Cham Il Kim Lee, Ji Yeong Won Tae Kim Eun Soo Park Heon Kang Do Hyang Kim 2025-09-29T01:30:12Z 2025-09-29T01:30:12Z 2025-09-27 2025-11 1044-5803 https://pubs.kist.re.kr/handle/201004/153247 This study investigates the effects of boron on microstructural evolution and creep properties in a FeNi-base superalloy, showing that boron plays a role in significant enhancement of the creep resistance by suppression of recrystallization during creep. Detailed analyses using transmission electron microscopy, atom probe tomography, and electron backscattered diffraction revealed that boron segregates at grain boundaries and at the interface between the matrix and the precipitate, thereby increasing grain boundary cohesion and suppressing dynamic recrystallization. Moreover, boron stabilizes the grain structure by increasing the recrystallization threshold, thus inhibiting recrystallization during creep. The effect of boron in strengthening the grain boundary is particularly pronounced in the creep test with lower strain rate, where it effectively extends the creep rupture life, while this effect is less emphasized in the high temperature tensile test with higher strain rate. These findings suggest that the addition of boron is crucial for the optimization of the high-temperature performance of FeNi-base superalloys. English Elsevier BV Boron-induced suppression of recrystallization during creep in FeNi-based superalloy Article 10.1016/j.matchar.2025.115580 1 Materials Characterization, v.229, no.Part B Materials Characterization 229 Part B N scie scopus 001585808900003 Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Materials Science, Characterization & Testing Materials Science Metallurgy & Metallurgical Engineering Article TEMPERATURE EMBRITTLEMENT MECHANICAL-PROPERTIES GAMMA-PRIME GRAIN NI PRECIPITATION STABILITY FRACTURE ELEMENTS PHASES FeNi-based superalloy Boron segregation Suppression of recrystallization