Color Band Formation on Heated Steel Bars and Subsequent Formation of Pearlite Versus Spheroidite on Slow Cooling

When a smith heats a metal bar, an austenite front, A f , advances into the bar. Experiments show the following: [1] A significant shift occurs in the location of the A f front on the observed color bands formed on a heat-up versus a cool-down experiment. [2] The resulting microstructure produced fr...

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Bibliographic Details
Published in:Metallography, microstructure, and analysis microstructure, and analysis, 2023-12, Vol.12 (6), p.953-964
Main Authors: Zowada, Tim, Cashen, Kevin, Verhoeven, J. D.
Format: Article
Language:English
Subjects:
Austenite
Bainite
Characterization and Evaluation of Materials
Chemistry and Materials Science
Color
Cooling
Cooling rate
Martensite
Materials Science
Metallic Materials
Nanotechnology
Original Research Article
Pearlite
Quenching
Steel
Structural Materials
Surfaces and Interfaces
Thin Films
Transformations
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Summary:When a smith heats a metal bar, an austenite front, A f , advances into the bar. Experiments show the following: [1] A significant shift occurs in the location of the A f front on the observed color bands formed on a heat-up versus a cool-down experiment. [2] The resulting microstructure produced from the austenite zone extending from the hot end to the A f front for three different cooling rates: (a) quenching in water; (b) cooling at an intermittent rate too fast to allow the transformation to occur by the divorced eutectoid transformation (DET) mode and too slow to produce bainite or martensite; and (c) cooling slow enough for the eutectoid transformation to occur by the DET mode rather than the PET mode, pearlite eutectoid transformation. Experiments were done confirming a previous study showing that when starting with pearlite the product of the DET is a mixture of ferrite, coarse pearlite, and spheroidite, whereas starting with a spheroidite it is spheroidite.
ISSN:2192-9262
2192-9270
DOI:10.1007/s13632-023-01021-6