Thermal Stability of Precipitated Austenite in Fe-10Ni-0.1C Steel
||Ian Harding, Sharvan Kumar
|On-Site Speaker (Planned)
The high strength Fe-10Ni-0.1C-(Mo, V) steel in an optimally heat-treated condition is perceived as a potential candidate for US Navy ship structures requiring improved ballistic resistance. Following austenitizing and quenching, a two-step tempering cycle is employed when sub-micron size Ni-rich austenite precipitates in a martensitic matrix; the stability of the precipitated austenite relies on its composition and size. Thus, a relatively low-Ni content, coarse austenite particle is likely to revert back to martensite on cooling from the tempering temperature. The stability of such austenite particles is important as it can enable deformation-induced phase transformation that can discourage shear localization and postpone failure. In this investigation, we examine in detail the effect of heat treatment temperature and time on the composition, volume fraction, and size on the stability of the precipitated austenite phase using a suite of electron microscopy techniques. Findings will be presented and their implications on deformation response discussed.
||Planned: Supplemental Proceedings volume