0
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.

FIGURES IN THIS ARTICLE
<>
Copyright © 2013 by ASME
Your Session has timed out. Please sign back in to continue.

References

Toyserkani, E., and Khajepour, A., 2006, “A Mechatronics Approach to Laser Powder Deposition Process,” Mechatronics, 16(10), pp. 631–641. [CrossRef]
ScottJ., GuptaN., WemberC., NewsomS., WohlersT., and CaffreyT., 2012, “Additive Manufacturing: Status and Opportunities,” Science and Technology Policy Institute, Retrieved 11th March 2013, from https://www.ida.org/stpi/occasionalpapers/papers/AM3D_33012_Final.pdf
MahamoodM. R., AkinlabiE. T., ShuklaM., and PityanaS., 2012, “Effect of Laser Power on Material Efficiency, Layer Height and Width of Laser Metal Deposited Ti6Al4V,” Proceedings of the World Congress on Engineering and Computer Science 2012, Vol. II, WCECS 2012, Oct. 24–26, San Francisco, pp. 1433–1438.
Yamashita, K., Taniguchi, H., Yuyama, S., Oe, K., Sun, J., and Mataki, H., 2007, “Continuous-Wave Stimulated Emission and Optical Amplification in Europium (III)-Aluminum Nanocluster-Doped Polymeric Waveguide,” Appl. Phys. Lett., 91(8), pp. 081115–081118. [CrossRef]
Thivillon, L., Bertrand, Ph., Laget, B., and Smurov, I., 2009, “Potential of Direct Metal Deposition Technology for Manufacturing Thickfunctionally Graded Coatings and Parts for Reactors Components,” J. Nucl. Mater., 385, pp. 236–241. [CrossRef]
Wang, F., Mei, J., and Wu, X., 2007, “Compositionally Graded Ti6Al4V + TiC Made by Direct Laser Fabrication Using Powder and Wire,” Mater. Des., 28(7), pp. 2040–2046. [CrossRef]
Bergan, P., 2000, “Implementation of Laser Repair Processes for Navy Aluminum Components,” Proceeding of Diminishing Manufacturing Sources and Material Shortages Conference, 2000 (DMSMS), last accessed on March 17, 2013, http://smaplab.ri.uah.edu/Smaptest/Conferences/dmsms2K/papers/decamp.pdf
Brandl, E., SchoberthA., and Leyens, C., 2012, “Morphology, Microstructure, and Hardness of Titanium (Ti-6Al-4V) Blocks Deposited by Wire-Feedadditive Layer Manufacturing (ALM),” Mater. Sci. Eng. A, 532, pp. 295–307. [CrossRef]
Peters, M., Kumpfert, J., Ward, C. H., and Leyens, C., 2003, “Titanium Alloys for Aerospace Applications, in Titanium and Titanium Alloys,” Adv. Eng. Mater., 5, pp. 419–427. [CrossRef]
Lu, Y.,Tang, H. B., Fang, Y. L., Liu, D., and Wang, H. M., 2012, “Microstructure Evolution of Sub-Critical Annealed Laser Deposited Ti–6Al–4V Alloy,” Mater. Des., 37, pp. 56–63. [CrossRef]
MachadoA. R., and WallbankJ., 2005, “Machining of Titanium and Its Alloys: A Review,” Proc. Inst. Mech. Eng. Part B, 204(11), pp. 53–60. [CrossRef]
SammonsP. M., BristowD. A., and LandersR. G., 2013, “Height Dependent Laser Metal Deposition Process Modeling,” ASME J. Manuf. Sci. Eng.,” 135(5), p. 054501. [CrossRef]
Brandl, E., Michailov, V., Viehweger, B., and Leyens, C., 2011 “Deposition of Ti–6Al–4V Using Laser and Wire, Part I: Microstructural Properties of Single Beads,” Surf. Coat. Technol., 206(6), pp. 1120–1129. [CrossRef]
Kobryn, P., and Semiatin, S. L., 2000, “Laser Forming of Ti–6Al–4V: Research Overview,” D.Bourell, J.Beaman, R.Crawford, J.Marcus, and J.Barlow, eds., Solid Freeform Fabrication Proceedings, University of Texas, Austin, TX, pp. 58–65.
Senthilkumaran, K., Pandey, P. M., and Rao, P. V. M., 2009, “Influence of Building Strategies on the Accuracy of Parts in Selective Laser Sintering,” Mater. Des., 30(8), pp. 2946–2954. [CrossRef]
British Standards Institute, 1998, “GPS—Surface Texture: Profile Method—Rules and Procedures for the Assessment of Surface Texture,” BS EN ISO 4288.
Taylor, B., and Weidmann, E., 2008, “Metallographic Preparation of Titanium,” Struers Application Notes, last accessed on Jan. 24, 2013, http://www.struers.com/resources/elements/12/104827/Application_Note_Titanium_English.pdf
ASTM, 2011, “Standard Test Method for Knoop and Vickers Hardness of Materials,” ASTM E384—11e1.
Mahamood, M. R., Akinlabi, E. T., Shukla, M., and Pityana, S., 2013, “Scanning Velocity Influence on Microstructure, Microhardness and Wear Resistance Performance on Laser Deposited Ti6Al4V/TiC Composite,” Mater. Des., 50, pp. 656–666. [CrossRef]
Wu, X., Liang, J., Mei, J., Mitchell, C., Goodwin, P. S., and Voice, W., 2004, “Microstructures of Laser-Deposited Ti–6Al–4V,” Mater. Des., 25(2), pp. 137–144. [CrossRef]

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

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In