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Deformation and Fracture Testing for Hot Working Processes

  • Physical & Mechanical Metallurgy
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Abstract

A hot workability testing apparatus has been designed and constructed for determining flow stress and fracture of materials at elevated temperatures. The system is composed of four major elements: a closed-loop servo-controlled hydraulic testing machine with programmable and custom-made control components; a high temperature tooling and radiant heating furnace for isothermal test conditions; a test specimen transfer device for ease of testing and rapid quenching; and a computerized data acquisition and reduction system. Isothermal, homogeneous compression tests are performed for flow stress determination, while upset and bend tests are used for workability evaluation. Test temperatures to 1200°C may be achieved, along with constant strain rates up to 20s’1 for both compression and bend tests. Specimens can be quenched within 0.5-0.75s to permit the study of the microstructures developed during hot deformation. In both compression and bending, interrupted deformation schedules can be programmed. Change of rate tests to measure strain rate sensitivites are also possible. Capabilities of the system are illustrated by results obtained for the multiphase alloy MP35N (35% Co, 35% Ni, 20%o Cr, and 10% Mo).

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Authors and Affiliations

  1. University of Pittsburgh, Pittsburgh, Pennsylvania, USA

    G. Fitzsimons, H. A. Kuhn & R. Venkateshwar

Authors
  1. G. Fitzsimons
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  2. H. A. Kuhn
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  3. R. Venkateshwar
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Additional information

Guillermo Fitzsimons is a research associate with the Department of metallurgical and Materials Engineering at the University of Pittsburgh. He received a BS in physics from the University of Buenos Aires and a PhD in metallurgical engineering from the University of Pittsburgh. He als completed the Curso de Metallurgia de Pan Americano in Mexico City.

Howard A. Kuhn is professor of metallurgical and materials engineering at the University of Pittsburgh. He received his BS, MS, and PhD from Carnegie-Mellon University. He has written over 50 technical articles and holds 2 patents in metalworking, powder metallurgy, computer-aided design, and mechanical testing.

Ramachandran Venkateshwar is associated with the Rock Island Arsenal, Rock Island Illinois. He received his BS in metallurgical engineering from the Indian Institute of Technology in Madras, India and his MS in metallurgical engineering from the University of Pittsburgh. His experience includes a position as research scientist at Battelle Columbus Laboratories.

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Fitzsimons, G., Kuhn, H.A. & Venkateshwar, R. Deformation and Fracture Testing for Hot Working Processes. JOM 33, 11–17 (1981). https://doi.org/10.1007/BF03354416

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