Measurement of flow stress at high temperature in solid torsion tests

Authors: Roebuck, B.; Loveday, M.S.; Chastel, Y.; Fiorucci, G.; Negro, T. Dal

Source: Materials at High Temperatures, Volume 23, Number 2, May 2006 , pp. 119-144(26)

Publisher: Science Reviews 2000 Ltd

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Abstract:

This document outlines good measurement practice to be adopted for the determination of flow stress at high temperature in torsion tests on solid metallic materials. The recommendations are applicable to hot (isothermal) tests at medium to high rates of strain (10⁻³-10² s⁻¹) at temperatures relevant to metal working practice.

Guidance is provided on appropriate testpiece geometries and methods of verifying the temperature distribution along the length of the testpiece. Flow diagrams are given showing all the steps that are necessary, including the correction factors that need to be applied for deformational heating and for the determination of true stress. Details are given of the calibration procedures that should be followed to provide traceability to the National Measurement System.

Technical input to the document has been provided by the steering group of a European SMT funded project on High Temperature Testing, TESTIFY, that contained representatives of industrial users and producers of a wide range of engineering materials as well as academic modellers.

An experimental programme was conducted during the preparation of this document to underpin the procedures in this guide.

Keywords: flow stress; high temperature; solid torsion tests

Document Type: Research article

DOI: http://dx.doi.org/10.3184/096034006782739376

Affiliations: 1: Materials Centre, National Physical Laboratory, Teddington, UK

Publication date: 2006-05-15

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Materials at High Temperatures serves the needs of those who develop and use materials for high temperature applications. It publishes peer reviewed contributions relating to high temperature applications in the power, chemical, engine, processing and furnace industries.
The effects of high temperatures on corrosion, fatigue, creep, strength and wear in alloys, intermetallics, ceramics, refractories and composites are covered. Papers dealing with aspects of materials usage including modelling of behaviour and life prediction will be particularly welcome. The journal has a policy of emphasizing practical aspects and authors presenting results from research programmes are encouraged to relate these, if possible, to actual or potential applications.
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Measurement of flow stress at high temperature in solid torsion tests

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