Formation of chromium-alloyed cementite in the process of mechanosynthesis and subsequent annealings

• Published in: Physics of metals and metallography 2015-03, Vol.116 (3), p.293-301
• Main Authors: Chulkina, A. A., Ulyanov, A. I., Zagainov, A. V., Ulyanov, A. L., Yelsukov, E. P.
• Format: Article
• Language: English
• Subjects: Annealing; Ball mills; Bearing steels; Carbides; Cementite; Chemistry and Materials Science; Chromium steels; Composition effects; Diffusion; Formations; Intermetallic compounds; Iron compounds; Magnetic properties; Magnetization; Materials Science; Metallic Materials; Phase Transformations; Phases; Powders; Saturation (magnetic); Specialty metals industry; Steels; Structure
• ISSN: 0031-918X; 1555-6190
• DOI: 10.1134/S0031918X15030035

Mössbauer spectroscopy and magnetic measurements have been used to investigate the formation of phases in the process of mechanosynthesis of a nanocomposite of composition (Fe 0.93 Cr 0.07 ) 75 C 25 in a planetary ball mill with the subsequent annealings at various temperatures. It has been shown that, at the initial stage of the mechanosynthesis, an amorphous Fe-C phase is formed. Later, an amorphous Fe-Cr-C phase is formed and, in the process of the subsequent mechanosynthesis, an alloyed cementite is formed from it. It has been found that, due to the products of the pickup from the milling balls made of ShKh15 steel, the changes in the initial composition (Fe 0.93 Cr 0.07 ) 75 C 25 of the powders that reach 5 wt % have almost no effect on the phase composition, specific saturation magnetization, and the coercive force of samples annealed at 800°C for 1 h.