|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced High-Strength Steels
||F-21: Multi-stage Martensitic Phase Transformation in Steel/Copper Nanolaminates: An In Situ X-ray Study
||Kaiyuan Yu, Yadong Ru, Yang Ren, Lishan Cui
|On-Site Speaker (Planned)
Nanolamellar high-carbon-steel/Cu composites are fabricated by hot pressing, rolling and wire drawing. Cu layers (100 nm) suppress the growth of the steel layers (100 nm) above austenization temperature, and the subsequent quenching and partitioning processes introduce a large amount of nanosized retained austenite in steel. Stress- and strain- induced martensitic transformation of the retained austenite is characterized by in situ tensile tests under synchrotron X-ray at different temperatures. The transformation rate of retained austenite is drastically higher during the stress-induced regime than the strain-induced regime. Unusual multi-stage yielding is observed, which is attributed to stress-induced transformation that occurs in a manner of Luders band. A deformation mechanism map of the composites is proposed.
||Planned: Supplemental Proceedings volume