|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Nanocrystalline and Ultra-fine Grain Materials and Bulk Metallic Glasses
||Thermal Stability of Defect Structure and Phase Composition in Ultrafine-grained 316L Stainless Steel Processed by High-pressure Torsion
||Moustafa El-Tahawy, Jenő Gubicza, Yi Huang, Hyelim Choi, Heeman Choe, János L. Lábár, Terence G. Langdon
|On-Site Speaker (Planned)
The thermal stability of ultrafine-grained (UFG) microstructure in 316L stainless steel processed by High-Pressure Torsion (HPT) was investigated by differential scanning calorimetry (DSC) up to 1000 K. In the DSC thermograms two peaks were observed. The first, exothermic peak is related to the annihilation of vacancies and dislocations. During this recovery, the phase composition and the average grain size were practically unchanged. The activation energy of recovery was determined from the variation of DSC peak temperature versus heating rate. The second, endothermic peak was caused by a reverse transformation of alpha-prime martensite to gamma-austenite, however in this temperature range dislocation annihilation and a grain growth from 45 to 195 nm also occurred. It was concluded that the hardness of the annealed samples is mainly determined by the grain size. The combination of HPT processing and annealing at 1000 K resulted in an UFG gamma-austenite with high hardness of 4900 MPa.
||Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)