The Influence of Mixing Enthalpy on the Geometric Properties of Laser Solid Formed Ti-6Al-4V

Abstract:

Ti-6Al-4V alloy samples were deposited by laser solid forming from blended 90wt%Ti+6wt%Al+4wt%V powders and from pre-alloyed Ti-6Al-4V powders under the same processing parameters, and the geometric properties of the deposited samples were studied comparatively. It was found that the height and the width of the deposited layers increased with the increase of the laser power and the decrease of the laser scanning velocity. Meanwhile, the height and the width of the deposited layer obtained from blended elemental powders are much higher than that from pre-alloyed powders. The mixing enthalpy for Ti-6Al-4V was calculated by using the Miedema model and the Toop model, and it was found that the alloying process for Ti, Al and V in the molten pool is exothermic, which is responsible for the higher deposited layer height and width of LSF Ti-6Al-4V from blended elemental powders due to the higher energy in the molten pool and the higher temperature of the molten pool.

• Periodical: Advanced Materials Research (Volumes 690-693)
• Pages: 3343-3349
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.690-693.3343
• Online since: May 2013
• Authors: Feng Ying Zhang, Hua Tan, Hong Chen, Guang Sheng Liang
• Keywords: Geometric Property, Laser Solid Forming, Mixing Enthalpy, Ti6Al4V

References

[1] Hua Tan, JingChen, FengyingZhang et al. Process analysis for laser solid forming of thin-wall structure. Int J Mach Tool Manu. Vol. 50 (2010), p.1.

[2] P. C. Collins, R. Banerjee, S. Banerjee et al. Laser Deposition of Compositionally Graded Titanium-Vanadium and Titanium-Molybdenum Alloys. Mater Sci Eng A. Vol. 352(1-2) (2003), p.118.

DOI: 10.1016/s0921-5093(02)00909-7

[3] R. Banerjee, P. C. Collins, D. Bhattacharyya et al. Microstructural Evolution in Laser Deposited Compositionally Graded α/β Titanium-Vanadium Alloys. Acta Mater. Vol. 51(11) (2003), p.3277.

DOI: 10.1016/s1359-6454(03)00158-7

[4] R. Banerjee, D. Bhattacharyya, P. C. Collins et al. Precipitation of Grain Boundary α in A Laser Deposited Compositionally Graded Ti-8Al-xV Alloy-An Orientation Microscopy Study. Acta Mater. Vol. 52(2) (2004), p.377.

DOI: 10.1016/j.actamat.2003.09.038

[5] R. Banerjee, P. C. Collins, A. Gen et al. Direct Laser Deposition of In Situ Ti-6Al-4V-TiB Composites. Mater Sci Eng A. Vol. 358(1-2) (2003), p.343.

DOI: 10.1016/s0921-5093(03)00299-5

[6] A. Gen, R. Banerjee, D. Hill et al. Structure of TiB Precipitates in Laser Deposited In Situ Ti-6Al-4V-TiB Composites. Mater Letter. Vol. 60(7) (2006), p.859.

DOI: 10.1016/j.matlet.2005.10.033

[7] S. Nag, R. Banerjee, H. L. Fraser. A Novel Combinatorial Approach for Understanding Microstructural Evolution and Its Relationship to Mechanical Properties in Metallic Biomaterials. Acta Biomater. Vol 3(3) (2007), p.369.

DOI: 10.1016/j.actbio.2006.08.005

[8] R. Banerjee, S. Nag, H. L. Fraser. A Novel Combinatorial Approach to the Development of Beta Titanium Alloys for Orthopaedic Implants. Mater Sci Eng C. Vol. 25(3) (2005), p.282.

DOI: 10.1016/j.msec.2004.12.010

[9] P. C. Collins, R. Banerjee, H. L. Fraser. The Influence of the Enthalpy of Mixing During The Laser Deposition of Complex Titanium Alloys Using Elemental Blends. Scr Mater. Vol. 48(10) (2003), p.1445.

DOI: 10.1016/s1359-6462(03)00081-2

[10] Zhang B W, in: Theory of Embedded Atom Method and Its Application to Materials Science: Atomic Scale Materials Design Theory, edtied by Hunan University Press, Changsha, (2003).

[11] Tan Hua, Chen Jing, Lin Xin, Zhang Fengying, Huang Weidong. Research on molten pool temperature in the process of laser rapid forming. J Mater Pro Tech. Vol. 198(1)(2008), p.454

DOI: 10.1016/j.jmatprotec.2007.06.090