Effects of Chemical Composition and Solidification Rate on the Solidification Behavior of High-Cr White Irons
| Autor: | Hee Young Son, In Yong Jung, Baig Gyu Choi, Jong Ho Shin, Chang Yong Jo, Je Hyun Lee |
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| Jazyk: | angličtina |
| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Metals, Vol 14, Iss 3, p 276 (2024) |
| Druh dokumentu: | article |
| ISSN: | 14030276 2075-4701 |
| DOI: | 10.3390/met14030276 |
| Popis: | The effects of chemical composition and solidification rate on the solidification behavior of high-Cr white irons were investigated through directional solidification. Increasing the solidification rate in hypoeutectic alloys caused finer dendrite-arm spacing, as expected. The eutectic structure, which formed in the interdendritic region, was comprised of M7C3 and austenite; however, secondary dendrite arms of hypoeutectic alloys contained a few M7C3 particles that solidified prior to the eutectic structure. The transition from cellular to dendritic solidification occurred at a solidification rate between 50 µm/s and 100 µm/s in a near-eutectic alloy. In the near-eutectic alloy with cellular solidification, a directionally arrayed in-situ composite of M7C3/austenite formed within the cell. Speckle-like features appeared in the intercellular region due to M23C6 carbide precipitation during subsequent cooling after freezing. Like dendrite-arm spacing in hypoeutectic alloys, the inter-speckle spacing and the inter-fiber spacing became finer with an increasing solidification rate in the cellular solidification range. |
| Databáze: | Directory of Open Access Journals |
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