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Microstructural Study and Thermal Modeling of Laser Formed Ti-6Al-4V

Published online by Cambridge University Press:  17 March 2011

S.M. Kelly  and
S.L. Kampe
S.M. Kelly
Affiliation:
Materials Science and Engineering Department, Virginia Tech, Blacksburg, VA 24061-0237
S.L. Kampe
Affiliation:
Materials Science and Engineering Department, Virginia Tech, Blacksburg, VA 24061-0237
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Abstract

A two-dimensional thermal model for a commercial laser additive manufacturing (LAM) process has been developed to predict the thermal history of Laser Formed Ti-6Al-4V single line (rib-on-web) builds. The thermal model has been developed to assist in the prediction and interpretation of the as-processed microstructure, which evolves as a result of the complex thermal history that develops as a result of the deposition of multiple layers of material. In the current work, the model is used to show that the presence of layer bands is a result of different regions in the build experiencing varying super b transus time, temperature, and cooling rate conditions within different regions in the build.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 698: Symposia Q/EE Electroative Polymers and Rapid Prototyping , 2001 , Q3.8.1
Copyright
Copyright © Materials Research Society 2002

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References

REFERENCES

1 AeroMet Corporation Web Site: http://www.aerometcorp.comGoogle Scholar
2 Cooper, K.P., “Building Components by Laser-Additive Manufacture,” JOM 53(9) p. 29, 2001.Google Scholar
3 Griffith, M.L., Keicher, D.M., Atwood, C.L., Romero, J.A., Smugeresky, J.E., Harwell, L.D., and Greene, D.L., “Freeform Frabrication of Metallic Components Using Laser Engineered Net Shaping (LENS),” in Proc. Of the Solid Freefrom Fabrication Symposium (University of Texas at Austin, 1996) pp. 125.Google Scholar
4 Lewis, G.K., Schlienger, E., “Practical Considerations and Capabilities for Laser Assisted Direct Metal Deposition,” Materials and Design 21 pp. 417–423, 2000.Google Scholar
5 Arcella, F.G. and Froes, F.H., “Producing Titanium Aerospace Components from Powder Using Laser Forming,” JOM 52(5), pp. 28–30, 2000.Google Scholar
6 Kelly, S.M., Kampe, S.L., Crowe, C.R., “Microstructural Study of Laser Formed Ti-6Al-4V,” in Solid Freeform and Additive Fabrication, edited by Danforth, S.C., Dimos, D., Prinz, F.B., (Mater. Res. Soc. Proc. 625, Warrendale, PA, 2000) pp. 3–8.Google Scholar
7 Kobryn, P.A. and Semiatin, S.L., “Laser Forming of Ti-6Al-4V: Research Overview,” in Solid Freeform Fabrication Proceedings, eds. Bourell, D.L., Beaman, J.J., Crawford, R.H., Marcus, H.L., Barlow, J.W. (University of Texas at Austin, 2000), pp. 58–65.Google Scholar
8 Kobryn, P.A. and Semiatin, S.L., “The Laser Additive Manufacture of Ti-6Al-4V,” JOM 53(9) pp. 40–2, 2001.Google Scholar
9 Beuth, J. and Klingbeil, N., “The Role of Process Variables in Laser-Based Direct Metal Solid Freeform Fabrication,” JOM 53(9) pp. 36–9, 2001.Google Scholar
10 Griffith, M.L., Ensz, M.T., Puskar, J.D., Robino, C.V., Brooks, J.A., Philliber, J.A., Smugeresky, J.E., and Hofmeister, W.H., “Understanding the Microstructure and Properties of Components Fabricated by Laser Engineered Net Shaping (LENS),” Solid Freeform and Additive Fabrication - 2000, MRS Symposium Proc. 625, eds. Danforth, S.C., Dimos, D., and Prinz, F.B., (MRS, Warrendale PA, 2000) pp. 9–20.Google Scholar
11 Hofmeister, W.H., Griffith, M.L., Ensz, M.T., and Smugeresky, J.E., “Solidification in Direct Metal Deposition by LENS Processing,” JOM 53(9) pp. 30–4 2001.Google Scholar
12 Griffith, M.L., Schlienger, M.E., Harwell, L.D., Oliver, M.S., Baldwin, M.D.. Ensz, M.T., Essien, M., Brooks, J., Robino, C.V., Smugeresky, J.E., Hofmeister, W.H., Wert, M.J., and Nelson, D.V.. “Understanding the Thermal Behavior in the LENS Process,” Materials and Design, 20, pp. 107–113, 1999.Google Scholar
13 ik, M. N. Özi, Finite Difference Methods in Heat Transfer, (CRC, Ann Arbor, 1994).Google Scholar
14 Boyer, R., Welsch, G., and Collings, E.W., eds. Materials Properties Handbook: Titanium Alloys, (ASM International, Materials Park, IH, 1994). pp. 513–6.Google Scholar
15 Chesnutt, J.C., Rhodes, C.G., and Williams, J.C., “Relationship Between Mechanical Properties, Microstructure, and Fracture Topography in a+b Titanium Alloys,” Fractography–Microscopic Cracking Processes, STP No. 600, (American Society for Testing and Materials), pp. 99–138 (1976); reprinted in Titanium and Titanium Alloys, edited by M.J. Donachie (American Society for Metals, Materials Park, OH, 1982) pp. 100-39.Google Scholar