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oai:www.ideals.illinois.edu:2142/22144 2023-07-10 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Sehitoglu, Huseyin Kadioglu, Yavuz 2011-05-07T13:30:24Z 2011-05-07T13:30:24Z 10000-01-01 1992 Thermo-mechanical fatigue (TMF) and isothermal fatigue (IF) behavior of coated and uncoated Mar-M247 and, uncoated Mar-M246 was studied. The Mar-M247 was coated with Alpak-S1. The coating consists of a manganese and Aluminium powder slurry that is applied by painting, dipping, or spraying with an air brush. Thermo-mechanical experiments for coated Mar-M247 were conducted under T$\sb{\rm min}$ = 500$\sp\circ$C and T$\sb{\rm max}$ = 871$\sp\circ$C conditions. Both out-of-phase and in-phase strain-temperature phasing conditions were considered. Isothermal experiments were conducted at 500$\sp\circ$C and 871$\sp\circ$C. Comparison with the uncoated Mar-M247 showed that fatigue lives of coated material could be lower than the uncoated material and the difference was as much as four folds in some cases. For uncoated Mar-M247, only thermo-mechanical out-of-phase experiments were conducted. The temperature limit considered was T$\sb{\rm min}$ = 500$\sp\circ$C and T$\sb{\rm max}$ = 1038$\sp\circ$C. SEM, Microprobe and Auger spectroscopy were used to gain insight into oxidation effects at high temperature. An experimental program for Mar-M246 was also carried out. Due to the coarse grained structure, the stress-strain response indicates variation from specimen to specimen in some cases. The effect of this variation on life does not appear significant, except at smaller strain ranges. A numerical method is also developed to estimate the stress field due to a surface inhomogeneity in an elastic half space. The technique is based on Eshelby's equivalent inclusion method. The results were used in developing a life prediction methodology for the coated superalloys. Made available in DSpace on 2011-05-07T13:30:24Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9215833.pdf: 4741420 bytes, checksum: 75a939caecaaa191d1e0e02cd1a9308c (MD5) Previous issue date: 1992 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:55:37Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:25:56-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9215833 (UMI)AAI9215833 http://hdl.handle.net/2142/22144 eng Copyright 1992 Kadioglu, Yavuz Engineering, Mechanical Engineering, Materials Science Modelling of thermo-mechanical fatigue behavior in superalloys text Mechanical Science and Engineering Mechanical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.