Microstructure Alterations of Ti-6Al-4V ELI during Turning by Using Tungsten Carbide Inserts under Dry Cutting Condition

Ibrahim, G. A., Arinal, H., . Zulhanif, Haron, C.H.C.

Abstract


Titanium alloys possesses a hexagonal close packed (h.c.p) structure, called phase to ambient temperature. This structure changes to body center cubic (b.c.c), called phase to the temperature of 882 C. Machining process that generates high temperature during machining can affect on microstructures of machined surface, which represents as a quality of components. The turning parameters evaluated are cutting speed (55 - 95 m/min), feed rate (0.15 - 0.35 mm/rev), depth of cut (0.10 - 0.20 mm) and tool grade (uncoated, CVD and PVD). The aims of this paper are to investigate the effects of machining process on microstructures of machined surface and chip were machined using tungsten carbide inserts under dry cutting condition. The results show that machining at high cutting speed (95 m/min) affected on the microstructure significantly at the end of machining. The temperature is the most significant factor affected on microstructure of the machined surface and chip at shear zone. The changes of microstructure were also affected by the tool pressure during cutting. 

Keywords


Ti-6Al-4V ELI; microstructure; alteration; turning; carbide insert

Full Text:

PDF PDF

References


E.O. Ezugwu, , J. Booney, and Y. Yamane, “An overview of the machinability of aero engine alloys,” Journal of Material Processing and Technology, pp. 233-253, 2003.

E.O. Ezugwu, “Key improvement in the machining of difficult-to-cut aerospace Super alloys,” International Journal of Machine Tools & Manufacture, pp. 1353-1367, 2005.

E.O. Ezugwu, R.B. Da Silva, J. Bonney and A.R. Machado, “Evaluation of the performance of CBN tools when turning Ti-6Al-4V alloy with high pressure coolant supplies,” Journal of Machine Tools and Manufacture , pp. 1009-1014, 2005.

A. Jawaid, C.H. Che Haron and A. Abdullah, “„Tool wear characteristics in turning of titanium alloy Ti-6246,” Journal Material Processing and Technology, pp. 329-334, 1999.

A. Jawaid, S. Sharif and S. Koksal, “Evaluation of wear mechanism of coated carbide tools when face milling titanium alloy,” Journal of Material Processing and Technology, pp. 266-274, 2001.

C.H. Che Haron, “Tool life and surface integrity in turning titanium alloy,” Journal of Material Processing and Technology, pp. 3449-368, 2001.

M.V. Ribeiro, M.R.V. Moreira and J.R. Ferreira, “Optimization of titanium alloy (6Al-4V) machining,” Journal of Material Processing and Technology, pp. 458-463, 2003.

C. Leyens and M. Peters „Titanium and Titanium Alloys: Fundamentals and Applications’ Weinheim: Willey VCH, 2003.

I.J. Polmear, „Light Alloys: Metallurgy of the Light Metal‟ London: Edward Arnold Publisher, 1981.

E.O. Ezugwu, J. Booney, B, Rosemar, Da Silva and O. Cakir, “Surface integrity of finished turned Ti-6Al-4V alloy with PCD tools using conventional and high pressure coolant supplies.” International Journal of Machine Tools and Manufacture, pp. 884-891, 2007.

D. Novovic, R.C. Dewes, D.K. Aspinwall and P.B. Voice, “The effect of machined topography and integrity on fatigue life” International Journal of Machined Tools & Manufacture, pp. 125-134, 2004.

R.C. Gifkins “Comments on theories of structural superplasticity,” Materials Science and Engineering, pp. 27-33, 1978.

S.W. Kim, D.W. Lee, M.C. Kang and J.S. Kim, ”Evaluation of machinability by cutting environments in high-speed milling of difficult-to-cut materials,” Journal of Material Processing and Technology, pp. 256-260, 2001.

C.H. Che Haron and A. Jawaid, “The effect of machining on surface integrity of titanium alloy Ti-6%Al-4%V,” Journal of Materials Processing Technology, pp. 188-192, 2005.

T.B. Massalski, “Binary Alloys Phase Diagram,” American Society Metallurgy, pp.173, 1986.

R.R. Boyer, “Titanium for aerospace: rationale and application” Material Science and Engineering, pp. 349-368, 1995.


Refbacks

  • There are currently no refbacks.


International Conference on Engineering and Technology Development (ICETD)
Bandar Lampung University
ISSN: 2301-5690