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An Investigation into the Fracture Behavior of the IN625 Hot-Rolled Superalloy

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Abstract

In the present study, an experimental investigation of the effects of the rolling direction on the fracture behavior of the IN625 superalloy by using the digital image correlation method is studied. The three different specimens in the different rolling directions (0°, 45°, and 90°) were interpreted using a hot-rolled IN625 plate for the tests. To evaluate the fracture behavior of the IN625, crack mouth opening displacement (CMOD), crack length, the full-field displacement of the CT specimens were measured using the digital image correlation method, and the KI, KII, and T-stress were calculated for all specimens. The scanning electron microscopy is used to evaluate fracture mechanisms and characteristics of the specimens. The results demonstrate that the fracture parameters of the IN625 superalloy can be affected by the rolling direction and specimen B has a greater CMOD value than other specimens. Also, the SIFs and T-stress increased at first and then decreased by increasing the crack length for all specimens. Furthermore, the fractography showed that a combination of ductile fracture dimples and quasi-cleavage facets, specific to the equiaxed Ni-based superalloy, have occurred in all specimens.

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Acknowledgments

The authors would like to thank Dr. M. Moazami from Fatigue and Fracture Laboratory of Iran University of Science and Technology, Dr. A. Ardeshiri Lordejani from Politecnico di Milano University for provided expertise that greatly assisted the research. Also, the first author would like to express his great appreciation to Ms. Z. Khoshkhou-Gilavaei from the University of Tehran for editorial helps that greatly improved the manuscript.

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  1. Vehicle Dynamical Systems Research Laboratory, School of Automotive Engineering, Iran University of Science and Technology (IUST), 16844, Narmak, Tehran, Iran

    B. Salehnasab, D. Zarifpour & J. Marzbanrad

  2. School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran

    G. Samimi

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  1. B. Salehnasab
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Correspondence to J. Marzbanrad.

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Salehnasab, B., Zarifpour, D., Marzbanrad, J. et al. An Investigation into the Fracture Behavior of the IN625 Hot-Rolled Superalloy. J. of Materi Eng and Perform 30, 7171–7184 (2021). https://doi.org/10.1007/s11665-021-05895-x

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