期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 507, 期 1-2, 页码 144-148出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2008.12.033
关键词
Grain boundaries; Mechanical alloying; Phase transformation; Nanostructured
类别
资金
- Isfahan University of Technology
In this study, phase transformation of alpha to gamma in a nanostructured high-nitrogen Fe-18Cr-11Mn austenitic stainless steel powder produced by mechanical alloying (MA) was investigated. MA was performed under nitrogen and argon atmospheres using a high-energy planetary ball mill. The obtained results from X-ray diffraction (XRD) and Oxygen/Nitrogen analyser revealed that nitrogen solubility in powders significantly increases by increasing the milling time under nitrogen atmosphere. Nitrogen solubility reaches to 0.65 wt% in samples milled for up to 100 h. The obtained results also indicated that MA in argon (Ar) atmosphere produces a ferrite structure after 120 h of milling. In contrast, a completely austenitic structure was obtained by performing MA for 100 h in nitrogen (N-2) atmosphere. Nanostructured powders of below 10 nm grain sizes were obtained by MA under both At and N2 atmospheres. (C) 2008 Elsevier B.V. All rights reserved.
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