Secondary Carbide Precipitation in Low Silicon Hot Work Tool Steels

A reduction from 1.0 to 0.3%Si has recently been shown to improve mechanical properties of H11-type hot work tool steels. The present paper shows that an important improvement in toughness can be explained by the effect of Si content on the precipitation sequence of secondary carbides during temperi...

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Veröffentlicht in:Materials science forum 2010-01, Vol.636-637, p.612-617
Hauptverfasser: Mesquita, Rafael Agnelli, Kestenbach, H.J., Barbosa, Celso Antonio, Morales, E. Valencia
Format: Artikel
Sprache:eng
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Zusammenfassung:A reduction from 1.0 to 0.3%Si has recently been shown to improve mechanical properties of H11-type hot work tool steels. The present paper shows that an important improvement in toughness can be explained by the effect of Si content on the precipitation sequence of secondary carbides during tempering after quenching. Carbide particle distributions were observed and identified by electron microscopy, allowing to relate the effect of Si on mechanical properties directly to its effect on cementite and subsequent alloy carbide formation during high temperature tempering.
ISSN:0255-5476
1662-9752
1662-9752
DOI:10.4028/www.scientific.net/MSF.636-637.612