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Influence of Segregation on Microstructure and Hot Workability of Grade 250 Maraging Steel

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Abstract

The optimal process parameters of grade 250 maraging steel for hot forging were investigated with a process map and microstructure analysis. To generate the process map, hot compression tests were performed at 800–1200 °C and strain rates of 0.01–5 s−1. The flow stress–strain curves were calibrated by Bayesian artificial neural network (ANN) modeling to compensate the heat generated by dynamic deformation. The Ni and Mo segregation during the solidification of the ingot caused alternating layers of Ni- and Mo-rich and -lean bands, which affected the recrystallization behavior during hot compression. According to the calculated process map, 1100–1200 °C × 0.01–0.7 s−1 and 1000–1200 °C × 0.01–0.2 s−1 are favorable process conditions that ensure wide process windows in terms of strain rate and temperature, respectively. The common features of the microstructure deformed under both conditions were relatively coarse martensite blocks and low values in the electron backscattered diffraction (EBSD) kernel average misorientation (KAM) results (i.e., low residual stresses), which were attributed to a low fraction of fine martensite block region.

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Acknowledgements

This research was supported by a grant from the Fundamental R&D Program of Korea Institute of Materials Science (PNK6750) funded by the Ministry of Science and ICT, Republic of Korea. The authors are grateful to HANSCO for the material supply.

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Authors and Affiliations

  1. High Temperature Materials Center, Korea Institute of Materials Science, Changwon, 51508, Republic of Korea

    Hyungsoo Lee, Hi Won Jeong, Seong Moon Seo, Dae Won Yun, Kyungmi Park & Young Soo Yoo

  2. R&D Center, HANSCO Co., Ltd., Daejeon, 34115, Republic of Korea

    Kwang Hyuk Yim

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  1. Hyungsoo Lee
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  2. Hi Won Jeong
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Lee, H., Jeong, H.W., Seo, S.M. et al. Influence of Segregation on Microstructure and Hot Workability of Grade 250 Maraging Steel. Met. Mater. Int. 27, 691–704 (2021). https://doi.org/10.1007/s12540-020-00771-0

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