Simulation of Phase Equilibria in High Chromium White Cast Irons
In this study, using the Materials Calculator software program, the pseudo binary phase diagrams (i.e. isoplethal maps) of high chromium white cast irons (~19% in weight) with different molybdenum contents were simulated. In order to test the accuracy of the calculated phase diagrams, the transforma...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Bursa Uludag University
2018-12-01
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| Series: | Uludağ University Journal of The Faculty of Engineering |
| Subjects: | |
| Online Access: | https://dergipark.org.tr/tr/pub/uumfd/issue/39804/333701 |
| Summary: | In this study, using the Materials Calculator software program, the
pseudo binary phase diagrams (i.e. isoplethal maps) of high chromium white cast
irons (~19% in weight) with different molybdenum contents were simulated. In
order to test the accuracy of the calculated phase diagrams, the transformation
temperatures read from the diagrams at certain compositions were compared with
the phase transformation temperatures measured using Differential Scanning
Calorimetry (DSC) analysis of the samples produced by casting in the same
composition followed by slow cooling. With the same purpose, low temperature
phases read from the phase diagrams were compared with the crystalline phases
determined by X-Ray Diffraction (XRD) of the casted samples. Simulated diagrams
predicted an increase in the amount of secondary M23C6carbides with increasing molybdenum content. The
validity of this prediction was tested by determining the phase distribution
and phase compositions in the casted samples by means of metallographic
examinations and Scanning Electron Microscopy (SEM) - Energy Dispersive
Spectroscopy (EDS) analyzes. When the hardness values of the samples were taken
into consideration, it was seen that the hardness increased from 44.90 to 51.05
HRC with a 1% increase in Mo content and a corresponding increase in the amount
of secondary carbides without any heat treatments. Results show that
theoretical predictions and experimental measurements are in accord and
estimating phase equilibria in multi-component systems is of practical
importance. |
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| ISSN: | 2148-4147 2148-4155 |