Microstructure and Wear Resistance in Low Carbon-Equivalent Ductile Iron with Carbide Particles.
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| Title: | Microstructure and Wear Resistance in Low Carbon-Equivalent Ductile Iron with Carbide Particles. |
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| Authors: | Yans, Sajjad1 (AUTHOR), Yoozbashi, Mir Nariman2 (AUTHOR) n.yoozbashi@uast.ac.ir, Yazdani, Sasan1 (AUTHOR) yazdani@sut.ac.ir |
| Source: | International Journal of Metalcasting. May2026, Vol. 20 Issue 3, p1393-1407. 15p. |
| Subjects: | Wear resistance, Carbides, Microstructure, Heat treatment, Nodular iron, Martensitic structure |
| Abstract: | This study investigates the relationship between microstructure and wear resistance in low carbon-equivalent ductile iron containing FeC particles. Two ductile iron alloys with varying silicon contents (1.5% and 1.7%) were produced using a medium-frequency induction furnace and cast into Y-blocks. Nodularization was achieved via the in-mold method with Fe–Si–Mg. The alloys were subjected to normalizing, quenching, and austempering at different temperatures of 275, 325, and 375 °C to produce pearlitic, martensitic, and ausferritic matrix structures. Microstructural analysis was conducted using optical microscopy, scanning electron microscopy (SEM), and image analysis software to quantify eutectic carbide, ferrite, pearlite, graphite, retained austenite, and graphite nodularity. Hardness was measured using the Brinell Hardness Number (BHN), and wear resistance was evaluated via pin-on-disc testing according to ASTM G99. Studies on the coefficient of friction were also conducted to analyze the outputs of the wear tests. Results revealed that eutectic carbides significantly enhance wear resistance, particularly in low-temperature ausferritic and fine pearlitic matrixes. Specimen A, which contains less silicon and more carbide, exhibited superior wear resistance after austempering at 275 °C, achieving the lowest wear rate. Additionally, normalized specimens with higher pearlite content demonstrated improved wear resistance compared to quenched specimens, despite their lower hardness. The study highlights the complex interplay between carbide content, matrix structure, and wear mechanisms, emphasizing that optimal wear resistance is achieved through a combination of high carbide content and refined microstructures. These findings provide valuable insights for optimizing ductile iron compositions and heat treatments for industrial applications requiring enhanced wear resistance. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | This study investigates the relationship between microstructure and wear resistance in low carbon-equivalent ductile iron containing FeC particles. Two ductile iron alloys with varying silicon contents (1.5% and 1.7%) were produced using a medium-frequency induction furnace and cast into Y-blocks. Nodularization was achieved via the in-mold method with Fe–Si–Mg. The alloys were subjected to normalizing, quenching, and austempering at different temperatures of 275, 325, and 375 °C to produce pearlitic, martensitic, and ausferritic matrix structures. Microstructural analysis was conducted using optical microscopy, scanning electron microscopy (SEM), and image analysis software to quantify eutectic carbide, ferrite, pearlite, graphite, retained austenite, and graphite nodularity. Hardness was measured using the Brinell Hardness Number (BHN), and wear resistance was evaluated via pin-on-disc testing according to ASTM G99. Studies on the coefficient of friction were also conducted to analyze the outputs of the wear tests. Results revealed that eutectic carbides significantly enhance wear resistance, particularly in low-temperature ausferritic and fine pearlitic matrixes. Specimen A, which contains less silicon and more carbide, exhibited superior wear resistance after austempering at 275 °C, achieving the lowest wear rate. Additionally, normalized specimens with higher pearlite content demonstrated improved wear resistance compared to quenched specimens, despite their lower hardness. The study highlights the complex interplay between carbide content, matrix structure, and wear mechanisms, emphasizing that optimal wear resistance is achieved through a combination of high carbide content and refined microstructures. These findings provide valuable insights for optimizing ductile iron compositions and heat treatments for industrial applications requiring enhanced wear resistance. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 19395981 |
| DOI: | 10.1007/s40962-025-01647-y |
