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- Title
Analysis of Graphite Nuclear in Spheroidal Graphite Cast Iron and Mechanism of Nodule Count Increase by Bismuth Oxide.
- Authors
Hiroaki Tsuji; Hiroyuki Chono; Nobuya Yamamoto; Tokio Kai; Yoshio Igarashi
- Abstract
In order to elucidate the mechanism of nodule count increase by Bi, we analyzed spheroidal graphite cast iron with increased nodule count by Bi addition. In the Scanning Electron Microscope - Energy Dispersive X-ray Spectrometry (SEM-EDS) analysis, Bi was identified to be present near the center of the spheroidal graphite. The center of this spherical graphite was pretreated by Focused Ion Beam (FIB) micro sampling method to prepare analytical sample and analyzed by Transmission Electron Microscope - Energy Dispersive X-ray Spectrometry (TEM-EDS). As a result, it was found that Bi exists as BiLaCeSb oxide on the outer periphery of the graphite core centered on (MgCa) S. To verify the effect of the BiLaCeSb oxide on the increase in nodule count, we first used mechanical alloying to prototype a BiLaCeSb oxide having the same composition as that observed via TEM-EDS. This oxide was then added to the molten spheroidal graphite cast iron. As a result, nodule count did not increase with the addition of the prototype BiLaCeSb oxide alone, but when the prototype BiLaCeSb oxide and FeSi inoculants were mixed and added, the nodule count increased more than when only the FeSi inoculants was added. From these results, it is considered that the effect of increasing nodule count by Bi addition is that Bi acts on graphite nucleus as an oxide.
- Subjects
SCANNING electron microscopes; ENERGY dispersive X-ray spectroscopy; CHARACTERISTIC X-ray spectrum; FOCUSED ion beams; ION bombardment
- Publication
Materials Transactions, 2021, Vol 62, Issue 9, p1393
- ISSN
1345-9678
- Publication type
Article
- DOI
10.2320/matertrans.F-M2021836