Castability of directionally solidified nickel base superalloys

Journal article
(Original article)

Publication Details

Author(s): Heck K, Blackford J, Singer R
Journal: Materials Science and Technology
Publication year: 1999
Volume: 15
Journal issue: 2
Pages range: 213-220
ISSN: 0267-0836
Language: English


Grain boundary cracking during directional solidification of columnar grained nickel base superalloys has been investigated. A quantitative test has been developed that allows a classification of the castability of directionally solidified nickel base superalloys: CM247LC showed excellent castability, while IN792 showed severe cracking. The cracking was found to originate at a temperature near the solidus temperature (hot tearing). A number of experimental alloys based on the composition of IN792 were tested, with the effects of variations in hafnium, aluminium/titanium, carbon, boron and zirconium contents being examined. A combination of 0%B and 0.01%Zr shows significant promise. A number of approaches were applied to explain the cracking susceptibility. A relationship was found between a small nil ductility region, obtained by Gleeble testing, and good alloy castability for IN792 and CM247LC. A correlation between the eutectic content of the alloy and its cracking tendency was also found. At low (<5%) and high (>22%) amounts of eutectic, a significant reduction in cracking was apparent, while with intermediate amounts (15%), severe cracking was observed.

FAU Authors / FAU Editors

Singer, Robert Prof. Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)

How to cite

Heck, K., Blackford, J., & Singer, R. (1999). Castability of directionally solidified nickel base superalloys. Materials Science and Technology, 15(2), 213-220.

Heck, Katja, Jane Blackford, and Robert Singer. "Castability of directionally solidified nickel base superalloys." Materials Science and Technology 15.2 (1999): 213-220.


Last updated on 2018-08-09 at 07:10

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