Effect of plastic anisotropy on tensile strength of single crystals of an Ni-based superalloy

Journal Article · Fri Dec 31 04:00:00 EST 1999 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(99)00313-9· OSTI ID:20023076

Kakehi, K

Turbine blades are designed so that their primary orientation is within 10 to 15{degree} of the <001> axis to insure a low modulus. The secondary dendritic direction (<010> direction) is usually randomly orientated with respect to the longitudinal direction of the turbine blade. The strengths of single crystals are influenced by the crystallographic orientations not only in the tensile direction but also in the normal direction of the specimen because a single crystal possesses intrinsic plastic anisotropy. The air-cooled turbine blades, which have a complicated hollow structure, are composed of sections of various thicknesses. Therefore, the mechanical properties of each blade section will depend on plastic anisotropy and the stress state as well as stress in the longitudinal direction. In previous studies, in an experimental single crystal alloy of an Ni-based superalloy, it has been revealed that {l_brace}111{r_brace}<101>-type slip systems were activated during tensile tests. In this study, by using the experimental alloy which shows distinct active slip systems, the influence of crystallographic orientations and plastic anisotropy on the strength and ductility of single crystals of the Ni-based superalloy have been investigated on the assumption that the {l_brace}111{r_brace}<101> slip systems operate.

• Research Organization: Tokyo Metropolitan Univ. (JP)
• OSTI ID: 20023076
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 2 Vol. 42; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
ANISOTROPY
DEFORMATION
GRAIN ORIENTATION
MONOCRYSTALS
NICKEL BASE ALLOYS
TEMPERATURE RANGE 0400-1000 K
TENSILE PROPERTIES
TURBINE BLADES