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Transient self-dewetting of steels after pulsed electron beam melting

Published online by Cambridge University Press:  31 January 2011

N. Mingolo ,
A. N. Roviglione  and
O. E. Marti´nez
N. Mingolo
Affiliation:
Facultad de Ingenieri´a de la Universidad de Buenos Aires, Paseo Colón 850, Buenos Aires, Argentina
A. N. Roviglione*
Affiliation:
Facultad de Ingenieri´a de la Universidad de Buenos Aires, Paseo Colón 850, Buenos Aires, Argentina
O. E. Marti´nez*
Affiliation:
Facultad de Ciencias Exactas y Naturales de la Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, Argentina
*
a)arovigl@tron.fi.uba.ar
b)oem@df.uba.ar
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Abstract

Experimental evidence of transient self-dewetting of metallic surfaces is presented. Steel surfaces are melted by a pulsed electron gun, and the subsequent fast cooling against its substrate gives rise to the formation of characteristic patterns that we attribute to the dewetting of the liquid film. The patterns formed are similar to those obtained by spinodal dewetting, that is, when the dewetting action develops from a nonlinear instability on the liquid surface, and not from holes nucleation. High-purity iron does not show a similar behavior, indicating that the origin of the instability is due to the influence of the sulfur in the temperature dependence of the surface tension of the melt, which gives rise to a Be’nard-Marangoni instability.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 8 , August 2001 , pp. 2343 - 2349
Copyright
Copyright © Materials Research Society 2001

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