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New Phenokena in Electron Beam Glazing

Published online by Cambridge University Press:  21 February 2011

P. R. Strutt ,
J. LeMAY  and
A. Tauqir
P. R. Strutt
Affiliation:
Metallurgy Department, University of Connecticut, Storrs, CT 06268
J. LeMAY
Affiliation:
Metallurgy Department, University of Connecticut, Storrs, CT 06268
A. Tauqir
Affiliation:
Metallurgy Department, University of Connecticut, Storrs, CT 06268
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Abstract

Linear heat source surface melting studies have been carried out using a 1 to 15 kH oscillating beam incident on a steel substrate to produce a 3 to 35mm wide rapidly solidified strip of material at rates ranging from 1 to 100 cm.s−1. A simple relationship betweenmelt depth, power, and substrate velocity (V) has been determined at low values of V; limited results at higher velocities appear to follow the same relationship. A serendipitous discovery was the effect of prior surface homogenization treatment on the geometrical and microstructural uniformity of the subsequently formed rapidly solidified layers. This pre-treatment resulted in the formation of thin layers of uniform thickness under the most rapid processing condition (V = 100 cm.s−l). Omission of pre-treatnent resulted in irregular and sometimes discontinuous surface layers. In the case of a high speed steel of near peritectic composition (M2)pre-treatment resulted in the almost complete elimination of massive austenitic region within the dominant ferrite phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 28: Symposium F – Rapidly Solidified Metastable Materials , 1983 , 87
Copyright
Copyright © Materials Research Society 1984

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References

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