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Effect of boron concentration on the solidification microstructure and properties of Fe‐Cr‐B alloy

Effect of boron concentration on the solidification microstructure and properties of Fe‐Cr‐B alloy In this article, the effect of boron concentration (B = 0, 0.4, 0.8, 1.4 and 2.0 respectively) on the solidification microstructure and properties of Fe‐Cr‐B alloy containing 0.35% C, 10–12% Cr, 0.5–0.8% Si, and 0.7–1.0% Mn was studied by means of the optical microscope (OM), the scanning electron microscope (SEM), X‐ray diffraction (XRD), Rockwell hardness and Vickers hardness tester. The results indicate that the microstructure of boron‐free sample consists of the martensite, and its hardness reaches 59.2 HRC. When a small amount of boron element was added, the eutectic phase of network structure generated along the grain boundary. The amount of eutectic phase increases when the boron concentration increases. Moreover, the eutectic phase is the mixture of boride and boron carbide. The boride is Fe2B and the boron carbide is (Cr, Fe)7(C, B)3. Compared with boron‐free sample, the Rockwell hardness of the samples with different boron concentrations are all higher, above 62 HRC, and the hardness grow up with the increase of boron concentration. When the boron concentration reaches to 1.4%, the Rockwell hardness of the alloy is 65.7 HRC, which is the highest in this study. When the boron concentration rises to 2.0%, the hardness has no obvious change. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Materialwissenschaft Und Werkstofftechnik Wiley

Effect of boron concentration on the solidification microstructure and properties of Fe‐Cr‐B alloy

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References (8)

Publisher
Wiley
Copyright
Copyright © 2011 Wiley Subscription Services
ISSN
0933-5137
eISSN
1521-4052
DOI
10.1002/mawe.201100753
Publisher site
See Article on Publisher Site

Abstract

In this article, the effect of boron concentration (B = 0, 0.4, 0.8, 1.4 and 2.0 respectively) on the solidification microstructure and properties of Fe‐Cr‐B alloy containing 0.35% C, 10–12% Cr, 0.5–0.8% Si, and 0.7–1.0% Mn was studied by means of the optical microscope (OM), the scanning electron microscope (SEM), X‐ray diffraction (XRD), Rockwell hardness and Vickers hardness tester. The results indicate that the microstructure of boron‐free sample consists of the martensite, and its hardness reaches 59.2 HRC. When a small amount of boron element was added, the eutectic phase of network structure generated along the grain boundary. The amount of eutectic phase increases when the boron concentration increases. Moreover, the eutectic phase is the mixture of boride and boron carbide. The boride is Fe2B and the boron carbide is (Cr, Fe)7(C, B)3. Compared with boron‐free sample, the Rockwell hardness of the samples with different boron concentrations are all higher, above 62 HRC, and the hardness grow up with the increase of boron concentration. When the boron concentration reaches to 1.4%, the Rockwell hardness of the alloy is 65.7 HRC, which is the highest in this study. When the boron concentration rises to 2.0%, the hardness has no obvious change.

Journal

Materialwissenschaft Und Werkstofftechnik – Wiley

Published: Jan 1, 2011

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