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Weld Cracking in Directionally Solidified Inconel 738 Superalloy
Canadian Metallurgical Quarterly, 2007AbstractThe microstructure of a laser beam welded directionally solidified Inconel 738 (DS IN738) superalloy was studied. The alloy was welded along the longitudinal (the solidification direction) and the transverse (perpendicular to solidification) direction in two pre-weld heat treated conditions. The material suffered intergranular microfissuring in
R.K. Sidhu, O.A. Ojo, M.C. Chaturvedi
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Directionally solidified Soviet superalloy, ZHS6-K
Journal of Materials Science, 1981Directional 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, 2000AbstractA 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, 1999Cobalt-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 +3 more
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Thermomechanical Fatigue Behavior of a Directionally Solidified Ni-Base Superalloy
Journal of Engineering Materials and Technology, 2005A 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 +3 more
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A Cyclic Life Prediction Approach for Directionally Solidified Nickel Superalloys
Journal of Engineering for Gas Turbines and Power, 2009Abstract 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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Microstructural stability of the directionally solidified γ′-base superalloy IC6
Materials Science and Engineering: A, 1993Abstract The microstructural stability of an NiAlMo 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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Creep failure analysis of directionally solidified CM247LC superalloy
Materials TestingAbstract 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 +3 more
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Temperature Dependent Elastic Constants of Directionally Solidified Superalloys
Journal of Engineering Materials and Technology, 2012Directionally 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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An Investigation of Dendritic Segregation in Directionally Solidified CMSX-4 Superalloy
2015Dendritic segregation of directionally solidified columnar and single crystal CMSX-4® superalloy in as-cast and heat-treated condition was investigated. The partition coefficients of alloying elements derived from EDS measurements for various secondary dendrite arm spacings (SDAS) exhibited strong segregation in the dendrite cores (Re, W) or in the ...
Gheorghe Matache +3 more
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