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Investigation on microstructure and mechanical properties of a vacuum brazed joint of gamma '-strengthened Co-based single crystal superalloy before and after the post-bond heat treatment
Wang, S. Y.; Sun, Y.; Hou, X. Y.; Cui, C. Y.; Sun, X. F.; Zhou, Y. Z.
2020-07-01
Source PublicationVACUUM
Volume177
AbstractTransient liquid phase bonding of gamma'-strengthened Co-based superalloy was carried out using Ni-based filler alloy. The effects of post-bond heat treatment (PBHT) on the microstructure and mechanical properties of the gamma'-strengthened Co-based superalloy joint were systematically investigated. Two distinct regions were observed in the isothermally solidified zone: primary gamma' phase zone (PZ) and secondary gamma' phase zone (SZ). The diffusion of Al from the substrate to the liquid interlayer proves to be the main reason for the precipitation of gamma' phases, showing a significant growth trend after the PBHT. The joint after the PBHT shows higher microhardness in most areas of the bonding zone. However, some parts of the diffusion affected zone show the contrary result. This could attribute to the competition consequence of the solid solution strengthening and second phase strengthening. Furthermore, the post-bond heat treated joint exhibited higher yield strength and longer stress rupture life. Our experimental results help to better understand the microstructural characteristic of the new type Co-based superalloy and provide a direction for further optimizing the brazing joint.
DOI10.1016/j.vacuum.2020.109413
WOS IDWOS:000538148400058
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/155693
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Wang, S. Y.,Sun, Y.,Hou, X. Y.,et al. Investigation on microstructure and mechanical properties of a vacuum brazed joint of gamma '-strengthened Co-based single crystal superalloy before and after the post-bond heat treatment[J]. VACUUM,2020,177.
APA Wang, S. Y.,Sun, Y.,Hou, X. Y.,Cui, C. Y.,Sun, X. F.,&Zhou, Y. Z..(2020).Investigation on microstructure and mechanical properties of a vacuum brazed joint of gamma '-strengthened Co-based single crystal superalloy before and after the post-bond heat treatment.VACUUM,177.
MLA Wang, S. Y.,et al."Investigation on microstructure and mechanical properties of a vacuum brazed joint of gamma '-strengthened Co-based single crystal superalloy before and after the post-bond heat treatment".VACUUM 177(2020).
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