|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Late News Posters
||PP-20: Investigation of Phase Stability and Grain Growth in Nanostructured 316L Stainless Steel Produced by High-energy Mechanical Milling at Cryogenic Temperature
||Hasan Kotan, Kris Darling
|On-Site Speaker (Planned)
Commercial 316L stainless steel powder with yttrium addition was nanostructured by mechanical milling at cryogenic temperature and subjected to annealing treatments at various temperatures. Microstructural evolutions were carried out using X-ray diffraction (XRD), focused ion beam microscopy (FIB) and transmission electron microscopy (TEM) techniques. It was observed that the austenite in as-received powder partially transformed to martensite phase during mechanical milling whereas the annealing induced reverse transformation of martensite-to-austenite. Furthermore, while the austenite-to-martensite phase ratio increased with increasing annealing temperature, the equilibrium structure was not achieved after three hours annealing up to 1200 °C. The grain size of nanostructured 316L steel is maintained in the nanoscale range after three hours annealing up to 1100 °C by adding 1.5 at% yttrium as opposed to micron size grains of plain 316L steel at the same annealing temperature.