Details

Title

Meta-stable Solidification Created by the Detonation Method of Coating Formation

Journal title

Archives of Foundry Engineering

Yearbook

2012

Numer

No 2

Publication authors

Keywords

Theory of crystallization ; Rapid Solidification Process ; Fe-Al Coating ; Meta-Stable Phase Diagram ; Amorphous Phase

Divisions of PAS

Nauki Techniczne

Description

Archives of Foundry Engineering continues the publishing activity started by Foundry Commission of the Polish Academy of Sciences (PAN) in Katowice in 1978. The initiator of it was the first Chairman Professor Dr Eng. Wacław Sakwa – Corresponding Member of PAN, Honorary Doctor of Czestochowa University of Technology and Silesian University of Technology. This periodical first name was „Solidification of Metals and Alloys” , and made possible to publish the results of works achieved in the field of the Basic Problems Research Cooperation. The subject of publications was related to the title of the periodical and concerned widely understand problems of metals and alloys crystallization in a casting mold. In 1978-2000 the 44 issues have been published. Since 2001 the Foundry Commission has had patronage of the annually published “Archives of Foundry” and since 2007 quarterly published “Archives of Foundry Engineering”. Thematic scope includes scientific issues of foundry industry:

  • Theoretical Aspects of Casting Processes,
  • Innovative Foundry Technologies and Materials,
  • Foundry Processes Computer Aiding,
  • Mechanization, Automation and Robotics in Foundry,
  • Transport Systems in Foundry,
  • Castings Quality Management,
  • Environmental Protection.

Abstract

Particles of the Fe-Al type (less than 50 µm in diameter) were sprayed onto the 045 steel substrate by means of the detonation method. The TEM, SAED and EDX analyses revealed that the Fe-Al particles have been partially melted in the experiment of coating formation. Particle undergone melting even within about 80% of its volume. Therefore, solidification of the melted part of particles was expected. Solidification differed significantly due to a large range of chemical composition of applied particles (from 15 at.% Al up to 63 at.% Al). A single particle containing 63 at.% Al was subjected to the detailed analysis, only. The TEM / SAED techniques revealed in the solidified part of particle three sub-layers: an amorphous phase, A ε , periodically situated FeAl + Fe2Al5 phases, and a non-equilibrium phase, Nε . A hypothesis dealing with the inter-metallic phases formation in such a single particle of the nominal composition 0 N = 0.63 is presented. At first, the solid / liquid system is treated as an interconnection: substrate liquid nonmelted particle part / / . Therefore, it is suggested that the solidification occurs simultaneously in two directions: towards a substrate and towards a non-melted part of particle. The solidification mechanism is referred to the Fe-Al meta-stable phase diagram. It is shown that the melted part of particle solidifies rapidly according to the phase diagram of meta-stable equilibrium and at a significant deviation from the thermodynamic equilibrium.

Publisher

The Katowice Branch of the Polish Academy of Sciences

Date

2012

Type

Artykuły / Articles

Identifier

ISSN 2299-2944

References

Wang H. (2007), Microstructural characterization of cold-sprayed nano-structured FeAl inter-metallic compound coating and its ball-milled feedstock powders, Journal of Thermal Spray Technology, 16, 669, doi.org/10.1007/s11666-008-9225-x ; Devi S. (1997), Application of reaction synthesis principles to thermal spray coatings, Journal of Materials Science, 32, 3315, doi.org/10.1023/A:1018691826809 ; Kobayashi S. (2002), Control of inter-metallic compound layers at interface between steel and aluminum by diffusion treatment, Materials Science and Engineering, A338, 44, doi.org/10.1016/S0921-5093(02)00053-9 ; Guilemany J. (2006), Studies of Fe-40Al coatings obtained by high velocity oxy-fuel, Journal of Surface & Coating Technology, 201, 2072, doi.org/10.1016/j.surfcoat.2006.04045 ; Senderowski C. (2007), Influence of gas detonation spraying conditions on the quality of Fe-Al inter-metallic protective coatings, Archives of Foundry Engineering, 7, 1, 147. ; Wołczyński W. (2011), Meta-stable conditions of diffusion brazing, Archives of Metallurgy and Materials, 56, 311, doi.org/10.2478/v10172-011-0035-7 ; Kubaschewski O. (1982), IRON-Binary Phase Diagrams. ; Umeda T. (1996), Phase selection during solidification of peritectic alloys, Acta Materiallia, 44, 4209, doi.org/10.1016/S1359-6454(96)00038-9 ; Wołczyński W. (2006), Mass transport during diffusion soldering or brazing at the constant temperature, null, 12. ; Aziz M. (1982), Model for solute redistribution during rapid solidification, Journal of Applied Physics, 53, 2, 1158, doi.org/10.1063/1.329867 ; Wołczyński W. (2003), Recent Research Developments in Materials Science, 541.

DOI

10.2478/v10266-012-0044-7

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