Pack-boriding of Fe-Mn binary alloys: Characterization and kinetics of the boride layers

Journal Article · Mon Feb 15 00:00:00 EST 2010 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2009.12.005· OSTI ID:22066182

Bektes, M ^[1]; Calik, A ^[2]; Ucar, N ^[1]; Keddam, M ^[3]

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1. Department of Physics, Arts and Science Faculty, Suleyman Demirel University, Isparta (Turkey)
2. Department of Mechanical Education, Technical Education Faculty, Suleyman Demirel University, Isparta (Turkey)
3. Departement de S.D.M., Faculte de G.M. et G.P., U.S.T.H.B, B.P. No32, 16111, El-Alia, Bab-Ezzouar, Algiers (Algeria)

In this work, the boronizing of Fe-Mn binary alloys at 0.42, 0.76 and 0.94 wt.% Mn was carried out in a solid medium using the powder pack method. In this method, commercial Ekabor-II boron source and activator (ferro-silicon) were thoroughly mixed to form the boriding medium. The samples were boronized in an electrical resistance furnace for exposure times of 2, 4, 6 and 8 h at 1173 K under atmospheric pressure and a series of boronized samples in the temperature range 1073-1373 K for 3 h. After the furnace process, boronized samples were removed from the furnace and cooled in air. Afterwards, the boride layers generated by the pack-boronizing process were characterized by optical microscopy, scanning electron microscopy, XRD analysis, Vickers microhardness and tensile testing. The generated boride layers, showing a saw-tooth morphology, had a surface microhardness in the range 1400-1270 HV0.1. It was shown that the values of yield stresses and ultimate tensile stresses were increased as the Mn content increases in the boronized Fe-Mn binary alloys. In contrast, the values of elongations determined from the stress-strain curves were decreased. Furthermore, it was found that the calculated mean value of the activation energy of boron diffusion was close to 119 J/mol.

• OSTI ID: 22066182
• Journal Information: Materials Characterization, Vol. 61, Issue 2; Other Information: Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
BINARY ALLOY SYSTEMS
BORIDES
BORON
DIFFUSION
ELECTRIC CONDUCTIVITY
IRON ALLOYS
LAYERS
MANGANESE ALLOYS
MATERIALS TESTING
MICROHARDNESS
MORPHOLOGY
OPTICAL MICROSCOPY
SCANNING ELECTRON MICROSCOPY
SILICON
STRESSES
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
X-RAY DIFFRACTION