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TECHNICAL PAPERS: Gas Turbines: Manufacturing, Materials, and Metallurgy

Dimensional Instability Studies in Machining of Inconel 718 Nickel Based Superalloy as Applied to Aerogas Turbine Components

[+] Author and Article Information
B. K. Subhas, R. Bhat, K. Ramachandra

Gas Turbine Research Establishment, Ministry of Defense C. V. Raman Nagar, Bangalore, India

H. K. Balakrishna

University Visvesvaraya, College of Engineering, Bangalore, 560001, India

J. Eng. Gas Turbines Power 122(1), 55-61 (Oct 20, 1999) (7 pages) doi:10.1115/1.483175 History: Received March 24, 1998; Revised October 20, 1999
Copyright © 2000 by ASME
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References

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Tsuchida,  K., Kawada,  Y., and Kodama,  S., 1975, Bull. JSME, 18, No. 116, pp. 123–130.

Figures

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Dimensional instability in IV stage compressor disc
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Dimensional instability of Inconel 718, titanium alloy, and mild steel
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Experimental set up for hole drilling method of residual stress measurement
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Test specimen with strain gauge rosette mounted on it
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Optical micrograph of longitudinal mid section of the chip (Magnification: 500×)
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Optical micrograph of machined specimen (Magnification: 500×)
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Effect of rake angle on residual stress distribution (v=13 m/min,f=0.04 mm/rev,d=0.5 mm)
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Residual stresses in cutting direction versus shear plane length
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Cutting Force and Frictional force versus Contact length
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Residual stress distribution (v=32 m/min,f=0.13 mm/rev,d=1.0 mm, α=−6 deg)
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Residual stress distribution (v=13 m/min,f=0.13 mm/rev,d=1.0 mm, α=+6 deg)
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Effect of feed on residual stress distribution (v=13 m/min,d=0.5 mm, α=6 deg)
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Effect of depth of cut on residual stress distribution (v=14 m/min,f=0.04 mm/rev, α=6 deg)
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Effect of non-optimized parameters on dimensional instability
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Effect of optimized parameters on dimensional instability

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