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Experimental evaluation of technological strain formed during laser cladding of diesel engine valve seats

Bachelor thesis project: students applied and experimental physics

Laser cladding of diesel engine valve seats is one of the main applications for our scientific project: Optimisation of the microstructure and properties of laser deposited coatings. Besides searching for the best cladding material, proper geometry of laser cladding set-up and appropriate laser cladding parameters; the issue of generation of internal technological strains is very important due to elimination of any damage that may induce a failure during the service. Recently we have shown (Surface & Coatings Technology 203 (2009) 3189–3196) that 3D Digital Image Correlation (DIC) system Aramis is suitable tool to evaluate strain formed during laser cladding process.
Objective: The main aim of this project is to prove if DIC observations of the sample surface in the vicinity of laser track will provide information concerning strains generated during laser cladding. In the case of positive answer we would like to optimize the laser cladding parameters and cladding strategy with an aim to minimize the formation of high level internal strains.
Experimental techniques: Laser cladding experiments will be performed using the newest 3.3 kW Fiber laser system and DIC observations before and after laser cladding process will be realized and analyzed using the modern optical Aramis device.

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Fig: Strain history underneath of the center of the laser clad coating formed by overlapping of individual laser tracks. Laser cladding of Micromel23 powder with laser power 1750 W, laser beam scanning speed of 13.33 mm/s and powder feeding rate of 188 mg/s. a) Strain history during cladding first 5 laser tracks is shown in main plot, whereas tracks number 6, 7, 8 and 10 are depicted in the insert. b) Strain field in x direction after cladding of 9 laser tracks on a background real digital image. Positions of individual laser tracks are depicted by their numbers.


Contact:

Dr. Vasek Ocelik, kamer gebouw 13.017, e-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it , Phone: 050- 3633407
Prof.dr. J.Th.M. De Hosson, kamer gebouw 13.041, e-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it