Influence of Milling on Surface Integrity of Ti-6Al-4V

Abstract:

The present article addresses the influence of milling on the surface integrity of Ti-6Al-4V. Observation of the machined surface from a macroscopic perspective (naked eye) has highlighted an orange peel phenomenon. Under the machined surface no plastically deformed layer or lengthening of the grains were observed. As far as microhardness is concerned, a slightly softened zone was noted under the machined surface. Diffusion of vanadium from phase β to phase α also occurred but without resulting change to the microstructure. Measurement of microhardness and residual stresses showed that the finishing pass predominated over the roughing pass in terms of its influence on surface integrity. The response surface methodology was used in order to highlight those parameters influencing surface integrity. Its application and processing showed that the most influential factor is the nose radius for roughness and the cutting speed for residual stresses.

• Periodical: Advanced Materials Research (Volume 698)
• Pages: 127-136
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.698.127
• Online since: May 2013
• Authors: Kamel Moussaoui, Michel Mousseigne, Johanna Senatore, Pierre Lagarrigue, Yves Caumel
• Keywords: Milling, Surface Integrity, Ti6Al4V

References

[1] Ezugwu E. O., 2005, "Key improvements in the machining of difficult-to-cut aerospace superalloys," International Journal of Machine Tools and Manufacture, 45(12-13), p.1353–1367.

DOI: 10.1016/j.ijmachtools.2005.02.003

[2] KONIG W., 1978, "Applied Research on the Machinability of Titanium and its Alloys," Proceedings of 47th Meeting of AGARD Structural and Materials Panel, Florence, Italy, p.1.1–1.10.

[3] Sun J., and Guo Y. B., 2008, "A new multi-view approach to characterize 3D chip morphology and properties in end milling titanium Ti-6Al-4V," International Journal of Machine Tools and Manufacture, 48(12-13), p.1486–1494.

DOI: 10.1016/j.ijmachtools.2008.04.002

[4] Ezugwu E. O., and Wang Z. M., 1997, "Titanium alloys and their machinability–a review," Journal of Materials Processing Technology, 68(3), p.262–274.

DOI: 10.1016/s0924-0136(96)00030-1

[5] Ulutan D., and Ozel T., 2011, "Machining induced surface integrity in titanium and nickel alloys: A review," International Journal of Machine Tools and Manufacture, 51(3), p.250–280.

DOI: 10.1016/j.ijmachtools.2010.11.003

[6] Geng G. S., and Xu J. H., 2008, "Surface Integrity and Fatigue Property of a High Speed Milled Titanium Alloy," Advanced Materials Research, 53-54, p.305–310.

DOI: 10.4028/www.scientific.net/amr.53-54.305

[7] Ribeiro M. V., Moreira M. R. V., and Ferreira J. R., 2003, "Optimization of titanium alloy (6Al-4V) machining," Journal of Materials Processing Technology, 143-144, p.458–463.

DOI: 10.1016/s0924-0136(03)00457-6

[8] Che-Haron C. H., and Jawaid A., 2005, "The effect of machining on surface integrity of titanium alloy Ti-6% Al-4% V," Journal of Materials Processing Technology, 166(2), p.188–192.

DOI: 10.1016/j.jmatprotec.2004.08.012

[9] Ibrahim G. ., Haron C. . C., and Ghani J. ., 2009, "The effect of dry machining on surface integrity of titanium alloy Ti-6Al-4V ELI," Journal of Applied Sciences, 9, p.121–127.

DOI: 10.3923/jas.2009.121.127

[10] Elmagrabi N., Hassan C. . C., Jaharah A. ., and Shuaeib F. ., 2008, "High speed milling of Ti-6Al-4V using coated carbide tools," European Journal of Scientific Research, 22(2), p.153–162.

[11] Sun J., and Guo Y. B., 2009, "A comprehensive experimental study on surface integrity by end milling Ti-6Al-4V," Journal of Materials Processing Technology, 209(8), p.4036–4042.

