Inconel 718 (IN718) presents significant challenges in machining due to its high strength properties at high temperature, attributable to the hard niobium and titanium carbide phases. Machined surfaces (oblique turning) at conventional conditions of speeds and feeds, typically show a tendency of those carbides to crack, drag and smear under the machining stresses and deformation. Such behavior can severely debilitate the fatigue strength of the material, and cause accelerated damage. This paper describes the experimental investigations as well as the qualitative and quantitative studies undertaken to study and mitigate the impact of process variables and tool geometry parameters on the carbide surface cracking phenomenon. SEM observations showed the feed rate (or chip thickness), nose radius, and insert grade-edge geometry to have significant influences on the behavior of these surface carbides.
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ASME 2009 International Manufacturing Science and Engineering Conference
October 4–7, 2009
West Lafayette, Indiana, USA
Conference Sponsors:
- Manufacturing Engineering Division
ISBN:
978-0-7918-4362-8
PROCEEDINGS PAPER
Experimental Investigations Into the Carbide Cracking Phenomenon on Inconel 718 Superalloy Material
Santosh Ranganath,
Santosh Ranganath
Pratt and Whitney, East Hartford, CT
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Changsheng Guo,
Changsheng Guo
United Technologies Research Center, East Hartford, CT
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Sean Holt
Sean Holt
Sandvik Inc., Fair Lawn, NJ
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Santosh Ranganath
Pratt and Whitney, East Hartford, CT
Changsheng Guo
United Technologies Research Center, East Hartford, CT
Sean Holt
Sandvik Inc., Fair Lawn, NJ
Paper No:
MSEC2009-84085, pp. 33-39; 7 pages
Published Online:
September 20, 2010
Citation
Ranganath, S, Guo, C, & Holt, S. "Experimental Investigations Into the Carbide Cracking Phenomenon on Inconel 718 Superalloy Material." Proceedings of the ASME 2009 International Manufacturing Science and Engineering Conference. ASME 2009 International Manufacturing Science and Engineering Conference, Volume 2. West Lafayette, Indiana, USA. October 4–7, 2009. pp. 33-39. ASME. https://doi.org/10.1115/MSEC2009-84085
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