Son, H.Y.; Jung, I.Y.; Choi, B.G.; Shin, J.H.; Jo, C.Y.; Lee, J.H. Effects of Chemical Composition and Solidification Rate on the Solidification Behavior of High-Cr White Irons. Metals2024, 14, 276.
Son, H.Y.; Jung, I.Y.; Choi, B.G.; Shin, J.H.; Jo, C.Y.; Lee, J.H. Effects of Chemical Composition and Solidification Rate on the Solidification Behavior of High-Cr White Irons. Metals 2024, 14, 276.
Son, H.Y.; Jung, I.Y.; Choi, B.G.; Shin, J.H.; Jo, C.Y.; Lee, J.H. Effects of Chemical Composition and Solidification Rate on the Solidification Behavior of High-Cr White Irons. Metals2024, 14, 276.
Son, H.Y.; Jung, I.Y.; Choi, B.G.; Shin, J.H.; Jo, C.Y.; Lee, J.H. Effects of Chemical Composition and Solidification Rate on the Solidification Behavior of High-Cr White Irons. Metals 2024, 14, 276.
Abstract
The effects of chemical composition and solidification rate on the solidification behavior of high-Cr white irons were investigated through directional solidification. Increasing the solidi-fication rate in hypoeutectic alloys caused the finer dendrite arm spacing as expected. The eutec-tic structure which formed in the interdendritic region comprised of M7C3 and austenite, how-ever, secondary dendrite arms of hypoeutectic alloys contained a few M7C3 particles that solidi-fied prior to the eutectic structure. The transition from cellular to dendritic solidification oc-curred 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 feature 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-fibre spacing became finer with increasing solidification rate in the cellular solidification range.
Chemistry and Materials Science, Materials Science and Technology
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