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Effect of boron on intergranular hot cracking in Ni-Cr-Fe superalloys containing niobiumSolidification mechanisms had a dominant influence on microfissuring behavior of the test group. Carbon modified the Laves formation significantly and showed that one approach to alloy design would be balancing carbide formers against Laves formers. Boron's strong effect on microfissuring can be traced to its potency as a Laves former. Boron's segregation to grain boundaries plays at best a secondary role in microfissuring.
Document ID
19900016799
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Thompson, R. G. (Alabama Univ. Birmingham, AL, United States)
Date Acquired
September 6, 2013
Publication Date
June 22, 1990
Subject Category
Metallic Materials
Report/Patent Number
NAS 1.26:184038
NASA-CR-184038
Accession Number
90N26115
Funding Number(s)
CONTRACT_GRANT: NAS8-38084
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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