...L. G. Zhao Finite element analyses of oxygen diffusion at the grain level have been carried out for a polycrystalline nickel-based superalloy, aiming to quantify the oxidation damage under surface oxidation conditions at high temperature. Grain microstructures were considered explicitly...

...Z. J. Moore; R. W. Neu Fatigue life modeling of anisotropic materials such as directionally-solidified (DS) and single-crystal Ni-base superalloys is often complicated by the presence of notches coupled with dwells at elevated temperatures. This paper focuses on an approach for predicting low cycle...

... blades with the absence of such data. This paper describes innovative methods used to predict high-temperature fatigue of IN738LC, a dual-phase Ni-base superalloy. Three sets of experimental data at different temperatures are used to evaluate and examine the validity of extrapolation methods...

...Calvin M. Stewart; Ali P. Gordon; Erik A. Hogan; Ashok Saxena Creep deformation and rupture experiments are conducted on samples of the Ni-base superalloy directionally solidified GTD-111 tested at temperatures between 649 ° C and 982 ° C and two orientations (longitudinally and transversely...

... 2011 deformation geometry hardening plates (structures) superalloys viscoplasticity Continuum damage models rely on the assumption that the unknown response functions for the real damaged material may be established from that for an undamaged fictitious material. The response...

...S. Chiozzi; V. Dattoma; F. Panella This work concerns single crystal Ni-based superalloy welded through the capacitor discharge welding (CDW) process. The static and fatigue behavior of CMSX-4 type single crystal alloy has been analyzed, performing mechanical tests on square specimens in order...

... of an Austenitic Superalloy—Temperature and Strain Rate Effects ,” Mater. Sci. Eng., A 0921-5093 , 474 ( 1–2 ), pp. 363 – 370 . 10.1016/j.msea.2007.05.056 Roy , A. K. , Koripelli , R. S. , and Pal , J. , 2008 , “ Tensile Deformation of a Nickel-Base Superalloy for Application in Hydrogen...

... superalloy IN100. The model incorporates the dominant creep deformation mechanism, coupling between the creep and plasticity models, and effects of prior plastic strain. The initial room temperature residual stress and plastic strain profiles provide the initial conditions for relaxation predictions using...

...Duyi Ye; Jinyang Zheng In this paper, both the dissipation of the plastic-strain energy and the exhaustion of the static toughness during high-temperature low-cycle fatigue of GH4145/SQ superalloy were investigated. Together with the analysis of the microscopic aspects of the material, an energy...

... on new insights on single crystal nickel-base superalloys gained with this approach. A portable ultrasonic fatigue instrument has been designed that can be installed at a high-brilliance X-ray beamline. With a load line and fatigue specimen configuration, this instrument produces stable fatigue crack...

...Shin-ichi Komazaki; Tetsuo Shoji; Kazumune Takamura In order to develop a procedure for evaluating the degradation of impact toughness in directionally solidified Ni-base superalloy CM247LC, which is commonly used for advanced gas turbine blades, the change in small punch (SP) fracture energy due...

... of anisotropic material behavior and the effect of changes in grain orientation as the crack grows. The effect of local crystallography was studied in multicrystalline Compact-Tension (CT) specimens of pure nickel and a cast Ni-based superalloy. Orientation Imaging Microscopy (OIM) was used to map...

...G. Bande; J. A. Nemes A new approach used for single crystal (SC) materials analysis is described. Its principle is based on the extension of predictive models for isotropic material behavior to anisotropic materials such as SC nickel base superalloys. A viscoplastic model describes the material...

...M. M. Shenoy; A. P. Gordon; D. L. McDowell; R. W. Neu 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...

...Rong Liu; Matthew X. Yao; Xijia Wu Two cobalt-based superalloys containing 1.6% and 2% carbon respectively were studied, with the emphasis on the influence of the carbon content on their microstructures, wear resistance, and mechanical properties. Phase formation and transformation...

... to the inelastic response of salt is given in companion papers 8 9 . The effect of temperature on material modeling, not addressed here, has been discussed by Julien 10 . IN738 LC is an oxidation-resistant superalloy developed for gas turbine applications...

... steel claddings iron alloys chromium alloys nickel alloys superalloys molybdenum alloys finite element analysis Recovery boilers are used by paper mills to burn “black liquor” for the recovery of pulping chemicals and for generation of steam. The chemicals and steam are then used...

...D. J. Arrell; J. Bressers; J. Timm Thermo-mechanical fatigue of nickel-base superalloys has been carried out for more than twenty years, but a unified standard for such tests has yet to be fully formulated. As a consequence of this, even excluding differences in testing procedure from laboratory...

... nickel alloys chromium alloys cobalt alloys superalloys fatigue slip creep fracture voids (solid) scanning electron microscopy modelling With increasing use of long-term operated gas turbine power plants, it becomes important to improve the accuracy of creep-fatigue life prediction...