ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Laser materials processing has been widely applied in industrial processes due to uniqueprecision and very localized thermal action furnished by the laser’s high energy density and powercontrollability. With the inherent rapid heating and cooling rates to which this surface layer issubjected, this process provides an opportunity to produce different microstructures from that of thebulk metal leading to useful properties. The aim of this work is to develop a heat transfermathematical model based on the finite difference method in order to simulate temperature fields inthe laser surface remelting process. Convective heat transfer in the remelted pool is taken intoaccount by using the effective thermal conductivity approach. Theoretical predictions furnished byprevious models from the literature were used for validation of numerical simulations performedwith the proposed model. Experiments of laser surface remelting of Al-9 wt pct Si samples wascarried out in the present investigation, and numerical simulations was applied for the laser machineoperating parameters. The work also encompasses the analysis of microstructural andmicrohardness variations throughout the resulting treated and unmolten zones
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.587-588.721.pdf
Permalink
