Influence of Boron on the Microstructural Evolution, Impact and Creep Properties Stability of IN718 Superalloy During Long-Term Aging
Zhiyuan Wang, Yingjie Liu, Ning An, Jia Man, Xin Xin, Jianyong Li, Maocheng Ji, Wenru Sun
TL;DR
This study examines how boron affects the microstructure and mechanical properties of IN718 superalloy during long-term aging.
Contribution
The novel finding is that boron suppresses δ phase growth and improves mechanical stability through grain boundary effects.
Findings
Boron suppresses δ phase precipitation and growth by grain boundary segregation.
Boron improves impact toughness and creep stability by enhancing grain boundary cohesion.
Creep deformation mechanism in B-modified alloys shifts with aging time.
Abstract
The impact of boron (B) on the microstructure evolution and stabilization of mechanical properties in the IN718 superalloy during aging at 680 °C for 3000 h is investigated. The results indicated that B had negligible effects on grain size and the intragranular γ″ phase growth. In contrast, it effectively suppressed the precipitation and growth of the δ phase during long-term aging, which is attributed to grain boundary segregation of B that retards the diffusion of alloying elements. Adding B could improve the impact toughness and stability of the creep properties of the alloy. The primary mechanism is that the addition of B enhances grain boundary cohesion and suppresses the coarsening of the δ phase, while the beneficial effect of B on mechanical stability becomes negligible during the later stages of aging, as the severe coarsening of grain boundary phases offsets the enhanced grain…
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Taxonomy
TopicsHigh Temperature Alloys and Creep · Additive Manufacturing Materials and Processes · Aluminum Alloy Microstructure Properties