Kim, Cham Il LEE, JI YEONG Kim, Won Tae Park, Eun Woo Kim, Do Hyang 2024-05-29T01:00:13Z 2024-05-29T01:00:13Z 2024-05-28 2024-06 0921-5093 https://pubs.kist.re.kr/handle/201004/149925 The objective of the present study was to investigate whether the crack propagation resistance of boron-containing FeNi-based superalloy could be enhanced by healing treatment. The healing treatment was performed by pre-straining and subsequent heat treatment, resulting in a pronounced boron segregation zone at the interface. Formation of boron segregation zone reinforced the crack propagation path, thereby effectively enhancing the mechanical properties of FeNi-based superalloy. The tested alloys were prepared by hot-rolling followed by aging treatment, resulting in precipitation of γ′-Ni3Ti and γ''-Ni3Nb embedded in the γ matrix. After pre-straining and healing heat treatment, η-Ni3Ti phase formed at the grain boundary, leading to the formation of a boron segregation zone at the interface between the η-Ni3Ti phase and γ matrix. Both strength and ductility were improved with increasing boron content from 0 at% to 0.2 at% after healing treatment. The spontaneous segregation of boron at the precipitate-matrix interface played a role in enhancing both strength and ductility by interface strengthening. Moreover, it was revealed that a critical amount of boron segregation is required for interface strengthening. Dislocation density analysis revealed that the recovery effect was weaker in alloys with boron than in those without it, leading to a more pronounced work-hardening effect. English Elsevier BV Enhanced crack propagation resistance after healing treatment by addition of boron in FeNi-base superalloy Article 10.1016/j.msea.2024.146664 1 Materials Science and Engineering: A, v.903 Materials Science and Engineering: A 903 N scie scopus 001245326100001 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Science & Technology - Other Topics Materials Science Metallurgy & Metallurgical Engineering Article GRAIN-BOUNDARY SEGREGATION NITRIDE PRECIPITATION MECHANICAL-PROPERTIES FRACTURE-BEHAVIOR GAMMA-PRIME STRENGTH PHASE ALLOY STEEL SIMS FeNi-Based superalloy Healing treatment Boron segregation Interface strengthening