Journal ArticleDOI
Development and validation of processing maps for nickel based powder metallurgy superalloys
TLDR
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.Abstract:
A simple instability condition based on Ziegler's continuum principles as applied to large plastic flow is extended to define the deformation processing maps that delineate 'safe' and 'non-safe' hot working conditions. Processing maps were developed utilising the measured flow stress data of nickel based powder metallurgy superalloys in a constitutive equation. The applicability of the processing maps developed has been examined by comparing with the reported microstructural observations of deformed compression specimens. Optimum hot working conditions for the materials are suggested, based on the maximum values of the strain rate sensitivity index.read more
Citations
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Effect of processing parameters on hot compressive deformation behavior of a new Ni–Cr–Co based P/M superalloy
TL;DR: In this paper, the effect of processing parameters on flow stress, activation energy, power dissipation η maps and instability maps were investigated in Ni-Cr-Co based P/M superalloy in the temperature range of 950-1150°C and strain rate range of 0.0003-1 s−1 using hot compression tests.
Journal ArticleDOI
The Effect of element additions on the microstructure and the mechanical properties of cobalt based superalloys produced via powder metallurgy technique
Özgür Özgün,Ömer Faruk Akbulut +1 more
TL;DR: In this paper, the authors present a list of the elements to be used in the construction of the Stellite 6 superalasim malzemelerin mikroyapi ve mekanik ozelliklerine Fe ve B elementlerinin etkisi incelenmistir.
References
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Journal ArticleDOI
Progress in Solid Mechanics
TL;DR: Sneddon et al. as discussed by the authors published the progress in solid mechanics Vol. 1, No. 1. Pp. xi + 331 + 331, and revised it to No. 2, p. xii + 448.
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Constitutive equations for use in prediction of flow stress during extrusion of aluminium alloys
T. Sheppard,A. Jackson +1 more
TL;DR: In this paper, a review of the use of the Zener-Hollomon type of equation in the context of extrusion is presented, and it is concluded that mainly because extrusion converts directly from cast to finished product a steady state equation is adequate for use in extrusion problems.
Journal ArticleDOI
Constitutive equations for high temperature flow stress of aluminium alloys
TL;DR: In this article, Sah et al. used constitutive equations for the relationship between stress, strain, strain rate, and temperature for modeling thermomechanical processing and provided an accurate description of the experimental stress-strain curves, including the effect of temperature rise due to deformational heating.