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Technical Briefs

Molecular Dynamics Study of Laser and Plasma Nitriding of Titanium

[+] Author and Article Information
Hanjiang Yu

e-mail: yhj_01@yahoo.cn

Ying An

Liaoning Key Laboratory of Photoelectronic Devices and Detection Technology,
Department of Physics,
Liaoning University,
Shenyang 110036, China

Fengjiu Sun

College of Sciences,
Northeastern University,
Shenyang 110004, China

1Corresponding author.

Contributed by the Manufacturing Engineering Division of ASME for publication in the Journal of Manufacturing Science and Engineering. Manuscript received May 19, 2011; final manuscript received May 10, 2012; published online May 24, 2013. Assoc. Editor: Yong Huang.

J. Manuf. Sci. Eng 135(3), 034501 (May 24, 2013) (4 pages) Paper No: MANU-11-1183; doi: 10.1115/1.4023709 History: Received May 19, 2011; Revised May 10, 2012

The molecular dynamics (MD) method is successfully applied to simulate the nitridation of titanium by the mixing technology with laser and plasma. Based on the simulation, the influence of the processing parameters, such as the laser power density and the scanning velocity on the effective thickness of the nitride layer, was investigated. It was found that, for each scanning velocity, there is a laser power density range within which the higher laser power density has the beneficial effect for nitriding treatment. Comparing the simulation and experimental results shows that the calculated results are in good qualitative agreement with the experimental results.

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Figures

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Fig. 1

Schematic diagram of the LPN apparatus

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Fig. 2

The initial energy distribution of the incident particle (N2+)

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Fig. 3

Spatial distribution of the nitrogen inside the titanium substrate treated at a laser power density of 1.0 × 106 W/cm2 and a scanning velocity of 200 mm/min

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Fig. 4

Evolution of nitrogen depth profiles for the scanning velocities of 100, 200, and 500 mm/min ((a), (b), and (c), respectively). Curves 1–6 correspond to laser power density of 0.2 × 106, 0.4 × 106, 0.6 × 106, 0.8 × 106, 1.0 × 106, and 1.2 × 106 W/cm2, respectively.

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Fig. 5

The effective thickness of the nitrided layer as a function of laser power density for different scanning velocity

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Fig. 6

Comparison of the experimental nitrogen depth profile and the MD simulation result at a laser power density of 1.0 × 106 W/cm2 and a scanning velocity of 200 mm/min

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Fig. 7

SEM images of samples treated at laser power density of 0.2 × 106 W/cm2 and a scanning velocity of 200 mm/min

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