The Effects of Cutting Conditions on Surface Integrity in Machining Waspaloy

Abstract:

Machining of advanced aerospace materials have grown in the recent years although the difficult-to-machine characteristics of alloys like titanium or nickel based alloys cause higher cutting forces, rapid tool wear, and more heat generation. Therefore, machining with the use of cooling lubricants is usually carried out. To reduce the production costs and to make the processes environmentally safe, the goal is to move toward dry cutting by eliminating cutting fluids. This objective can be achieved by using coated tool, by increasing cutting speed and by improving the product performance in term of surface integrity and product quality. The paper addresses the effects of cutting speed and feed on the surface integrity during dry machining of Waspaloy using coated tools. In particular, the influence of the cutting conditions on mechanical power consumption, the tool wear and some important indicator of the surface integrity (surface roughness, affected layer, microhardness, grain size and microstructural alteration) were investigated. Results show that cutting conditions have a significant effect on the parameters related to the surface integrity of the product affecting its overall performance.

• Periodical: Key Engineering Materials (Volumes 611-612)
• Pages: 1243-1249
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.611-612.1243
• Online since: May 2014
• Authors: Domenico Umbrello
• Keywords: Machining, Surface Integrity, Waspaloy

References

[1] I.A. Choudhury, M.A. El-Baradie, Machinability of nickel-base super alloys: a general review, J. Mater. Proc. Technol. 77 (1998) 278-284.

DOI: 10.1016/s0924-0136(97)00429-9

[2] E.O. Ezugwu, Key improvements in the machining of difficult-to-cut aerospace superalloys, Int. J. Machine Tools & Manuf. 45/12-13 (2005) 1353-1367.

DOI: 10.1016/j.ijmachtools.2005.02.003

[3] Z. Li, S.L. Gobbi, F. Bonollo, A. Tiziani, G. Fontana, Metallurgical investigation of laser welds in wrought WASPALOY. Sci. Technol. Weld. Joining. 3/1 (1998) 1-7.

DOI: 10.1179/stw.1998.3.1.1

[4] WASPALOY, Special Metals Corporation, Publication Number SMC-011(2004) 1-3.

[5] P. Strunz, J. Zrník, T. Seliga, H.J. Penkalla, SANS investigation of precipitate microstructure in nickel-base superalloys WASPALOY and DT750. Z. Kristallogr. Suppl. 23 (2006) 363-368.

DOI: 10.1524/zksu.2006.suppl_23.363

[6] V. Siva Kumar, G. Kelekanjeri, R.A. Gerhardt, Characterization of microstructural fluctuations in WASPALOY exposed to 760 °C for times up to 2500 h. Electrochim. Acta. 51(2006) 1873-1880.

DOI: 10.1016/j.electacta.2005.02.099

[7] D. Ulutan, T. Ozel, Machining induced surface integrity in titanium and nickel alloys: A review, Int. J. Machine Tools & Manuf. 51/3 (2011) 250-280.

DOI: 10.1016/j.ijmachtools.2010.11.003

[8] R.C. McClung, A literature survey on the stability and significance of residual stresses during fatigue, Fatigue Frac. Eng. Mater. & Struct. 30 (2007)173-205.

DOI: 10.1111/j.1460-2695.2007.01102.x

[9] JCPDS – International Centre for Diffraction Data, Powder Diffraction File, Inorganic Phases, Sets 1-60, (2010).

[10] JCPDS – International Centre for Diffraction Data, Powder Diffraction File Hanawalt - Search Manual - Inorganic Phase, (1993).