Results 151 to 160 of about 2,146 (191)
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Hot workability of aluminum particulate composites
2013Questo lavoro analizza sia le curve di flusso derivanti da prove di trazione a caldo [1-5] che la microstruttura [1,2,6-9] e le simulazioni del processo di estrusione (FEM) [10-13] di compositi in lega di alluminio. I risultati in analisi derivano principalmente da studi del Prof. H. McQueen.
LEO, PAOLA +1 more
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Hot Workability Testing Techniques
1971Processes for the hot forming of metals are of great industrial importance because of the low flow stresses and high ductilities exhibited by most metals at homologous temperatures greater than one half. High rates of working which are desirable for reasons of economy have, however, the effect of increasing the flow stress and, in some circumstances ...
H. J. McQueen, J. J. Jonas
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Hot workability of alpha brasses
1963Both lead and bismuth have a deleterious effect on the hot working properties of alpha brasses. The work reported in this article shows that the element uranium, when present in the alloy in such proportions as to form stable high melting point intermetallic compounds with all of the bismuth or lead, is a highly effective agent in removing the ...
R Thomson, J O Edwards
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Hot Workability of Mechanically Alloyed In-738
1977The hot-workability of an oxide-dispersion-strengthened nickel base alloy IN-738 + Y2O3 was determined by high-strain-rate testing in the deformation range 10–4 to 102s-1 and at temperatures from 1050° to 1250°C. As-extruded IN-738 + Y2O3 shows high rupture ductilities at strain rates from 4∙10–2 to 4 s-1 and at temperatures from 1050°C to 1250°C.
Gernot H. Gessinger +2 more
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Evaluation of the Hot Workability of Commercially Pure Ti Using Hot Torsion Tests
Journal of Nanoscience and Nanotechnology, 2019Optimum processing conditions were obtained by evaluating the hot working behavior of commercially pure Ti using hot torsion tests. Hot torsion tests were conducted at temperatures ranging from 800 °C-1000 °C and strain rates ranging from 0.1-10 s-1. The flow curves show that the peak stress increases as the temperature decreases and the strain rate ...
Myoung-Hun, Kim +9 more
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Hot workability of 00Cr13Ni5Mo2 supermartensitic stainless steel
Materials & Design, 2011Abstract The hot workability of 00Cr13Ni5Mo2 supermartensitic stainless steel was investigated by hot compression and hot tension tests conducted over the temperature range of 950–1200 °C and strain rates varying between 0.1 and 50 s −1 . The processing map technique was applied on the basis of dynamic materials model and Prasad instability criterion.
Dening Zou +5 more
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Hot workability of three grades of tool steel
Metallurgical Transactions A, 1984Three tool steels, a cold-work air-hardening grade, a hot-work die grade, and a high-speed type, were deformed by torsion in the range of 900 to 1100 °C at rates of 0.1 to 5 s•1. In a series of continuous deformation tests the flow stress and ductility were determined.
C. Imbert, N. D. Ryan, H. J. McQueen
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Hot Workability of High Strength 6060 Alloy
Materials Science Forum, 2000The alloy with 0.4% Mg and 0.5% Si was torsion tested in the range 0.1 to 10 s-1 and 300 to 500°C with exhibition of excellent ductility. The hot strength was shown to be low compared to other 6000 series alloys and to have little tendency to dynamic precipitation. The hyperbolic sine constitutive equation was optimized with a stress multiplier of 0.03
H.J. McQueen, Man Jong Lee
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A model for the evaluation of hot workability of metallic materials
Journal of Materials Processing Technology, 1990Abstract Hot workability is presented from the systems point of view. Based on a polar reciprocity relationship between the stress and strain rate spaces, a measure of hot workability called hardening power index is defined. Deformation processing maps of this parameter are plotted for a titanium alloy IMI685 (Ti-6Al-5Zr-0.2Mo-0.1Si) using flow data ...
T. Rajagopalachary, V.V. Kutumbarao
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Hot workability and extrusion modelling of magnesium alloys
Zeitschrift für Metallkunde, 2005Abstract The hot working of commercial Mg alloys differs from creep in so far that twinning is much more prevalent in the early stages and dynamic recrystallization (DRX) becomes extensive above 400 °C. Subgrains form mainly near the grain boundaries and have similar dependence on stress; they were larger in hot working tests because of the much higher
H. J. McQueen, M. Sauerborn
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