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Hot Deformation Characteristics of 9Cr-1.5Mo-1.25Co-VNb Ferritic-Martensitic Steel

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Abstract

The hot workability of 9Cr-1.5Mo-1.25Co-VNb ferritic-martensitic steel was investigated through hot compression tests using Gleeble simulator over a temperature range of 1223 K (950 °C) to 1573 K (1300 °C) and strain rates of 0.001 to 0.5 per second. Through an analysis of the stress(σ)–strain(ε) curves obtained during the hot compression tests, a processing map was developed to predict the hot workability, based on a dynamic material model (DMM). The processing map indicated that the hot workability deteriorates with an increase in the strain rate and a decrease in the temperature. During hot compression tests at temperatures exceeding 1473 K (1200 °C), δ-ferrite was formed along austenite grain boundaries and fine austenite grains then nucleated at the austenite/δ-ferrite interphase due to dynamic recrystallization (DRX), which was beneficial to the hot workability. At a temperature below 1223 K (950 °C), intergranular cracking occurred, after which a transmission electron microscopy (TEM) analysis revealed that this intergranular cracking resulted from the precipitation of intergranular M23C6 particles.

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Acknowledgments

J. Moon was supported financially by Doosan Heavy Industries & Construction of Republic of Korea. J. Moon was also supported financially by the Fundamental Research Program of the Korea Institute of Materials Science (KIMS) (POC3380 & PNK6500).

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Authors and Affiliations

  1. Steel Department, Metallic Materials Division, Korea Institute of Materials Science, 797 Changwondaero, Seongsangu, Changwon, Gyeongnam, 51508, Republic of Korea

    Joonoh Moon, Tae-Ho Lee, Chang-Hoon Lee & Seong-Jun Park

  2. Doosan Heavy Industries & Construction, 555 Gwigok-Dong, Seongsangu, Changwon, Gyeongnam, 51508, Republic of Korea

    Jong-Ho Shin & Jong-Wook Lee

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  1. Joonoh Moon
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  2. Tae-Ho Lee
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Correspondence to Joonoh Moon.

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Manuscript submitted December 27, 2018.

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Moon, J., Lee, TH., Lee, CH. et al. Hot Deformation Characteristics of 9Cr-1.5Mo-1.25Co-VNb Ferritic-Martensitic Steel. Metall Mater Trans A 50, 5670–5677 (2019). https://doi.org/10.1007/s11661-019-05487-4

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