Revisiting Nanoscale Microstructural Features of Alloy 680 to Understand Its Remarkable Mechanical Strength in the As-Welded Condition

会议论文
发表日期：

2024年

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Cleiton C. Silva,
Rafaella S. Silva,
Émerson M. Miná,
Giovani Dalpiaz,
Ricardo R. Marinho,
Marcelo T. P. Paes,
Marcelo F. Motta,
Hélio C. de Miranda,
Irina Wossack,
Alisson Kwiatkowski da Silva,
Christian H. Liebscher

摘要

The present study assesses the microstructureMicrostructure of a new Ni-based alloyNickel-based alloys filler metal, Inconel® 680, at high resolution to understand the underlying mechanisms behind its remarkable mechanical propertiesMechanical properties. Investigations using aberration-corrected (scanning) transmission electron microscopyTransmission electron microscopy (TEM/STEM) were performed to complement the previous microstructural analysis. The results from TEM analysis confirmed Nb-rich C14-type Laves phase precipitationPrecipitation, besides different types of carbides in the interdendritic spacings. However, the advanced microstructural characterisationCharacterisation has also shown a heterogeneous pattern in terms of microstructureMicrostructure between the cellular-dendrite core and interdendritic region. A higher dislocation density was noticed in the interdendritic spacings accompanied by nanometric precipitationPrecipitation. These nanoprecipitates were identified as being tined globular-shape γ″-Ni3Nb phase. The γ″-Ni3Nb phase precipitationPrecipitation resulted from an intense microsegregation of Nb during the solidificationSolidification. This precipitationPrecipitation of the γ″-Ni3Nb phase plays an essential role in the enhanced yield strength ofAlloy 680 alloy 680.