Grain boundary crystallography and segregation in Ni-based superalloy INC738 manufactured by electron-beam powder bed fusion in as-built and annealed conditions

被引：0
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作者：
Luo, Ming [1 ]
Rielli, Vitor V. [1 ]
Farabi, Ehsan [1 ]
Liao, Xiaozhou [2 ]
Ringer, Simon P. [2 ]
Haghdadi, Nima [1 ]
Primig, Sophie [1 ]
机构：
[1] School of Materials Science & Engineering, UNSW Sydney, Kensington,NSW,2052, Australia
[2] Australian Centre for Microscopy & Microanalysis, and School of Aerospace, Mechanical & Mechatronic Engineering, The University of Sydney, Sydney,NSW,2006, Australia
来源：
Materials Characterization | 2024年 / 217卷
关键词：
The excellent high-temperature properties of Ni-based superalloy INC738 are due to its hierarchical microstructure; making it an ideal engineering material for high-temperature applications. Engineering parts are now increasingly made via electron beam powder bed fusion (EPBF); an additive manufacturing technique suitable for such hard-to-weld Ni-based superalloys; due to lower thermal gradients and unmatched scan path control. The thermal cycles induced by EPBF impact characteristics of the γ-matrix; precipitates; secondary phases such as carbides; grain boundary (GB) solute segregation and; in turn; properties including GB cohesion and strength. However; a more thorough understanding of the GB microstructure evolution with focus on GB chemistry and character is required to optimise properties. We systematically investigate texture; grain structure; GB habit planes; and GB segregation in INC738 fabricated with linear versus random EPBF scanning strategies. We show that random scanning is a suitable strategy to inhibit cracking; refine grains; and decrease segregation of Cr; Mo; C; and B at GBs. For both scanning strategies; γ/γ GBs predominantly terminate on {100} planes and are decorated with C; B; and W. Upon 2 h annealing at 1180 °C and 1250 °C; the GB character and texture are shown to remain stable despite a reduction in GB interfacial excess. After 24 h annealing at 1250 °C; GB segregation and depletion are nearly eradicated; while static recrystallisation is observed with a predominant formation of annealing twins and GBs terminating on {111} planes. These findings are critical for defect-free additive manufacturing of INC738 and similar grades for superior high-temperature performance. © 2024 The Authors;
D O I：
10.1016/j.matchar.2024.114421
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