Characterization of rapidly solidified powder of high-speed steel

0339990 - ÚACH 2010 RIV NL eng J - Journal Article
Miglierini, M. - Lančok, Adriana - Kusý, M.
Characterization of rapidly solidified powder of high-speed steel.
Hyperfine Interactions. Roč. 190, 1-3 (2009), s. 51-57. ISSN 0304-3843
R&D Projects: GA ČR GP203/07/P011
Grant - others:GA(SK) VEGA1/3190/06
Institutional research plan: CEZ:AV0Z40320502
Keywords : Rapidly solidified powder * Tool steel * Mössbauer spectroscopy
Subject RIV: CA - Inorganic Chemistry
Impact factor: 0.209, year: 2007

Rapidly solidified particles of high-speed steel were classified into several granulometric fractions ranging from less than 25 mu m up to more than 160 mu m in diameter and studied by transmission and conversion electron Mossbauer spectrometry. The former was applied at 300, 77, and 5 K. Presence of magnetic and a non-magnetic crystallographic phase was observed. They were identified by X-ray diffraction as ferrite (bec-Fe) and austenite (fcc-Fe), respectively. In addition, M4C3 and M2C carbides were found. The magnetic phase diminishes in the bulk of the particles bigger than 63 mu m (transmission Mossbauer spectroscopy) and/or 80 mu m (X-ray diffraction). Its contribution is higher at the surface of the particles (conversion electron Mossbauer spectrometry). The origin of the non-magnetic phase is not changed even at 5 K. Reasonable agreement is achieved between Mossbauer and X-ray diffraction data as far as the fraction of Fe-containing phases is concerned.
Permanent Link: http://hdl.handle.net/11104/0183338