NDLI: The Tensile Properties of Pearlite, Bainite, and Spheroidite

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Introduction to “The Tensile Properties of Pearlite, Bainite, and Spheroidite,” Transactions of the American Society for Metals, Vol. 30, Dec 1942, pp. 983–1020 by M. Gensamer, E. B. Pearsall, W. S. Pellini, and J. R. Low Jr.

The Tensile Properties of Pearlite, Bainite, and Spheroidite

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The Tensile Properties of Pearlite, Bainite, and Spheroidite

Content Provider	Springer Nature Link
Author	Gensamer, M. Pearsall, E. B. Pellini, W. S. Low, J. R.
Copyright Year	1942
Abstract	The tensile properties of four steels have been determined as a quantitative function of the measured dimensions of the aggregate structures pearlite and spheroidite, and of the austenite decomposition temperature for the structures pearlite and bainite. Studies of the recalescence effect have been performed in connection with the measurement of the reaction temperature. The strength indices (stress at corresponding strains, tensile strength, hardness) vary linearly with the reaction temperature and the logarithm of the dimensions of the aggregate. Mixtures of pearlite and bainite are intermediate in strength. The ductility indices are low for mixed structures, coarse pearlite and low temperature bainite; higher for bainite and pearlite in the middle of the reaction temperature range for each. It has been observed that spheroidized eutectoid specimens have a typical mild steel yield point; pearlitic specimens of the same tensile strength do not. The spacing of pearlite is shown to be proportional to the carbon diffusion coefficient in austenite, the logarithm of the spacing plotting as a straight line against the reciprocal of the absolute reaction temperature, with the same slope as a similar plot for the diffusion coefficient. Because of this it is concluded that a measurement of the spacing at one temperature permits its calculation at another, using the measured energy of activation for the diffusion of carbon in the steel. A rule of strength for aggregates is proposed, based on these studies, as follows: The resistance to deformation of a metallic aggregate consisting of a hard phase dispersed in a softer one is proportional to the logarithm of the mean straight path through the continuous phase. The rule works for a comparison of the properties of pearlite and spheroidite, as well as for pearlite alone over a wide range of spacings, and extrapolates to reasonable particle sizes for the finest spheroidites (tempered martensite). A simple explanation of the semilogarithmic character of the relationship is advanced.
Starting Page	171
Ending Page	189
Page Count	19
File Format	PDF
ISSN	21929262
Journal	Metallography, Microstructure, and Analysis
Volume Number	1
Issue Number	3-4
e-ISSN	21929270
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-10-13
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Microstructure Tensile properties Mechanical properties Pearlite Bainite Structural Materials Characterization and Evaluation of Materials Surfaces and Interfaces, Thin Films Metallic Materials Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Metals and Alloys

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Introduction to “The Tensile Properties of Pearlite, Bainite, and Spheroidite,” Transactions of the American Society for Metals, Vol. 30, Dec 1942, pp. 983–1020 by M. Gensamer, E. B. Pearsall, W. S. Pellini, and J. R. Low Jr.

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The Tensile Properties of Pearlite, Bainite, and Spheroidite

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Introduction to “The Tensile Properties of Pearlite, Bainite, and Spheroidite,” Transactions of the American Society for Metals, Vol. 30, Dec 1942, pp. 983–1020 by M. Gensamer, E. B. Pearsall, W. S. Pellini, and J. R. Low Jr.

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