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Fractal Characterization of the Fractured Surface of a Duplex Stainless Steel and Their Relation with the Strength and Ductility

Published online by Cambridge University Press:  02 July 2020

O. A. Hilders ,
L. Sáenz ,
N. Peña ,
M. Ramos ,
A. Quintero ,
R. Caballero  and
L. Berrío
O. A. Hilders
Affiliation:
Department of Materials and Fabrication Processes, University of Carabobo, Apartado Postal, 3155, Valencia 2002, Venezuela.
L. Sáenz
Affiliation:
School of Metallurgical Engineering and Materials Science, Central University of Venezuela, Apartado Postal, 47514, Caracas 1041-A, Venezuela.
N. Peña
Affiliation:
School of Metallurgical Engineering and Materials Science, Central University of Venezuela, Apartado Postal, 47514, Caracas 1041-A, Venezuela.
M. Ramos
Affiliation:
School of Metallurgical Engineering and Materials Science, Central University of Venezuela, Apartado Postal, 47514, Caracas 1041-A, Venezuela.
A. Quintero
Affiliation:
School of Metallurgical Engineering and Materials Science, Central University of Venezuela, Apartado Postal, 47514, Caracas 1041-A, Venezuela.
R. Caballero
Affiliation:
School of Metallurgical Engineering and Materials Science, Central University of Venezuela, Apartado Postal, 47514, Caracas 1041-A, Venezuela.
L. Berrío
Affiliation:
School of Metallurgical Engineering and Materials Science, Central University of Venezuela, Apartado Postal, 47514, Caracas 1041-A, Venezuela.
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Extract

Due to the very good combination of the most outstanding properties of ferrite and austenite, the microstructure of duplex stainless steels allows them to obtain high strength and toughness levels even at low temperatures . As a result of these combined effects, duplex stainless steels have become very popular for many applications . In practice, the prolonged use of these materials at temperatures below approximately 500°C may cause an embrittlement of the ferrite phase, which has been called 475°C embrittlement. Thus, the isothermal aging at 475°C can be exploited to produce a variety of strength values associated with the corresponding decreases in ductility and variations of the fractal dimension of the fracture surfaces. No experimental measurements of the fractal dimension - tensile properties relationships are available for many commercial metallic alloys, then, the present experiments on a duplex stainless steel were conducted to show that the fractal dimension, D, many be used as a characterization parameter in fracture morphology - mechanical properties studies.

Type
Scanning Electron Microscopy
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 766 - 767
Copyright
Copyright © Microscopy Society of America

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References

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