Structural and phase states in high-quality rail.

Autor: Peregudov, O., Gromov, V., Ivanov, Yu., Morozov, K., Konovalov, S.
Zdroj: Steel in Translation; Apr2016, Vol. 46 Issue 4, p260-263, 4p
Abstrakt: The structural and phase states and dislocational substructure in high-quality bulk-quenched rail are assessed quantitatively by transmission electron diffraction microscopy. On the basis of the morphological features, the following structural components of the rail steel are identified: plate pearlite (68%); mixed ferrite-carbide grains (28%); and structure-free ferrite grains (4%). Analysis of the flexural extinction contours shows that the stress concentrators in the steel are the boundaries between cementite plates within the pearlite grains; the boundaries between the pearlite grains and the ferrite grains; and the boundaries between globular particles of secondary phase and the ferrite matrix. The particle-matrix boundaries are the most significant stress concentrators and may be regarded as the primary sites of crack formation. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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