Research Papers

Thermal and Microstructure Study of the Chip Formation During Turning of Ti64 β Lamellar Titanium Structure

[+] Author and Article Information
Vincent Wagner

Laboratoire Génie de Production (LGP)
Université de Toulouse,
Tarbes 65000, France
e-mail: vincent.wagner@enit.fr

Floran Barelli

HAM France Andreas Maier,
Chemin de la Forêt,
Peillonnex 74250, France

Gilles Dessein

Laboratoire Génie de Production (LGP)
Université de Toulouse,
Tarbes 65000, France

Raynald Laheurte, Phillipe Darnis, Olivier Cahuc

Université de Bordeaux,
CNRS, I2M Bordeaux,
351 cours de la Libération,
Talence F-33400, France

Michel Mousseigne

Institut Clément Ader (ICA),
Université de Toulouse,
3 rue Caroline Aigle,
Toulouse 31400, France

1Corresponding author.

Manuscript received June 9, 2017; final manuscript received November 20, 2017; published online December 21, 2017. Assoc. Editor: Guillaume Fromentin.

J. Manuf. Sci. Eng 140(3), 031010 (Dec 21, 2017) (10 pages) Paper No: MANU-17-1363; doi: 10.1115/1.4038597 History: Received June 09, 2017; Revised November 20, 2017

In recent years, many titanium alloys have emerged, each of them associated with a range of different heat treatments. Thus, several microstructures have been studied to varying degrees. For example, the Ti64 titanium alloy, mostly known for its α + β structure, can display a different state: the structure, inducing nonstandard mechanical behavior. This work presents chip formation in this specific microstructure where a strong heterogeneity is observed and where the shear band formation is a function of the relationship between the shear direction and the microstructure orientation. From these reasons, major differences are found in the chip morphology, within the same cutting condition, in comparison to the bimodal structure where a single chip morphology is obtained for each cutting condition. A section of this paper is devoted to the presentation of the β microstructure where different configurations can be seen within the same chip. Next, the influence of cutting conditions on the chip formation is studied. To highlight the specific chip formation process, a temperature model has been developed and combined with cutting force analysis to understand clearly the specificity of the chip formation for this structure. Finally, the discussion explains the different chip formation scenarios according to the workpiece microstructure to be cut.

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Fig. 1

Chip formation during Ti5553 turning [8]

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Fig. 2

Heat treatment of titanium alloy (a) and Ti64 β microstructure (b)

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Fig. 3

Chip morphology for Ti64 β

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Fig. 4

First configuration

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Fig. 5

Second configuration

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Fig. 6

Third configuration

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Fig. 7

Fourth configuration

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Fig. 8

Cutting forces for all cutting conditions

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Fig. 9

Chip formation and model used for cutting temperatures

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Fig. 10

Evolution of temperature for each shearing band when Vc = 65 m/min and tu = 0, 16 mm

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Fig. 11

Chip formation Ti64 β structure

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Fig. 12

Effect of feed on chip formation




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