About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
2020 Technical Division Student Poster Contest
|
Presentation Title |
SPG-24: Prevention of Crack Propagation in Fe-Ni Base Superalloy based on Spontaneous Precipitation of Metallic Boride |
Author(s) |
Chamil Kim, Jaeik Hyun, Woochul Kim, Jeongsoo Kim, Yongjoo Kim, Wontae Kim, Dohyang Kim |
On-Site Speaker (Planned) |
Chamil Kim |
Abstract Scope |
To improve the high-temperature properties of superalloy, the formation of the micro/nano crack formation should be prevented or delayed. Recently, novel concept to heal micro/nano crack based on spontaneous precipitation has been reported in several alloy systems. That is, the localized precipitation occurs in the regions where micro/nano-cracks are presented by thermodynamic/kinetic driving force at high temperatures. In this study, we applied the precipitation-induced self-healing concept to Fe-Ni-based superalloys. Each alloy with different content of boron showing γ-γ’ microstructure is fabricated through heat treatment without any precipitation of boride before deformation. To observe the crack healing phenomena, pre-strained tensile specimens are annealed at 650 ℃. Besides, nano-SIMS characterization is carried out to observe the dynamic precipitation during the creep test. Consequently, micro-crack filling is verified by metallic boride precipitation.Due to this self-healing effect, the boron-containing alloys exhibit longer elongation and creep rupture time than the alloy without boron. |
Proceedings Inclusion? |
Undecided |