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Journal of Materials Engineering and Performance
Erschienen in: Journal of Materials Engineering and Performance 9/2018

24.08.2018

Mechanism of Decrease in Impact Toughness in a Low-Carbon MnCrMoNiCu Plate Steel with Increasing Austenitizing Temperature

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 9/2018

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Abstract

In order to reveal how microscopic factors affect the toughness and the occurrence of cleavage fracture of a low-carbon MnCrMoNiCu alloyed steel, a series of thermal treatments was performed on the steel employing a thermomechanical simulator. These involved reheating samples at different temperatures (950-1250 °C), producing different prior austenite sizes, followed by a continuous cooling transformation process. The Charpy V-notch toughness was determined, and the effect of austenite grain size on the ductile-to-brittle transition temperatures of the steel was investigated. The microstructural evolution on the austenite sizes was studied, fracture features were characterized, the critical event for cleavage fracture was identified, and the local cleavage fracture stress σf was calculated. The impact toughness decreased as the austenitizing temperature increased. A quantitative relationship between σf and the size of the initial cleavage fracture facet (microcrack nucleus) af in the lathy martensite + bainite microstructure has been developed.
Vorheriger Artikel Sagging Mechanisms of Three-Layer Aluminum Clad Foils used in the Heat Exchanger in the Brazing Process
Nächster Artikel Effect of Rolling Temperature on Fracture Properties of INRAFMS at Different Temperatures

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Metadaten
Titel
Mechanism of Decrease in Impact Toughness in a Low-Carbon MnCrMoNiCu Plate Steel with Increasing Austenitizing Temperature
Publikationsdatum
24.08.2018
Erschienen in
Journal of Materials Engineering and Performance / Ausgabe 9/2018
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-018-3591-4

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