Research Papers

Identification of Material Constitutive Laws Representative of Machining Conditions for Two Titanium Alloys: Ti6Al4V and Ti555-3

[+] Author and Article Information
G. Germain

e-mail: guenael.germain@ensam.eu

A. Morel

e-mail: anne.morel@ensam.eu
Arts et Métiers ParisTech,
2 Bd de Ronceray,
Angers, 49000France

T. Braham-Bouchnak

IUT Nantes, IRCCyN,
2 avenue du Professeur Jean Rouxel,
Carquefou, 44475France
e-mail: tarek.braham-bouchnak@univ-nantes.fr

Contributed by the Materials Division of ASME for publication in the Journal of Engineering Materials and Technology. Manuscript received May 22, 2012; final manuscript received January 17, 2013; published online May 2, 2013. Assoc. Editor: Georges Cailletaud.

J. Eng. Mater. Technol 135(3), 031002 (May 02, 2013) (11 pages) Paper No: MATS-12-1104; doi: 10.1115/1.4023674 History: Received May 22, 2012; Revised January 17, 2013

Determining a material constitutive law that is representative of the extreme conditions found in the cutting zone during machining operations is a very challenging problem. In this study, dynamic shear tests, which reproduce, as faithfully as possible, these conditions in terms of strain, strain rate, and temperature, have been developed using hat-shaped specimens. The objective was to identify the parameters of a Johnson–Cook material behavior model by an inverse method for two titanium alloys: Ti6Al4V and Ti555-3. In order to be as representative as possible of the experimental results, the parameters of the Johnson–Cook model were not considered to be constant over the total range of the strain rate and temperature investigated. This reflects a change in the mechanisms governing the deformation. The shear zones observed in hat-shaped specimens were analyzed and compared to those produced in chips during conventional machining for both materials. It is concluded that the observed shear bands can be classified as white-etching bands only for the Ti555-3 alloy. These white bands are assumed to form more easily in the Ti555-3 alloy due to its predominately β phase microstructure compared to the Ti6Al4V alloy with a α + β microstructure.

Copyright © 2013 by ASME
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Fig. 1

Microstructures of the two titanium alloys investigated (a) Ti555-3 and (b) Ti6Al4V

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Fig. 2

Shear zones created during the cutting process

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Fig. 3

Hat-shaped specimen

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Fig. 4

Force-displacement curves for different temperatures for (a) the Ti555-3 alloy and (b) the Ti6Al4V alloy

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Fig. 5

Force-displacement curves for different displacement rates for (a) the Ti555-3 alloy and (b) the Ti6Al4V alloy

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Fig. 6

Evolution of the maximum force as a function of displacement rate

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Fig. 7

Flow chart identification procedure of Johnson–Cook parameters

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Fig. 8

Experimental and numerical force-displacement curves for (a) the Ti555-3 alloy and (b) the Ti6Al4V alloy at ambient temperature and quasi-static strain rate

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Fig. 9

Evolution of the parameter m for the two titanium alloys as a function of temperature

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Fig. 10

Evolution of the parameter C pour for the two titanium alloys as a function of the strain rate

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Fig. 11

Comparison between the experimental and numerical force-displacement curves at different temperature for the Johnson–Cook model identified for Ti555-3 alloy (strain rate = 1 s−1)

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Fig. 12

Observation of white bands in ZI and ZII (Ti555-3, tool CP500, Vc = 90 m/min, f = 0.15 mm/rev)

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Fig. 13

Comparison between the shear zones created in a hat-shaped specimen and chips formed during machining (Ti555-3)

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Fig. 14

White band thickness as a function of the test temperature for hat-shaped specimens for the Ti555-3 alloy and a strain rate of 1 s−1

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Fig. 15

Phase percentages measured in the base metal and chips resulting from different machining conditions (Ti555-3)




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