Two conventional methods, compression of right-circular cylinders and torsion of thin-walled tubes, were used for isothermal tests.A direct-resistance-heating technique utilizing torsion of round-bar specimens in a Gleeble machine was applied for both isothermal and transient-heating conditions.When expressed in terms of effective stress and strain, baseline data determined by the two conventional methods showed good agreement.
With the aid of a flow-localization analysis to assess the confounding influence of axial (and radial) temperature gradients on deformation uniformity, the flow stresses determined from nominally-isothermal Gleeble torsion tests were shown to be broadly similar to those from the conventional tests. With regard to transient phenomena, Gleeble tests were also useful in quantifying the effect of rapid heating and short soak time on the observed higher flow stress associated with a metastable microstructure. The present work also introduces two new test techniques using direct-resistance-heated torsion specimens. Asm Handbook Volume 6A Welding Fundamentals And Processes Pdf Series Of TemperaturesOne involves continuous heating under constant-torque conditions, and the other comprises testing an individual specimen at a series of temperatures and strain rates. The yeoman assistance of P.N. Fagin and J.O. Brown in conducting the experiments and N.C. Levkulich in performing the metallography is greatly appreciated. One of the authors (ONS) was supported under the auspices of contract FA8650-15-D-5230 managed by UES, Inc. Zhang View author publications You can also search for this author in. Rights and permissions Reprints and Permissions About this article Cite this article Semiatin, S.L., Mahaffey, D.W., Tung, D.J. A Comparison of the Plastic-Flow Response of a Powder-Metallurgy Nickel-Base Superalloy Under Nominally-Isothermal and Transient-Heating Hot-Working Conditions. Asm Handbook Volume 6A Welding Fundamentals And Processes Pdf Download Citation ReceivedDownload citation Received: 21 September 2016 Published: 06 January 2017 Issue Date: April 2017 DOI: Keywords Flow Stress Effective Strain Friction Welding Torsion Test Flow Softening.
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