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Effect of Structure on Properties of Incrementally Formed Titanium Alloy Sheets

Authors: Petr Homola, Lucie Novakova, Vaclav Kafka

Abstract:

Asymmetric incremental sheet forming (AISF) could significantly reduce costs incurred by the fabrication of complex industrial components with a minimal environmental impact. The AISF experiments were carried out on commercially pure titanium (Ti-Gr2), Timetal (15-3-3-3) alloy, and Ti-6Al-4V (Ti-Gr5) alloy. A special testing geometry was used to characterize the titanium alloys properties from the point of view of the forming zone and titanium structure effect. The structure and properties of the materials were assessed by means of metallographic analyses and microhardness measurements.The highest differences in the parameters assessed as a function of the sampling zone were observed in the case of alpha-phase Ti-Gr2at the expense of the most substantial sheet thinning occurrence. A springback causes a smaller stored deformation in Timetal (β alloy) resulting in less pronounced microstructure refinement and microhardness increase. Ti-6Al-4V alloy exhibited early failure due to its poor formability at ambient temperature.

 

Keywords: Hardness, Titanium Alloys, incremental forming, metallography

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1090942

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References:


[1] M. J. Donachie, Titanium–A Technical Guide. 2nd ed,ASM,2000, ch1.
[2] R.R. Boyer,"An Overview on the Use of Titanium in the Aerospace Industry,”Mater. Sci. Eng., vol. A 213, pp. 103 – 114, Aug. 1996.
[3] I. J. Polmear, Light Alloys – from Traditional Alloys to Nanocrystals. 4th ed., Elsevier, 2006, ch. 1.
[4] M. Niinomi, "Mechanical Properties of Biomedical Titanium Alloys,” Mater. Sci. Eng., vol. A243, pp. 231–236, March 1998.
[5] Z. Okazaki et al., "Cytocompatibility of Various Metals and Development of New Titanium Alloys for Medical Implants,” Mater. Sci. Eng., vol. A243, pp. 250–256, March 1998.
[6] W.C. Emmens, G. Sebastiani, and A.H. van den Boogaard, "The technology of Incremental Sheet Forming – A Brief Review of the History,” J. Mater. Process. Tech., vol. 201/8, pp. 981–997, June 2010.
[7] G. Hirt, et al., "Forming Strategies and Process Modelling for CNC Incremental Sheet Forming,” CIRP Ann. Manuf. Technol., vol. 53, pp. 203–206, Jan. 2004.
[8] B.T. Araghi, et al., "Investigation into a New Hybrid Forming Process: Incremental Sheet Forming Combined with Stretch Forming,” CIRP Ann. Manuf. Technol., vol. 58, pp. 225–228, Jan. 2009.
[9] K. Jackson, and J. Allwood, "The Mechanics of Incremental Sheet Forming,” J.Mater. Process. Tech., vol. 209, pp. 1158–1174, Feb. 2009.
[10] J. Jeswiet, "Asymmetric Incremental Sheet Forming,” Adv. Mater. Res., vol. 6-8, pp. 35–58, May. 2005.
[11] Z. Liu, Y. Li, and P.A. Meehan, "Experimental Investigation of Mechanical Properties, Formability and Force Measurement for AA7075-O Aluminum Alloy Sheets Formed by Incremental Forming,” Int.J.Precis. Eng. Manuf., vol. 14, pp. 1891–1899, Nov. 2013.
[12] Q. Zhang et al., "Influence of Anisotropy of the Magnesium Alloy AZ31 Sheets on Warm Negative Incremental Forming,” J. Mater. Process. Tech., vol. 209, pp. 5514–5520, Jan.
[13] L. Novakova, P. Homola, V. Kafka, "Microstructure Analysis of Titanium Alloys after Deformation by Means of Asymmetric Incremental Sheet Forming,” Manuf. Technol., vol. 12, No. 13, pp. 201–206, Dec. 2012.
[14] G. Lutjering, "Influence of Processing on Microstructure and Mechanical Properties of (ab) Titanium Alloys,” Mater. Sci. Eng., vol. A243, pp. 32–45, March 1998.