Deformation dilatometer platens

Thermal measuring and testing – Thermal testing of a nonthermal quantity – Expansion or contraction characteristics

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374 51, G01N 2516

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active

046873430

ABSTRACT:
Deformation dilatometers are described for heating, deforming and cooling a test specimen, as well as for measuring changes in the linear dimensions of that specimen. A ferrous metal specimen, that is held between a fixed and a movable fused silica or quartz platen, first is heated by a high frequency induction coil and then crushed by the application of a hydraulic force to the movable platen. The hydraulic force then is withdrawn and, as the specimen is cooled by a jet of quenching gas, changes in its linear dimension are measured by a linear variable differential transformer which is coupled through ceramic pushrods to the platens. Use of fused silica or quartz platens in deformation dilatometers permits the accurate simulation of steel mill forging and rolling operations and enhances the usefulness of the instruments for studying phase changes in steel and determining optimum heating and quenching rates.

REFERENCES:
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patent: 3545263 (1970-12-01), Hadley et al.
patent: 3805589 (1974-04-01), Clusener et al.
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Pollack H. W., "Materials Science and Metallurgy", Second Edition, Reston Publishing Co. Inc., Reston, Va., 1977, pp. 326-331.
Keyser, Carl A., "Materials Science in Engineering", Second Edition, Charles E. Merrill Publishing Co., Columbus, Ohio, 1974, pp. 270-273.
Recoding Quartz Differential Dilatometer by Lloyd Argonne, National Laboratory, Jul. 1959.
An Apparatus for Determining the Coefficient of Thermal Expansion of Rocks, Mortar and Concretes, by Loubser et al., Magazine of Concrete Research, vol. 24, No. 79, Jun. 1972.

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