Technical Briefs

Laser Treatment of Rene-41: Thermal and Microstructural Analysis

[+] Author and Article Information
B. S. Yilbas

e-mail: bsyilbas@kfupm.edu.sa

Sohail Akhtar

Assistant Professor
e-mail: ssakhtar@kfupm.edu.sa
Department of Mechanical Engineering,
KFUPM Box 1913, Dhahran, 31261, Saudi Arabia

C. Karatas

Faculty of Engineering,
Hacettepe University,
Ankara, 06800, Turkey

Contributed by the Manufacturing Engineering Division of ASME for publication in the Journal of Manufacturing Science and Engineering. Manuscript received December 25, 2011; final manuscript received April 4, 2013; published online May 27, 2013. Assoc. Editor: Wei Li.

J. Manuf. Sci. Eng 135(3), 034502 (May 27, 2013) (4 pages) Paper No: MANU-11-1412; doi: 10.1115/1.4024289 History: Received December 25, 2011; Revised April 04, 2013

Laser treatment of Rene 41 surface is carried out at high pressure environment of nitrogen. Temperature and stress fields are predicted using abaqus finite element code. Metallurgical and morphological changes in the laser treated layer are examined using optical and scanning electron microscopes (SEM). The residual stress formed at the surface vicinity is obtained by X-ray diffraction (XRD) technique. It is found that the predictions of the residual stress agree well with the results obtained from the XRD technique. Cellular or cellular dendritic structures with fine secondary dendrites are formed in the laser treated surface due to high cooling rates. In addition, γ′ particles formed are generally in cubic morphology with varying sizes.

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Fig. 1

Thermocouple data and temperature predictions with time

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Fig. 2

Temperature variation along the x-axis for various cooling periods. The cooling period is started at t = 0.05.

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Fig. 3

von Mises stress variation along the x-axis for different cooling periods. The cooling period starts at t = 0.05 s.

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Fig. 4

von Mises stress contours inside the substrate material at the cooling cycle initiation

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Fig. 5

von Mises stress variation along z-axis for different cooling periods. The cooling cycle initiates at t = 0.05 s.

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Fig. 6

Cross section of the laser treated surface: (a) uniform treated layer with almost 40 μm thickness below the surface, (b) fine and dense cellular structures at the surface vicinity, (c) dendritic structure and short interdendritic arms, (d) γ′ phases below the treated surface, and (e) large grains at the vicinity of heat affected zone

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Fig. 7

XRD diffractogram for laser treated surface




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