Laser Treatment of Rene-41: Thermal and Microstructural Analysis

Yilbas, B. S.; Akhtar, Syed Sohail; Karataş, C.

doi:10.1115/1.4024289

Cited by 7 publications

(3 citation statements)

References 10 publications

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“…In the case of a moving heat source along the x-axis with a constant velocity U (Fig. 1), the Fourier heat transfer equation, for the laser heating process, can be written as follows [20]:…”

Section: Mathematical Analysismentioning

confidence: 99%

Laser treatment of aluminum composite and investigation of thermal stress field

Yilbaş

Akhtar

Karataş

et al. 2016

Int J Adv Manuf Technol

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Laser surface melting of hot pressed aluminum composite tile, consisting of 90 % aluminum and 10 % WC, is carried out. Temperature and stress fields developed in the laser-treated region are modeled and predicted using ABAQUS finite element code in line with the experimental conditions. The spiral motion of the laser beam is incorporated at the surface during the laser scanning. This arrangement provides self-annealing effect on the initially formed laser scanning tracks through heat conduction from the lately formed laser scanning tracks. Surface temperature predictions are validated through the thermocouple data. Morphological and metallurgical changes in the laser-treated layer are examined using optical and electron scanning microscopes. It is found that the cooling rates in the central region of the workpiece remain low because of the self-annealing effect of the lately formed laser scanning tracks. This, in turn, lowers von Mises stress levels in this region. Stress peaks are formed below the surface because of the high thermal strain formed in this region during the cooling cycle. The spiral scanning of the laser beam causes oscillating stress levels in the surface region of the laser-treated layer; in which case, its amplitude reduces with the progressing time. Laser-treated layer is free from cracks and crack networks, which is associated with the self-annealing effect of the lately formed laser scanning tracks.

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Section: Mathematical Analysismentioning

confidence: 99%

Laser treatment of aluminum composite and investigation of thermal stress field

Yilbaş

Akhtar

Karataş

et al. 2016

Int J Adv Manuf Technol

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“…As received surface 390 -Laser nitrided surface [17] 460 À680 TiC and laser-treated [18] 520 À850 SiC and laser-treated 500 À720 B 4 C and laser-treated 610 À890 Figure 4. X-ray diffractogram for laser-treated surfaces.…”

Section: Microhardness (Hv) Residual Stress (Mpa)mentioning

confidence: 99%

“…Although laser treatment of Rene 41 high‐performance alloy was investigated previously, the analyses were limited to gas assisted nitriding and boron carbide injection at the surface. The influence of other carbide particles, such as B 4 C and SiC particles, on microstructure and residual stress was left obscure when these particles were injected at the surface during the laser treatment process.…”

Section: Introductionmentioning

confidence: 99%

Characterization of laser‐treated Rene 41 surface due to B₄C and SiC particles at surface prior to laser treatment

Yilbaş

2013

Surface & Interface Analysis

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Laser surface treatment of Rene 41 high‐performance alloy is carried out with the presence of hard particles at the surface. B4C and SiC particles are uniformly distributed within 40 µm carbon film at the workpiece surface prior to laser treatment process. The effect of hard particles on residual stress and microhardness variations is investigated at the treated surface. Morphological and metallurgical changes in the treated layer are examined by using electron microscopy, energy dispersive spectroscopy, and X‐ray diffraction. Residual stress formed at the surface is determined from the X‐ray data. It is found that the treated surface is free from asperities such as large size voids and cracks. A dense layer is formed in the surface region, which causes volume shrinkage while contributing to microhardness and residual stress enhancement at the surface. B4C hard particles result in the highest residual stress and microhardness at the surface, which is attributed to its high thermal expansion coefficient. Copyright © 2013 John Wiley & Sons, Ltd.

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