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Choi, Baig-Gyu

Do, Jeonghyeon

Kim, In Soo

Song, Seungwoo

Yoo, Jisung

Yun, Dae Won

English

Engineering Conferences International

INFLUENCE OF /' LATTICE MISFIT ON HYDROGEN EMBRITTLEMENT MECHANISM OF SINGLE-CRYSTAL NICKEL-BASED SUPERALLOY CMSX-4   Jisung Yoo, Department of Hydrogen Materials Evaluation, Extreme Materials Institute, Korea Institute of Materials Science, Republic of Korea  Seungwoo Song,Operando Methodology and Measurement Team, Interdisciplinary Materials Measurement Institute, Korea Research Institute of Standards and Science,  Republic of Korea  Jeonghyeon Do, Department of High Temperature Materials, Extreme Materials Institute, Korea Institute of Materials Science,  Republic of Korea Dae Won Yun, Department of High Temperature Materials, Extreme Materials Institute, Korea Institute of Materials Science,  Republic of Korea In Soo Kim,Department of High Temperature Materials, Extreme Materials Institute, Korea Institute of Materials Science,  Republic of Korea  Baig-Gyu Choi, Department of High Temperature Materials, Extreme Materials Institute, Korea Institute of Materials Science,  Republic of Korea   Hydrogen embrittlement (HE), in which hydrogen (H) penetrates metals to cause a brittle fracture, is primarily influenced by microstructural factors. Nevertheless, the correlation between the interfacial lattice misfit of ' precipitates and  matrix, which is one of the main microstructural factors of nickel-based superalloy, and the HE behavior has not been experimentally clarified. Therefore, the single-crystal superalloy CMSX-4 was utilized to focus on the lattice misfit effect, excluding the typical H-trapping effect of grain boundaries and C-vacancies in carbide. The /' lattice misfit was controlled by coarsening of ' precipitates while maintaining a fully coherent interface and a volume fraction of 70% of ' precipitates. The effect of /' lattice misfit on HE mechanisms was investigated by correlating the results of digital image correlation (DIC), thermal desorption spectroscopy (TDS), silver decoration, focused ion beam (FIB), and high-resolution transmission electron microscopy (HRTEM). With the increase of /' lattice misfit, the HE mechanism of single-crystal nickel-based superalloy with active slip behavior transitioned from HELP mechanism to multiple cooperation of HELP and HEDE mechanisms, increasing HE sensitivity. As the H-trapping ability of /' interface enhances by strengthening of interfacial stress field due to the increase in lattice misfit, more H is concentrated at the /' interface. During this process, the H-enhanced slip behavior actively transferred H on the /' interface to cause HE synergistically.  

Influence of /\u27 lattice misfit on hydrogen embrittlement mechanism of single-crystal nickel-based superalloy CMSX-4

https://dc.engconfintl.org/cgi/viewcontent.cgi?filename=0&article=1028&context=hydrogen&type=additional

Influence of /\u27 lattice misfit on hydrogen embrittlement mechanism of single-crystal nickel-based superalloy CMSX-4

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Engineering Conferences International