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Effect of Austempering Times on the Microstructures and Mechanical Properties of Dual-Matrix Structure Austempered Ductile Iron (DMS-ADI)

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Abstract

In this study, the effect of the austempering times on the microstructures and mechanical properties of dual-matrix structure austempered ductile iron (DMS-ADI) was investigated. With this aim, unalloyed as-cast ductile iron tensile samples were austenitized at 810 °C for 30 min to intercritical austenitizing followed by austempering at 350°C for various austempering times (45 min to 180 min). Experimental results showed that dual-matrix structures consisting of proeutectoid ferrite + ausferrite were obtained in austempered ductile iron from intercritical austenitizing temperatures. It was determined that as the austempering time increased, the ausferritic structure became considerably clear and its volume fraction was almost constant (45–47%) after 90 min of austempering time. The yield and tensile strength of the samples decreased and the total elongation and breaking energy increased with increasing austempering times, but after the 120-min austempering time, both the total elongation and breaking energy of the samples decreased. It was established that the austempering times had no significant effect on the morphology of ausferrite. The best mechanical properties were obtained between 70- and 130-minute austempering times that can be defined as the processing window. In addition, it was determined that the DMS-ADI had similar austempering kinetics with the ADI.

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Acknowledgements

The authors would like to thank Gazi University Scientific Research Projects Coordination Unit for financial support of the study.

Funding

This work was supported by the Gazi University Scientific Research Projects Coordination Unit under Grant numbers 07/2020-17 and 07/2020-19.

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Authors and Affiliations

  1. Department of Machinery and Metal Technologies, Technical Sciences Vocational School, Hacettepe University, Baskent Organize Sanayi Bolgesi, Malıkoy, 06909, Sincan, Ankara, Turkey

    Ahmet Uyar

  2. Department of Metallurgical and Materials Engineering, Faculty of Technology, Gazi University, Teknikokullar, 06560, Ankara, Turkey

    Omer Sahin, Burak Nalcaci & Volkan Kilicli

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  1. Ahmet Uyar
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  2. Omer Sahin
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Contributions

AU was involved in experimental studies (casting and heat treatments), investigation, creating figures, and writing. OS was involved in experimental studies (mechanical tests and microstructural characterization), investigation, creating figures, and writing. BN was involved in experimental studies (XRD analysis and high-carbon retained austenite calculation), investigation, creating figures, and writing. VK was involved in conceptualization, writing and editing, project administration, and funding acquisition.

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Correspondence to Volkan Kilicli.

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Uyar, A., Sahin, O., Nalcaci, B. et al. Effect of Austempering Times on the Microstructures and Mechanical Properties of Dual-Matrix Structure Austempered Ductile Iron (DMS-ADI). Inter Metalcast 16, 407–418 (2022). https://doi.org/10.1007/s40962-021-00617-4

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