Microstructural and mechanical characterization of an ultra-high-strength Fe86.7Cr4.4Mo0.6V1.1W2.5C4.7 alloy

This study describes the correlation between microstructure and mechanical properties of an ultra-high-strength Fe 86.7 Cr 4.4 Mo 0.6 V 1.1 W 2.5 C 4.7 (at.%) alloy manufactured under high cooling rates and pure conditions. The applied preparation conditions promote the formation of non-equilibrium...

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Bibliographic Details
Published in:Journal of materials science 2012, Vol.47 (1), p.267-271
Main Authors: Hufenbach, J., Kohlar, S., Kühn, U., Giebeler, L., Eckert, J.
Format: Article
Language:English
Subjects:
Carbides
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Compressive strength
Cooling rate
Correlation analysis
Crystallography and Scattering Methods
Heat treating
High strength
Ingot casting
Martensite
Materials Science
Mechanical properties
Microstructure
Polymer Sciences
Retained austenite
Solid Mechanics
Tensile strength
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Summary:This study describes the correlation between microstructure and mechanical properties of an ultra-high-strength Fe 86.7 Cr 4.4 Mo 0.6 V 1.1 W 2.5 C 4.7 (at.%) alloy manufactured under high cooling rates and pure conditions. The applied preparation conditions promote the formation of non-equilibrium phases such as martensite, retained austenite and special carbides already in the as-cast state. The carbides form a 3-dimensional skeleton-like structure between the retained austenite and the martensite. This hard and finely ramified carbide network distributed throughout the entire ingot is a specific characteristic of this alloy and important for its excellent mechanical properties. The material exhibits extremely high engineering compression strength of almost 5500 MPa combined with a large compression strain of about 23% due to deformation-induced martensite formation. Furthermore, the alloy possesses a high hardness and tensile strength in the as-cast condition. This combination of mechanical properties leads to an outstanding engineering material for a variety of structural applications in the automotive and tool manufacturing industry.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-011-5794-z