Çift Fazlı (α + M) Küresel Grafitli Dökme Demirlerde Martenzit Hacim Oranı-Mekanik Özellikler-Dislokasyon Yoğunluğu Arasındaki İlişkilerin İncelenmesi

The present study was conducted to uncover effects of partitioning treatment on Cu–Ni–Mo alloyed ductile iron (DI) austempered at different temperatures. For this purpose, the DI samples, produced via sand casting, were austenitized at 900 °C for 60 min, followed by austempering at the temperatures of 275–325–375 °C for 120 min and afterwards a partitioning treatment was applied at 200 °C for 15 min. In the characterization studies, dilatometer, image analysis, JMat-Pro, mechanical tests, XRD, optical microscope, and scanning electron microscope (SEM) equipped with EBSD detector were utilized. Characterization studies showed that the effects of partitioning treatment were directly correlated with austempering temperature and high carbon austenite volume fraction changed in the range of 19.48–35.45%. That redistribution of carbon (C) between bainitic ferrite and high carbon austenite occurred, in turn, the carbon content of high carbon austenite increased with the partitioning treatment irrespective of austempering temperature were uncovered. Furthermore, the partitioning treatment considerably changed the grain morphologies of both high carbon austenite and banitic ferrite. As a consequence of these microstructural differences, the highest tensile strength of 1489.2 MPa was established in the sample austempered at 275 °C and partitioned at 200 °C, whereas the highest ductility of 5.61% acquired at the austempering temperature of 375 °C.

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Influence of partitioning treatment on microstructure and mechanical properties of an alloyed ductile iron austempered at different temperatures

Nalçaci

Davut

Neite

et al. 2023

Materials Testing

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Effect of Nitriding Process on Wear Behavior of Dual Phase (Ferrite+Martensite) Ductile Cast Iron

ERDOĞAN

TOY

KESKİN

et al. 2022

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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Figure. Schemetical representation of the heat treatment routes to produce surface nitrided dual phase ductile cast iron (blue line)Purpose: In this study, it was aimed to improve the surface hardness by applying gas nitriding treatment to dual-phase ductile cast iron and to produce ductile cast irons with a good strengthductility combination. Thus, it has been tried to develop a ductile cast iron with high wear resistance, strength, and ductility.Theory and Methods: Ductile cast iron specimens with a dual-phase microstructure consisting of ferrite + martensite were produced by oil quenching at 70 °C after intercritical austenitizing at 800 ⁰C in the ferrite + austenite zone. Instead of the tempering process, nitriding treatment was applied to the dual-phase ductile cast iron specimens at 560 °C for 540 minutes. Optical microscope and XRD analysis were performed for microstructural characterization of nitrided dual-phase ductile cast iron specimens. The wear properties were tested with a tribometer. Results:In ductile cast iron, microstructures consist of a hard nitride layer (10 µm white layer) on the surface and a ferrite + tempered martensite (43% martensite volume fraction) structure in the center can be produced by oil quenching from intercritical austenitizing and nitriding treatment. Surface hardness of 510 HV in nitrided dual-phase ductile cast iron, 193 HV in dualphase ductile cast iron, and 353 HV in austempered KGDD were obtained. The lowest weight loss and coefficient of friction were obtained in nitrided dual-phase ductile cast iron. The highest weight loss and friction coefficient values with wear were obtained in dual-phase ductile cast iron. Conclusion:It can be concluded that the wear resistance of nitrided dual-phase ductile cast iron is 2 times higher than that of dual-phase ductile cast iron and austempered ductile cast iron.

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Çift Fazlı (α + M) Küresel Grafitli Dökme Demirlerde Martenzit Hacim Oranı-Mekanik Özellikler-Dislokasyon Yoğunluğu Arasındaki İlişkilerin İncelenmesi

Cited by 2 publications

References 37 publications

Influence of partitioning treatment on microstructure and mechanical properties of an alloyed ductile iron austempered at different temperatures

Influence of partitioning treatment on microstructure and mechanical properties of an alloyed ductile iron austempered at different temperatures

Effect of Nitriding Process on Wear Behavior of Dual Phase (Ferrite+Martensite) Ductile Cast Iron

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