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Phase transformations in Fe-Mn alloys with nanosecond iodine laser pulses
Luleå tekniska universitet.
1994 (English)In: Intense beams and applications: lasers, ions and microwaves : Conference : Papers / [ed] William E. McDermott, Bellingham, Wash: SPIE - International Society for Optical Engineering, 1994Conference paper, Published paper (Refereed)
Abstract [en]

If a short laser pulse with high intensity is focused on the surface of a target in vacuum, it causes a nearly instantaneous vaporization of a limited volume of material. The rapid expansion of this material vapor produces an impact at the surface. The shock wave propagates and is absorbed in the material. In certain alloys, this causes work hardening, an increase in dislocation density, and phase transformations. While most material is vaporized, some surface melting occurs. The rate of re-solidification of the molten material is such that an almost completely amorphous structure results. The martensitic transformation in the solid target has been confirmed by using optical and transmission electron microscopy and by electromagnetic detection techniques. An iodine photodissociation laser emitting at the wavelength of 1315 nm was used for the experiments. The pulse length was typically 1 ns and the pulse energy could be varied between 1 and 30 Joules. The energy and power density in the focused spot were larger than 3 X 103 Jcm-2 and 3 X 1012 Wcm-2, respectively. Calculations of impact/momentum, peak pressure, and peak temperature were performed using the finite difference method with moving boundaries. The effects of the iodine laser pulses are compared with those of Q- switched Nd:YAG and ruby laser pulses.

Place, publisher, year, edition, pages
Bellingham, Wash: SPIE - International Society for Optical Engineering, 1994.
Series
Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X ; 2119
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-30573DOI: 10.1117/12.172709ISI: A1994BA43B00017Local ID: 46d14a80-fd6f-11db-b816-000ea68e967bISBN: 819414123 (print)OAI: oai:DiVA.org:ltu-30573DiVA, id: diva2:1003801
Conference
Intense Beams and Applications : 27/01/1994 - 28/01/1994
Note
Godkänd; 1994; 20070508 (cira)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-07-10Bibliographically approved

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Sarady, IstvanMagnusson, Claes

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CiteExportLink to record
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  • apa
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More styles
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  • nn-NO
  • nn-NB
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  • Other locale
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Output format
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