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Technical Briefs

Characterizing the Effect of Laser Power Density on Microstructure, Microhardness, and Surface Finish of Laser Deposited Titanium Alloy

[+] Author and Article Information
Rasheedat M. Mahamood

Department of Mechanical Engineering Science,
University of Johannesburg,
Auckland Park Kingsway Campus,
Johannesburg 2006, South Africa
Department of Mechanical Engineering,
University of Ilorin,
P.M.B. 1515, Ilorin,
Kwara State, Nigeria
e-mail: mahamoodmr2009@gmail.com and mahamoodmr@unilorin.edu.ng

Esther T. Akinlabi

Department of Mechanical Engineering Science,
University of Johannesburg,
Auckland Park Kingsway Campus,
Johannesburg 2006, South Africa
e-mail: etakinlabi@uj.ac.za

Mukul Shukla

Department of Mechanical Engineering Technology,
University of Johannesburg,
Doornfontein Campus,
Johannesburg 2006, South Africa
Department of Mechanical Engineering,
MNNIT Allahabad,
Uttar Pradesh 211004, India
e-mail: mshukla@uj.ac.za

Sisa Pityana

National Laser Centre,
Council for Scientific and Industrial Research (CSIR),
Pretoria 0001, South Africa
e-mail: SPityana@csir.co.za

1Corresponding author.

Manuscript received April 1, 2013; final manuscript received October 15, 2013; published online November 7, 2013. Assoc. Editor: Yung Shin.

J. Manuf. Sci. Eng 135(6), 064502 (Nov 07, 2013) (4 pages) Paper No: MANU-13-1130; doi: 10.1115/1.4025737 History: Received April 01, 2013; Revised October 15, 2013

This paper reports the effect of laser power density on the evolving properties of laser metal deposited titanium alloy. A total of sixteen experiments were performed, and the microstructure, microhardness and surface roughness of the samples were studied using the optical microscope (OP), microhardness indenter and stylus surface analyzer, respectively. The microstructure changed from finer martensitic alpha grain to coarser Widmastätten alpha grain structure as the laser power density was increased. The results show that the higher the laser power density employed, the smoother the obtained surface. The microhardness initially increased as the laser power density was increased and then decreased as the power density was further increased. The result obtained in this study is important for the selection of proper laser power density for the desired microstructure, microhardness and surface finish of part made from Ti6Al4V.

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References

Figures

Grahic Jump Location
Fig. 1

SEM micrograph of (a) Ti6Al4V powder and (b) Ti6Al4V substrate [19]

Grahic Jump Location
Fig. 2

Micrograph of samples at laser density of (a) 18 J/mm2, (b) 50 J/mm2, and (c) 240 J/mm2

Grahic Jump Location
Fig. 3

The plot of the Variation of (a) microhardness and (b) surface roughness against laser power density

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