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Deformation and Microstructure Evolution in Co-Ni-Cr-Mo Superalloy during Hot Working

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Abstract

Deformation and microstructure evolution in Co-33Ni-20Cr-10Mo superalloy during hot deformation are studied by carrying out compression tests between 950 °C and 1200 °C with an increment of 50 °C at strain rates of 0.1, 1, 10, and 30 s−1. The flow curves obtained for the aforementioned strain rates in this temperature range show that this alloy has high work-hardening characteristics; this is due to the strong dislocation-solute interactions associated with dynamic strain aging (DSA). Microstructures deformed at temperatures up to 1050 °C consist of numerous deformation twins and highly dense dislocations, which are attributed to the high activation energy for deformation and the relatively low strain-rate sensitivity m in the temperature range of 950 °C to 1200 °C. Dynamic recrystallization (DRX), which is dependent on the strain rate, occurs at T = 1000 °C, 1050 °C, 1100 °C, 1150 °C, and 1200 °C.

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Acknowledgments

This research was supported by a Cooperation of Innovative Technology and Advanced Research in Evolutional Area, the Ministry of Education, Culture, Sports, Science and Technology of Japan.

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Authors and Affiliations

  1. Institute of Materials Research, Tohoku University, Sendai, 980-8577, Japan

    Ika Kartika (Researcher), H. Matsumoto (Assistant Professor) & A. Chiba (Professor)

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  1. Ika Kartika
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  2. H. Matsumoto
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  3. A. Chiba
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Correspondence to A. Chiba.

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Manuscript submitted August 29, 2008.

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Kartika, I., Matsumoto, H. & Chiba, A. Deformation and Microstructure Evolution in Co-Ni-Cr-Mo Superalloy during Hot Working. Metall Mater Trans A 40, 1457–1468 (2009). https://doi.org/10.1007/s11661-009-9829-x

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