Effects of Primarily Solidified Dendrite and Thermal Treatments on the M23C6 Precipitation Behavior of High-Chromium White Iron

The precipitation behavior of M23C6 carbide during thermal treatment of high-Cr white iron with various fractions of primarily solidified dendrite was studied and reviewed. M23C6 precipitation in the primarily solidified dendrite occurred preferentially during conventional heat treatment, whereas it...

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Bibliographic Details
Published in:Metals (Basel ) 2021-11, Vol.11 (11), p.1690
Main Authors: Song, Young-Gy, Oh, Jun-Seok, Choi, Baig-Gyu, Jo, Chang-Yong, Lee, Je-Hyun
Format: Article
Language:English
Subjects:
Aging
Alloys
Austenite
Chemical precipitation
Chromium
conventional heat treatment
Cooling
dendrite volume fraction
Dendritic structure
Eutectic reactions
Eutectic temperature
Heat treating
high-Cr white iron
Low temperature
M23C6 precipitation behavior
Microscopy
modified heat treatment
Precipitation heat treatment
Solidification
Temperature
ThermoCalc
White iron
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Summary:The precipitation behavior of M23C6 carbide during thermal treatment of high-Cr white iron with various fractions of primarily solidified dendrite was studied and reviewed. M23C6 precipitation in the primarily solidified dendrite occurred preferentially during conventional heat treatment, whereas it occurred scarcely in the eutectic austenite. The reaction between M7C3 and austenite caused the dissolution of M7C3 into austenite, followed by precipitation of M23C6 along the periphery of eutectic M7C3. Relatively low-temperature thermal treatment (modified heat treatment) led to precipitation of M23C6 particles in the eutectic austenite, which is presumed to be caused by solubility difference depending on temperature.
ISSN:2075-4701
2075-4701
DOI:10.3390/met11111690