|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Ultrafine-grained and Heterostructured Materials (UFGH XII)
||Microstructural Evolution and Tensile Properties of Nano-crystalline Twinning Induced Plasticity Steel Produced by High-pressure Torsion
||Gyeonghyeon Jang, Jae Nam Kim, Hakhyeon Lee, Taekyung Lee, Nariman Enikeev, Marina Abramova , Ruslan Z Valiev, Hyoung Seop Kim, Chong Soo Lee
|On-Site Speaker (Planned)
In this study, microstructural evolution and tensile properties of nanocrystalline (NC) twinning induced plasticity steel (TWIP) steel were investigated. Increasing high-pressure torsion revolutions resulted in the grain refinement: after 10 revolutions, the initial fine (10 μm) and coarse (100 μm) grained materials were refined to the average grain sizes of 21 and 51 nm, respectively. Tensile strength was increased with decreasing grain size. However, the initial fine grained material exhibited the inverse Hall-Petch effect in the regime of nano-size grain; the maximal grain refinement after 10 revolutions resulted in the reduction of the tensile strength by 350 MPa as compared to the state achieved by 5 revolutions. TEM observation on the finest (21 nm) grained specimen showed that the softening was closely associated with the absence of deformation twins and the formation of numerous stacking faults.
||Mechanical Properties, Iron and Steel, Nanotechnology