Effect of Dendrite Fraction on the M23C6 Precipitation Behavior and the Mechanical Properties of High Cr White Irons

High Cr white irons with various fractions of primary dendrite have been prepared through the modification of their chemical composition. Increasing C and Cr contents decreased the primary dendrite fraction. Eutectic solidification occurred with the phase fraction ratio of austenite: M7C3 = 2.76:1....

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Bibliographic Details
Published in:Metals (Basel ) 2021-10, Vol.11 (10), p.1576
Main Authors: Oh, Jun-Seok, Song, Young-Gy, Choi, Baig-Gyu, Bhamornsut, Chalothorn, Nakkuntod, Rujeeporn, Jo, Chang-Yong, Lee, Je-Hyun
Format: Article
Language:English
Subjects:
Alloys
Austenite
Carbon
carbon equivalent
Chemical composition
Chemical precipitation
Chromium
Cooling
dendrite volume fraction
Dendritic structure
Destabilization
Directional solidification
eutectic carbide
hardness
Heat treatment
high chromium white irons
High temperature
Mathematical analysis
Mechanical properties
Microscopy
Solidification
ThermoCalc
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Summary:High Cr white irons with various fractions of primary dendrite have been prepared through the modification of their chemical composition. Increasing C and Cr contents decreased the primary dendrite fraction. Eutectic solidification occurred with the phase fraction ratio of austenite: M7C3 = 2.76:1. The measured primary dendrite fractions were similar to the calculated results. ThermoCalc calculation successfully predicted fractions of M7C3, austenite, and M23C6. Conventional heat treatment at high temperature caused a destabilization of austenite, releasing it’s solute elements to form M23C6 carbide. Precipitation of M23C6 during destabilization preferentially occurred within primary (austenite) dendrite, however, the precipitation scarcely occurred within austenite in eutectic phase. Thus, M23C6 precipitation by destabilization was relatively easy in alloys with a high fraction of primary dendrite.
ISSN:2075-4701
2075-4701
DOI:10.3390/met11101576