DOI: 10.1016/j.jmatprotec.2008.09.022

[12] Hughes J. I., Sharman A. R. C., and Ridgway K., 2006, "The Effect of Cutting Tool Material and Edge Geometry on Tool Life and Workpiece Surface Integrity," Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 220(2), p.93–107.

DOI: 10.1243/095440506x78192

[13] Narutaki N., Murakoshi A., Motonishi S., and Takeyama H., 1983, "Study on Machining of Titanium Alloys," CIRP Annals - Manufacturing Technology, 32(1), p.65–69.

DOI: 10.1016/s0007-8506(07)63362-9

[14] Velasquez J. D. P., Bolle B., Chevrier P., and Tidu A., 2006, "SURFACE INTEGRITY IN HIGH SPEED MACHINING OF Ti-6wt.%Al-4wt.%V ALLOY," Residual Stress and Its Effects on Fatigue and Fracture, p.87–95.

DOI: 10.1007/1-4020-4972-2_655

[15] Bouchnak T. B., 2010, "Etude du comportement en sollicitations extrêmes et de l'usinabilité d'un nouvel alliage de titane aéronautique : le Ti555-3," Ecole Nationale Supérieure d'Arts et Métiers.

[16] Chen L., El-Wardany T. I., and Harris W. C., 2004, "Modelling the Effects of Flank Wear Land and Chip Formation on Residual Stresses," CIRP Annals - Manufacturing Technology, 53(1), p.95–98.

DOI: 10.1016/s0007-8506(07)60653-2

[17] Che-Haron C. H., 2001, "Tool life and surface integrity in turning titanium alloy," Journal of Materials Processing Technology, 118(1-3), p.231–237.

DOI: 10.1016/s0924-0136(01)00926-8

[18] VELASQUEZ J. D. P., 2007, "Etude des copeaux et de l'intégrité de surface en usinage à grande vitesse de l'alliage de titane TA6V," University Paul Verlaine.

[19] Reissig L., Völkl R., Mills M. J., and Glatzel U., 2004, "Investigation of near surface structure in order to determine process-temperatures during different machining processes of Ti6Al4V," Scripta Materialia, 50(1), p.121–126.

DOI: 10.1016/j.scriptamat.2003.09.023

[20] Cantero J. L., Tardío M. M., Canteli J. A., Marcos M., and Miguélez M. H., 2005, "Dry drilling of alloy Ti–6Al–4V," International Journal of Machine Tools and Manufacture, 45(11), p.1246–1255.

DOI: 10.1016/j.ijmachtools.2005.01.010

[21] Li R., Riester L., Watkins T. R., Blau P. J., and Shih A. J., 2008, "Metallurgical analysis and nanoindentation characterization of Ti–6Al–4V workpiece and chips in high-throughput drilling," Materials Science and Engineering: A, 472(1–2), p.115–124.

DOI: 10.1016/j.msea.2007.03.054

[22] Zhou L., Shimizu J., Muroya A., and Eda H., 2003, "Material removal mechanism beyond plastic wave propagation rate," Precision Engineering, 27(2), p.109–116.

DOI: 10.1016/s0141-6359(02)00124-1

[23] Ezugwu E. O., Bonney J., Da Silva R. B., and Çakir O., 2007, "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, 47(6), p.884–891.

DOI: 10.1016/j.ijmachtools.2006.08.005

[24] Kitagawa T., Kubo A., and Maekawa K., 1997, "Temperature and wear of cutting tools in high-speed machining of Inconel 718 and Ti-6Al-6V-2Sn," Wear, 202(2), p.142–148.

DOI: 10.1016/s0043-1648(96)07255-9

[25] Welsch G., Boyer R., and Collings E. W., 1994, Materials properties handbook: Titanium alloys, ASM International.

[26] Banerjee R., Collins P. ., Bhattacharyya D., Banerjee S., and Fraser H. ., 2003, "Microstructural evolution in laser deposited compositionally graded alpha/beta titanium-vanadium alloys," Acta Materialia, 51(11), p.3277–3292.

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

[27] Craighead C. M., Simmons O. W., and Eastwood L. W., 1950, "Titanium Binary Alloys," TRANSACTIONS AIME, 188.