Zhang J, Singer R (2004)
Publication Language: English
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2004
Pages Range: 939-946
Journal Issue: 3
URI: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=1842815219&origin=inward
Hot tearing susceptibility of two Ni-base superalloys, IN792 and CM247, during directional solidification was studied. Effects of grain-boundary (GB) misorientation on castability were examined by casting single-crystal (SC) and bicrystal (BC) specimens. Crack-free specimens were obtained in castings with GB misorientation angles of less than ∼12 deg. Severe cracking occurred if the GB angle was greater than 25 deg. Secondary dendrite arm length right at the GB was found to be larger than in the GB vicinity and to increase with GB misorientation. The amount of eutectic melt and foreign element segregation is also larger at the GB. The greater susceptibility of the GB to hot tearing is almost certainly caused by reduced strength compared to the grain interior. The reduced strength is either due to reduced secondary arm bridging because of geometrical constraints or due to the existence of a thin liquid film as a result of stronger segregation.
APA:
Zhang, J., & Singer, R. (2004). Effect of Grain-Boundary Characteristics on Castability of Nickel-Base Superalloys. Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 3, 939-946.
MLA:
Zhang, Jian, and Robert Singer. "Effect of Grain-Boundary Characteristics on Castability of Nickel-Base Superalloys." Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science 3 (2004): 939-946.
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