The deformation in chips produced in machining a nickel-iron base superalloy (Inconel 718), at various speeds up to 213.5 m/min [700 surface feet per minute (SFPM)] has been investigated. In addition to slip, considerable twinning in the chips is observed at all speeds. Up to a cutting speed of about 30.5 m/min (100 SFPM), the chips formed are essentially continuous and ribbon-like, although deformation in the chip is inhomogeneous. At cutting speeds above 61 m/min (200 SFPM), shear-localized chips form. The longitudinal midsections of the chips show gross inhomogeneous deformation with shear localization between any two segments, and relatively low deformation within any individual segment. With an increase in speed the extent of contact between segments decreases rapidly, until a speed is reached where the individual segments become completely detached. The speed at which this occurs for other difficult-to-machine materials, such as AISI 4340, was found in an earlier study, to depend upon the metallurgical condition of the material and its hardness. Based on this study, the mechanism of chip formation when machining Inconel 718 is very similar to that reported earlier for machining both titanium alloys and hardened AISI 4340 steels at higher speeds. While the hcp crystal structure of titanium alloys in addition to titanium’s poor thermal properties (kρc) is believed to be partly responsible for the intense shear localization in that material, results with Inconel 718 (fcc) and AISI 4340 steel (bcc) indicate that the effect of structure on shear localization is not yet well understood.
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May 1986
This article was originally published in
Journal of Engineering for Industry
Research Papers
On Shear Instability in Machining a Nickel-Iron Base Superalloy
R. Komanduri,
R. Komanduri
Materials Engineering and Processing, National Science Foundation, Washington, DC
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T. A. Schroeder
T. A. Schroeder
General Electric Carboloy Systems Business Development, Schenectady, NY
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R. Komanduri
Materials Engineering and Processing, National Science Foundation, Washington, DC
T. A. Schroeder
General Electric Carboloy Systems Business Development, Schenectady, NY
J. Eng. Ind. May 1986, 108(2): 93-100
Published Online: May 1, 1986
Article history
Received:
May 16, 1985
Online:
July 30, 2009
Citation
Komanduri, R., and Schroeder, T. A. (May 1, 1986). "On Shear Instability in Machining a Nickel-Iron Base Superalloy." ASME. J. Eng. Ind. May 1986; 108(2): 93–100. https://doi.org/10.1115/1.3187056
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