Characterization of rapidly solidified powder of high-speed steel

Abstract

Rapidly solidified particles of high-speed steel were classified into several granulometric fractions ranging from less than 25 μm up to more than 160 μm in diameter and studied by transmission and conversion electron Mössbauer 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 (bcc-Fe) and austenite (fcc-Fe), respectively. In addition, M 4 C 3 and M 2 C carbides were found. The magnetic phase diminishes in the bulk of the particles bigger than 63 μm (transmission Mössbauer spectroscopy) and/or 80 μm (X-ray diffraction). Its contribution is higher at the surface of the particles (conversion electron Mössbauer spectrometry). The origin of the non-magnetic phase is not changed even at 5 K. Reasonable agreement is achieved between Mössbauer and X-ray diffraction data as far as the fraction of Fe-containing phases is concerned.

Precipitation of oxide dispersion strength steels after long-term annealing at temperature of 475 °C

“…Different types of alloys are suitable for advanced applications, and therefore, it is necessary to analyse them using different experimental nuclear-physical techniques [1][2][3][4][5][6][7][8][9]. Undoubtedly, the most important alloys used in the primary circuit are anti-corrosion steels, where, in addition to carbon, other elements, such as chromium, manganese, nickel, and titanium, are added to improve their physical, chemical, and mechanical properties [10][11][12][13][14][15][16][17][18][19][20][21].…”

Microstructure of High‐Chromium Ferritic–Martensitic Steels for Next‐Generation Reactors

“…[1][2][3][4][5][6][7][8][9][10][11] Various types of alloys are potentially suitable for advanced (nuclear) applications; therefore, it is necessary to analyze suitable candidates using variety of experimental techniques in order to understand the microstructure and potential irradiation resistance of a given material. [12][13][14][15][16][17][18][19][20][21] The most common alloys used in the primary circuit of nuclear power plants are steels, where carbon, chromium, manganese, nickel, titanium, and other elements (additives) are added in order to improve their physical, chemical, and mechanical properties. [14,[22][23][24][25][26][27][28] Purposeful choice of construction material reflects the type of nuclear facility, i.e., the type of nuclear reactor or the type of coolant/cooling system.…”