.... Creep testing was performed using 240 MPa and a temperature of 850 °C. Microstructural differences and hence differences in mechanical properties are found in extracted and witness samples. Turbomachinery Technical Conference & Exposition, Hynes Convention Center, June 26–30, 2023. Turbo Expo...

...–30, 2023. Turbo Expo 2023. e-mail:  frank.biesinger@ge.com e-mail:  huascar.lorini@ge.com e-mail:  ritesh.shah@ge.com 25 09 2023 02 10 2023 08 02 2024 creep FE-simulations HCF LCF lifetime prediction turbines flexible operation Conventional...

... for these fracture curves were compared, leading to the assumption of constant monotonic fracture energy at operating temperatures below the creep activation temperature. Monotonic fracture tests were displacement controlled at a rate of 0.001in./s to failure, where failure was defined as the point at which...

... of the valve box to around 350 ° C . The stress also increased at the top of the seat. Creep analysis revealed that the intactness of the HTIV is kept after the assumed operation cycles of the plant life as well as at the depressurization accident. alloys creep fatigue fission reactor safety gas cooled...

...Bruce A. Pint; Michael P. Brady; Yukinori Yamamoto; Michael L. Santella; Philip J. Maziasz; Wendy J. Matthews A corrosion- and creep-resistant austenitic stainless steel has been developed for advanced recuperator applications. By optimizing the Al and Cr contents, the alloy is fully austenitic...

... outstanding creep-resistance at 600 – 900 ° C , which compares well with Ni-based superalloys such as alloys X, 625, 617, and 230. CF8C-Plus also has very good fatigue and thermal fatigue resistance. It is used in the as-cast condition, with no additional heat-treatments. While commercial success for CF8C...

...Ventzislav G. Karaivanov; William S. Slaughter; Sean Siw; Minking K. Chyu; Mary Anne Alvin Turbine airfoils have complex geometries and, during service operation, are subjected to complex loadings. In most publications, results are typically reported for either uniaxial, isothermal tensile creep...

...Girish M. Shejale Gas turbine components such as nozzle segments, buckets, transition pieces, and combustion liners experience damages such as creep, fatigue, high temperature oxidation, and corrosion. The reliability, availability, and efficiency of high temperature gas turbine parts are based...

... resulting from oxidation, creep, and thermal fatigue, are driven by hot spot peak temperature and the associated thermal gradient. Standard material characterization tests, such as creep, oxidation, and low cycle fatigue are indicators of a material’s potential performance but they neither fully represent...

... stiffness and damping coefficients that agree well with the experimentally estimated parameters. Note, however, that the metal mesh ring, after continuous operation and various dismantling and re-assembly processes, showed significant creep or sag that resulted in a gradual decrease in its structural force...

.... , Stinner , C. P. , Lipschutz , M. , and Montague , J. P. , 2004 , “ The Use and Performance of Oxidation and Creep-Resistant Stainless Steels in an Exhaust Gas Primary Surface Recuperator Application ,” ASME Paper No. GT2004-53917. Lara-Curzio , E. , More , K. L. , Maziasz , P...

...T.-L. Sham; Robert I. Jetter; Daniel R. Eno Some recent studies of material response have identified an issue that crosses over and blurs the boundary between ASME Boiler and Pressure Vessel Code Section III Subsection NB and Subsection NH. For very long design lives, the effects of creep show up...

...M. Aghaie-Khafri; S. Farahany Creep degradation of an IN738C superalloy after long-term thermal exposure in an atmospheric furnace was investigated by means of accelerated creep tests. Experimental observation showed that the minimum creep rate increased by increasing the exposure time or exposure...

...Takashi Ogata High-temperature components in thermal power plants are subjected to creep-fatigue loading where creep cavities initiate and grow on grain boundaries. Development of life assessment methods of high-temperature components in gas turbine for maintenance and operating cost reduction...

...Xiaojun Yan; Jingxu Nie A new experimental method, in which a full scale directionally solidified (DS) alloy turbine blade is loaded by a special design rig employing friction force and heated by eddy current induction, is proposed to conduct creep-fatigue life tests in this investigation...

...Stephen Schoonbaert; Xiao Huang; Scott Yandt; Peter Au Co-base superalloys are commonly used for vanes and parts of the combustion chamber in gas turbine engines. The Co-base superalloys are primarily solid solution strengthened and have good resistance to hot corrosion, creep, and thermal fatigue...

... of the profile tubes is determined. From transient thermal calculations successive 3D temperature fields are obtained which enable the determination of creep life and LCF life of the part. Finally, vibration analysis is performed in order to estimate the vibration stress of the profile tubes during engine...

... element analyses were done to calculate the temperature and stress/strain distribution in the liner during several operating conditions. A method was developed to analyze a complete flight with limited computational effort. Finally, the creep and fatigue life for a measured flight were calculated...

...W. J. Evans; J. P. Jones; M. R. Bache The high-temperature fatigue response of titanium and nickel alloys destined for high-performance gas turbine applications is considered with particular emphasis given to the role of creep and environmental damage during crack growth. In an attempt to partition...

... and creep resistance. Siemens-Westinghouse has carried out long-term aging studies on COI’s Nextel 720 alumino-silicate system. Samples were exposed up to 1000 h at temperatures ranging from 1000°C to 1200°C (Fig. 1 ) in air 10 . The data indicates that the properties of the Nextel 720 composite...