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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
    Electronic Resource
    Electronic Resource
    Intergranular Strain and Phase Transformation in a Cobalt-Based Superalloy (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 524-525 (Sept. 2006), p. 893-898 
    Details
    ISSN: 1662-9752
    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: ULTIMET® alloy, a cobalt-based superalloy with good corrosion and wear resistantproperties, exhibits a deformation-induced phase transformation from the face-centered-cubic(FCC) phase to the hexagonal-close-packed (HCP) phase. The HCP phase formation duringmonotonic tensile loading was investigated using in-situ neutron diffraction. The HCP phase is firstobserved at a stress level of 810 MPa, which is well beyond macroscopic yielding. Strain analysisis performed on the FCC phase diffraction data in order to relate the lattice-strain development withthe evolution of the new HCP phase. A method of calculating the effective macroscopic stressassociated with the measured lattice strains is presented here. The effective stress can then becompared to the applied macroscopic stress in order to draw conclusions about the load-partitioningbehavior of the material as a new phase develops
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.893.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A Review of Haynes〈sup〉®〈/sup〉 230〈sup〉® 〈/sup〉and 617 Alloys for High Temperature Gas Cooled Reactors (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 595-598 (Sept. 2008), p. 511-517 
    Details
    ISSN: 1662-9752
    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: HAYNES® 230® and 617 alloys are competing for use on Generation IV, high temperaturegas cooled reactor components because of good high temperature creep strength in the temperaturerange between 760°C and 982°C and resistance to oxidation in the gas cooled reactor environment.A review of the metallurgy affecting the properties in each alloy will be discussed. Grain size andcarbide precipitation developed during fabrication effect short term and long term ductility, fatigue,and creep. For example, 230 alloy has a finer grained structure which promotes fatigue strengthwith a slight sacrifice in creep strength. The 617 alloy has a coarser grain structure which providesslightly higher creep resistance while sacrificing some fatigue strength. Thermal aging alsointroduces gamma prime precipitation to the 617 alloy as well as grain boundary carbides, and this,in addition to grain boundary oxidation, reduces the low cycle fatigue strength of 617 alloycompared to 230 alloy. Independent studies have shown that 230 alloy possesses higher resistanceto thermal fatigue than 617 alloy. However, welds of both base metals with similar weldcomposition have about the same thermal fatigue life. Cooling rates from solution annealingtemperatures during processing effect the ductility and creep strength of these alloys with thehighest cooling rates preferred for retention of ductility and creep strength. The reason; slowcooling rates promote carbide precipitation in the grain boundaries which reduces ductility andcreep strength
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.595-598.511.pdf
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    Paper (German National Licenses)
    Fulltext
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