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Structure, nucleation, growth and morphology of secondary carbides in high chromium and Cr-Ni white cast irons.

Authors
Powell-GLF; Laird-G II
Source
J Mater Sci 1992 Jan; 27(1):29-35
NIOSHTIC No.
10011211
Abstract
Heat-treated high-chromium and cr-ni white cast irons are widely used by the mining and mineral industries for impact and abrasion resistance. With certain heat treatments, fe-cr carbides are precipitated within the chromium- and carbon-rich austenitic matrix, thereby destabilizing the austenite which transforms substantially to martensite on subsequent cooling. In this U.S. Bureau of Mines study, the crystal structures of these carbides were determined indirectly by referring electron microprobe analyses of the austenitic matrix to the appropriate isothermal solid-state sections of the fe-cr-c phase diagram and directly by microprobe analyses of exposed secondary carbides. The nucleation, growth, and morphology of these carbides were studied by a combination of selective removal of the austenitic matrix and subsequent scanning electron microscopy of the exposed carbides.
CODEN
JMTSAS
Publication Date
19920101
Document Type
OP; Journal Article
Fiscal Year
1992
NTIS Accession No.
NTIS Price
Identifying No.
OP 18-92
Issue of Publication
1
ISSN
0022-2461
NIOSH Division
ALRC
Source Name
Journal of Materials Science
State
OR
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