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

Hyungsoo Lee; Hi Won Jeong; Seong Moon Seo; Dae Won Yun; Kyungmi Park; Kwang Hyuk Yim; Young Soo Yoo

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자료유형: 학술저널

저자정보: Hyungsoo Lee (Korea Institute of Materials Science) Hi Won Jeong (Korea Institute of Materials Science) Seong Moon Seo (Korea Institute of Materials Science) Dae Won Yun (Korea Institute of Materials Science) Kyungmi Park (Korea Institute of Materials Science) Kwang Hyuk Yim (HANSCO Co. Ltd.) Young Soo Yoo (Korea Institute of Materials Science)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.4

발행연도: 2021.1

수록면: 691 - 704 (14page)

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The optimal process parameters of grade 250 maraging steel for hot forging were investigated with a process map and microstructureanalysis. To generate the process map, hot compression tests were performed at 800–1200 °C and strain rates of0.01–5 s−1. The flow stress–strain curves were calibrated by Bayesian artificial neural network (ANN) modeling to compensatethe heat generated by dynamic deformation. The Ni and Mo segregation during the solidification of the ingot causedalternating 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 favorableprocess conditions that ensure wide process windows in terms of strain rate and temperature, respectively. The commonfeatures of the microstructure deformed under both conditions were relatively coarse martensite blocks and low values in theelectron backscattered diffraction (EBSD) kernel average misorientation (KAM) results (i.e., low residual stresses), whichwere attributed to a low fraction of fine martensite block region.

#Maraging steel · Artificial neural network · Process map · Hot compression · EBSD · Segregation

참고문헌 (43)

참고문헌 신청

W. Sha / 2009 / Maraging steels: Modeling of microstructure, properties and applications / Woodhead Publishing

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