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  • 1
    Electronic Resource
    Electronic Resource
    Elevated-Temperature Creep-Fatigue Crack-Growth Behavior of HAYNES〈sup〉®〈/sup〉188 Superalloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 287-290 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The creep-fatigue crack-growth behavior of HAYNES® 188, a cobalt-based superalloy, wasstudied at the temperatures of 649, 816, and 927 oC under isothermal conditions. Various hold timesat the maximum load were introduced to study the effects of hold time and temperature on thecrack-growth behavior. The experiments were conducted under constant stress-intensity-factorrangecontrol modes. Crack lengths were measured by a direct current potential method. Theintroduction of hold times led to an increase in the cyclic crack-growth rate. As the temperatureincreases, the time-dependent crack-growth behavior was dominant
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.287.pdf
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    Paper (German National Licenses)
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  • 2
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    Effects of High Temperature Exposures on Fatigue Life of Disk Superalloys (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The effects on fatigue life of high temperature exposures simulating service conditions were considered for two disk superalloys. Powder metallurgy processed, supersolvus heat treated Udimet (trademark) 720 and ME3 fatigue specimens were exposed in air at temperatures of 650 to 704 C, for times of 100 h to over 1000 h. They were then tested using conventional fatigue tests at 650 and 704 C, to determine the effects of exposure on fatigue resistance. Cyclic dwell verification tests were also performed to contrast the effects of intermixed exposures and fatigue cycles. The prior exposures reduced life by up to 70% and increased the scatter in life, compared to unexposed levels. Cyclic dwell tests reduced lives even more. Fractographic evaluations indicated the failure mode was shifted by the exposures and cyclic dwells from predominantly internal to often surface crack initiations. The increased scatter in life was related to the competition between internal crack initiations at inclusions or large grains producing longer lives, and surface crack initiations at an environmentally affected surface layer producing shorter lives.
    Keywords: Metals and Metallic Materials
    Type: International Symposium on Superalloys; Sep 19, 2004 - Sep 23, 2004; Seven Springs, PA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Effects of High-Temperature Exposures on the Fatigue Life of Superalloy Udimet(Registered Trademark) 720 (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The purpose of this study was to examine the effects of extended exposures on the near-surface fatigue resistance of a disk superalloy. Powder metallurgy processed, supersolvus heat-treated Udimet 720 (U720) fatigue specimens were exposed in air at temperatures from 650 to 705 C for 100 hr to over 1000 hr. They were then tested using conventional fatigue tests at 650 C to determine the effects of exposure on fatigue resistance. The exposures reduced life by up to 70% and increased the scatter in life, compared to unexposed levels. Fractographic evaluations indicated the failure mode was shifted by the exposures from internal to surface crack initiations. The increased scatter in life was related to the competition between internal crack initiations at inclusions or large grains producing longer lives, and surface crack initiations at an environmentally affected surface layer producing shorter lives.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM-2002-211570 , NAS 1.15:211570 , E-13354 , 131st Annual Meeting and Exhibition; Feb 17, 2002 - Feb 21, 2002; Seattle, WA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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