Results 191 to 200 of about 2,118 (231)

Directionally solidified Soviet superalloy, ZHS6-K

Journal of Materials Science, 1981
Directional solidification of the Soviet superalloy, ZHS6-K, has been carried out in an argon atmosphere. Tensile and stress-rupture properties have been measured for the investment cast and directionally solidified (DS) alloy. The DS alloy shows a several fold increase in rupture life and ductility compared with the investment cast alloy It also shows
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Simulation of microsegregation and microstructural evolution in directionally solidified superalloys

Materials Science and Technology, 2000
AbstractA two-dimensional model for solidification and secondary phase precipitation in directionally solidified superalloys is presented, which makes use of a shape function approximation for the isothermal cross-section of the primary dendrites. The phase boundary is represented by a diffuse interface on a finite difference grid, as in phasefield ...
B. Böttger, U. Grafe, D. Ma, S.G. Fries
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Development of a heat treatment for a directionally solidified cobalt-base superalloy

Metallurgical and Materials Transactions A, 1999
Cobalt-base superalloys derive their strength from solid solution and carbide precipitation. Precipitation hardening is their primary strengthening mechanism. However, cobalt-base superalloys are rarely heat treated and used in the as-cast condition, for heat treatment deteriorates alloy ductility severely.
W. H. Jiang, H. R. Guan, Z. Q. Hu, W. H. Jiang   +3 more
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Thermomechanical Fatigue Behavior of a Directionally Solidified Ni-Base Superalloy

Journal of Engineering Materials and Technology, 2005
A continuum crystal plasticity model is used to simulate the material behavior of a directionally solidified Ni-base superalloy, DS GTD-111, in the longitudinal and transverse orientations. Isothermal uniaxial fatigue tests with hold times and creep tests are conducted at temperatures ranging from room temperature (RT) to 1038°C to characterize the ...
M. M. Shenoy, A. P. Gordon, D. L. McDowell, R. W. Neu   +3 more
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A Cyclic Life Prediction Approach for Directionally Solidified Nickel Superalloys

Journal of Engineering for Gas Turbines and Power, 2009
Abstract The performance of heavy duty gas turbines is closely related to the material capability of the components of the first turbine stage. In modern gas turbines single crystal (SX) and directionally solidified (DS) nickel superalloys are applied, which, compared with their conventionally cast version, hold a higher cyclic life and ...
Roland Mu¨cke, Piyawan Woratat
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Strength-ductility paradox in a directionally solidified nickel base superalloy

Materials Letters, 2018
Abstract In contrast to other structural alloys, yield strength of nickel base superalloys either remains constant or increases with temperature up to 700–800 °C making them more suitable for high temperature structural applications. However, the increase in yield strength is usually accompanied by a decrease in ductility.
R.K. Rai, J.K. Sahu
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Microstructural stability of the directionally solidified γ′-base superalloy IC6

Materials Science and Engineering: A, 1993
Abstract The microstructural stability of an NiAlMo directionally solidified γ′-base superalloy, IC6, was investigated and the effect on microstructure and tensile properties at room temperature and 760°C of high temperature aging at 900–1100°C for up to 200 h was studied. The experimental results show that the tensile strength decreases with aging
Y.F. Han, S.H. Li, M.C. Chaturvedi
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Temperature Dependent Elastic Constants of Directionally Solidified Superalloys

Journal of Engineering Materials and Technology, 2012
Directionally solidified superalloys have been extensively used as turbine blade materials to improve creep-rupture and thermal fatigue performances. Turbine blades are subjected to fluctuant temperature changes. Precise knowledge of material behavior at various temperatures is essential in design and service life evaluation of turbine blades.
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Creep failure analysis of directionally solidified CM247LC superalloy

Materials Testing
Abstract This study investigates the behavior of an in-house cast directionally solidified nickel-based superalloy (i.e. CM247LC grade alloy) at low and high temperatures (760 and 982 °C, respectively). For this purpose, creep and tensile tests were conducted on the alloy after the heat treatment consisted of solutionizing and double ...
Müge Akdemir, Hüseyin Aydın, Havva Kazdal Zeytin, Hüseyin Çimenoğlu   +3 more
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Dendrite spacing in a directionally solidified superalloy

Metallurgical Transactions A, 1981
S. N. Tewari, A. M. Sriramamurthy
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