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  • 1
    Electronic Resource
    Electronic Resource
    Damage and Crack Initiation Behavior of Duplex Stainless Steel during Cyclic Loading (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 1117-1122 
    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: Two phase metals during cyclic loading can suffer from non-uniform load or strainsharing between the phases due to elastic/plastic anisotropy. This can strongly influence the fatiguedamage and crack initiation behavior. In this study, the fatigue damage and crack initiation behaviorof an austenitic-ferritic duplex stainless steel with anneal/quenched and aged conditions has beenstudied by both experimental investigations and simulation using multi-scale material modeling. Itwas found, both experimentally and via simulations, that the material damage and crack initiationstart in the ferrite phase in the material with the anneal/quenched condition and in either the ferriteor austenite phase in the material with the aged condition, mainly in the weakest phase if thedeformation hardening is considered
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.1117.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    In Situ X-Ray Diffraction Study of Load Partitioning and Microyielding for the Super Duplex Stainless Steel SAF2507 (UNS S32750) (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 524-525 (Sept. 2006), p. 847-852 
    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: The deformation behaviour of the super duplex stainless steel SAF2507 (UNS S32750)under successive uniaxial tensile loading-unloading was investigated with respect to load sharingand inter-phase interactions. The steel consists of 58% austenite and 42% ferrite in volume. By insituX-ray diffraction experiment the evolution of phase-specific stresses with applied load wasmonitored for three successive loading-unloading cycles with the maximum total strains being0.34%, 0.75% and 1.63%, respectively. It was found that yielding occurred earlier in the austeniticphase than in the ferritic phase during the first loading cycle. In the followed loading cycles, bothphases yielded under larger but similar applied stresses. Due to a similar behavior of the phases inthe elasto-plastic regime inter-phase interactions were relatively weak. Low microstresses inducedby the plastic straining resulted in somewhat larger stresses in the ferritic phase
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.847.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    On the Development of Grain-Orientation-Dependent and Inter-Phase Stresses in a Super Duplex Stainless Steel under Uniaxial Loading (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 524-525 (Sept. 2006), p. 917-922 
    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: Microstresses due to intergranular and inter-phase interactions in an austenitic-ferriticsuper duplex steel (SAF 2507) under uniaxial compressive deformation have been studied by in-situneutron diffraction experiments. Lattice strains of several hkl planes of austenite respective ferritewere mapped as a function of sample direction at a number of load levels during loading into theplastic regime and unloading. The analysis of the experimental results has shown that duringloading both grain-orientation-dependent and inter-phase stresses were generated under plasticdeformation that was inhomogeneous at the microstructural level. Residual stresses depending onthe grain-orientation and phase have been found after unloading. The results also indicate strongerintergranular interactions among the studied hkl planes of austenite than those of ferrite
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.917.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Microstructure-Aided Analysis of Fatigue Thresholds in Duplex Stainless Steel (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 567-568 (Dec. 2007), p. 101-104 
    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: High fatigue threshold values of duplex ferritic-martensitic steels are interpreted by usinga unified model of roughness- and plasticity induced crack closure. Complex metallographical andfractographical analysis was performed in order to obtain characteristics of tortuous crack pathsproduced by crack deflection and branching mainly at austenite/ferrite interfaces. Calculated valuesof effective thresholds are in a good agreement with experimental data. The total level of extrinsictoughening (closure + shielding) induced by the duplex microstructure was determined to be asmuch as 70% of measured fatigue threshold values. This is the main reason for the high resistanceto propagation of long fatigue cracks in the near-threshold region
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.567-568.101.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Damage Behavior of Metallic Materials under Very High Cycle Fatigue (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 348-349 (Sept. 2007), p. 237-240 
    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 fatigue damage behavior of three two-phase steels in the very high cycle fatigueregime (VHCF 〉108cycles) has been studied by both fatigue testing and microstructuralinvestigation using SEM and TEM. The results show that the S-N curves can vary from a single tomulti S-N curves, and there is also a transition of fatigue crack initiation from surface defect,subsurface defect such as inclusion to subsurface non defect area or matrix depending on the steelgrades and its conditions. The surface crack initiation is caused by formation of irreversible slipbands at the free surface or around surface defect. Subsurface inclusion crack initiation is mainlycaused by strain localization (slip bands) emanating at subsurface inclusion. Crack initiation in thesubsurface non defect area occurs in the areas that are physically weak. It is also a fatigue damageprocess caused by micro cyclic plastic deformation. Formation of subsurface non defect fatiguecrack origin is a crack initiation and propagation process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.348-349.237.pdf
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