Journal ArticleDOI
Identification of flow instabilities during hot working of powder metallurgy superalloy IN 100
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In this article, a simple instability condition based on the Ziegler's continuum principles is extended for delineating the regions of unstable metal flow during hot deformation of powder metallurgy materials.Abstract:
A simple instability condition based on the Ziegler's continuum principles as applied to large plastic flow, is extended for delineating the regions of unstable metal flow during hot deformation of powder metallurgy materials. This criterion has been applied to the existing flow stress data of powder metallurgy superalloy IN 100 and compared with the reported microstructural observations. The optimum hot working conditions for the PM superalloy IN 100 are suggested.read more
Citations
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Journal ArticleDOI
Hot workability and microstructure control in Co20Cr15W10Ni cobalt-based superalloy
TL;DR: In this article, hot isothermal compression tests were conducted on Cobalt-based superalloy Co 20Cr 15W 10Ni using a thermo-mechanical simulator to study the hot workability and microstructure evolution over a wide range of temperatures and strain rates.
Journal ArticleDOI
Development and validation of processing maps for nickel based powder metallurgy superalloys
TL;DR: In this article, a simple instability condition based on Ziegler's continuum principles is extended to define the deformation processing maps that delineate'safe' and 'non-safe' hot working conditions.
References
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Journal ArticleDOI
Modeling of dynamic material behavior in hot deformation: Forging of Ti-6242
Y. V. R. K. Prasad,Y. V. R. K. Prasad,H. L. Gegel,S. M. Doraivelu,J. C. Malas,J. T. Morgan,K. A. Lark,D. R. Barker +7 more
TL;DR: In this article, a new method of modeling material behavior which accounts for the dynamic metallurgical processes occurring during hot deformation is presented, which considers the workpiece as a dissipator of power in the total processing system and evaluates the dissipated power co-contentJ = ∫o σ e ⋅dσ from the constitutive equation relating the strain rate (e) to the flow stress (σ).
Book
Powder metallurgy of superalloys
G. H. Gessinger,M. J. Bomford +1 more
TL;DR: Nickel-chromium and, to a lesser extent, cobaltchromium alloys are the major class of materials used for the high temperature components of aircraft, marine, and land-based power systems as mentioned in this paper.
Journal ArticleDOI
Mechanical processing and microstructural control in hot working of hot isostatically pressed P/M IN-100 superalloy
TL;DR: In this paper, the hot deformation behavior of hot isostatically pressed (HIPd) P/M IN-100 superalloy has been studied in the temperature range 1000-1200 degrees C and strain rate range 0.0003-10 s(-1) using hot compression testing.
Journal ArticleDOI
Processing map for controlling microstructure in hot working of hot isostatically pressed powder metallurgy NIMONIC AP-1 superalloy
Mahesh C. Somani,E. S. Bhagiradha Rao,N. C. Birla,M. L. Bhatia,Vakil Singh,Y. V. R. K. Prasad +5 more
TL;DR: In this article, the hot deformation behavior of hot isostatically pressed (HIP) NIMONIC AP-1 superalloy is characterized using processing maps in the temperature range 950 °C to 1200 °C and strain rate range 0.001 to 100 s•1.
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