Chip Formation and Machinability of Nickel-Base Superalloys


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Nickel-base superalloys like Alloy 625 are widely used in power generation applications and in the oil and gas industry due to their unique properties especially at elevated temperatures. The chip formation process of Alloy 625 is not yet well understood. Therefore, the cutting process of this alloy has been studied in detail by means of orthogonal cutting experiments at conventional cutting speeds and in the high-speed cutting regime. Alloy 625 shows a cutting parameter dependent change in the chip formation process from continuous to segmented chips. Silver has been added to Alloy 625 to improve the machinability. During machining of these modified alloys short breaking chips develop so that cutting processes are eased and can be automated.



Main Theme:

Edited by:

M. Heilmaier




C. Siemers et al., "Chip Formation and Machinability of Nickel-Base Superalloys", Advanced Materials Research, Vol. 278, pp. 460-465, 2011

Online since:

July 2011


[1] C.T. Sims, N.S. Stoloff and W.C. Hagel: Superalloys II (Wiley & Sons, Canada 1987).

[2] R.C. Reed: The Superalloys: Fundamentals and Applications (Cambridge University Press, UK 2008).

[3] M.J. Donarchie and S.J. Donarchie: Superalloys: A Technical Guide (ASM International, USA 2002).

[4] R. Komanduri and T.A. Schroeder: On Shear Instability in Machining a Nickel-Iron Base Superalloy High Speed Machining; New Orleans, Louisiana; USA; 9-14 Dec. 1984, 287-307.

[5] I.A. Choudhury and M.A. El-Baradie, J. Mater. Process. Technol. 77(1-3) (1998), 278-284.

[6] Information on http: /www. hightempmetals. com.

[7] E.O. Ezugwu, Int. J. Mach. Tool. Manufact. 45(12-13) (2005), 1353-1367.

[8] M. Durrand-Charre: Microstructure of Superalloys (Gordon and Breach Science Publishers, Netherlands 2003).

[9] R. Bouchard, D. Hupfeld, T. Lippmann, J. Neuefeind, H.B. Neumann, H.F. Poulsen, U. Rütt, T. Schmidt, J.R. Schneider, J. Süssenbach, and M. von Zimmermann, J. Synchrotron Radiat. 5(2) (1998), 90–101.