Secondary carbide precipitation in an 18 wt%Cr-1 wt% Mo white iron View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1996-01

AUTHORS

G. L. F. Powell, J. V. Bee

ABSTRACT

High chromium (18%) white irons solidify with a substantially austenitic matrix supersaturated with chromium and carbon. The austenite is destabilized by a hightemperature heat treatment which precipitates chromium-rich secondary carbides. In the as-cast condition the eutectic M7Ca3 carbides are surrounded by a thin layer of martensite and in some instances an adjacent thicker layer of lath martensite. The initial secondary carbide precipitation occurs on sub-grain boundaries during cooling of the as-cast alloy. After a short time (0.25 h) at the destabilization temperature of 1273 K, cuboidal M23C6 precipitates within the austenite matrix with the cube-cube orientation relationship. After the normal period of 4 h at 1273 K, there is a mixture of M23C6 and M7C3 secondary carbides and the austenite is sufficiently depleted in chromium and carbon to transform substantially to martensite on cooling to room temperature. More... »

PAGES

707-711

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00367889

DOI

http://dx.doi.org/10.1007/bf00367889

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1021033621


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