NDLI: Stability of the α-Mn structure in rapidly solidified Fe–Mo–Cr

Content Provider	Springer Nature Link
Author	Velikava, T. A. Karpets, M. V. Kuprin, V. V.
Copyright Year	2013
Abstract	High-temperature X-ray diffraction is used to study the evolution of phase states of rapidly solidified Fe$_{64.9}$Mo$_{19.6}$Cr$_{14.5}$C (at.%) alloy during heating from room to solidus temperatures. The α- and β-Mn-like phases (χ and π, respectively), as well as bcc phases of various composition (α$_{1}$, α$_{2}$, α), η-carbon intermetallic (M$_{6}$C), and R- and fcc phases are identified in the alloy. It is established that the χ-phase is stable in this alloy at high temperatures: it forms during heating in the range 973–1073 K, changes its chemical composition in the range 1073–1273 K, which remains unchanged at 1073–1473 K, and decomposes in the range 1473–1523 K; when it is heated, its relative amount and lattice parameter symbatically change from 20 to 55 wt.% and from 0.9061 to 0.9170 nm, the coefficient of thermal expansion being 16.65∙10$^{–6}$ K$^{–1}$. The existence of equilibrium regions with participation of the stable χ-phase, γ + α + χ + R, χ + γ + η + α, χ + η + γ + α, and χ + α + η + R, has been established in the Fe–Mo–Cr–C phase diagram for the first time. It is shown that the π-phase, found in the initial spinning alloy, is metastable. This phase abruptly changes its composition near 842 K and completely decomposes in the range 923–1073 K. When heated in the range 293–923 K, its relative amount and lattice parameter vary from 50 to 8 wt.% and from 0.6346 to 0.6401 nm, respectively, the coefficient of thermal expansion being 2.083∙10$^{–6}$ K$^{–1}$. The coefficients of thermal expansion of the η- and α-phases are 15.257∙10$^{–6}$ and 7.117∙10$^{–6}$ K$^{–1}$. It is revealed that the temperature of full decomposition of the metastable β-Mn-like phase and appearance of the stable α-Mn-like phase in conditions of high-temperature X-ray diffraction is close to 978 K of α-Mn→ β-Mn polymorphic transformation in pure manganese. The high-temperature X-ray diffraction experiment indicates that π→α transformations of metastable phases and γ→α transformations of stable phases are diffusionless in this alloy.
Starting Page	212
Ending Page	222
Page Count	11
File Format	PDF
ISSN	10681302
Journal	Powder Metallurgy and Metal Ceramics
Volume Number	52
Issue Number	3-4
e-ISSN	15739066
Language	English
Publisher	Springer US
Publisher Date	2013-08-24
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mn-like phases spinning method high-temperature X-ray diffraction diffusionless transformations coefficient of thermal expansion Fe–Mo–Cr–C phase diagram Characterization and Evaluation of Materials Metallic Materials Ceramics, Glass, Composites, Natural Methods
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Materials Chemistry Mechanics of Materials Metals and Alloys Condensed Matter Physics

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