Precipitate Size and Distribution Effects on Fatigue Crack Initiation and Propagation in a High Strength Steel PDF Download
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Author: Charles M. Gilmore Publisher: ISBN: Category : Metals Languages : en Pages : 12
Book Description
It has been observed that high yield strength metals do not necessarily exhibit an equally high fatigue strength. Thus the dependence of fatigue failure on the precipitate size and distribution is investigated. Also, it is proposed that the permanent axial strain resulting from cyclic torsion is indicative of the metal response to cyclic loading. Microscopic observation of the failed specimens showed that failure at plus or minus 0.005 in/in twist strain occurred by the propagation of a single shear macrocrack linking with shear microcracks. The initiation of the shear microcracks was found to depend upon the precipitate size and distribution. With fine particles localized deformation bands became microcracks, but with coarser particles crack initiation began at the particle-matrix interface. (Author Modified Abstract).
Author: Charles M. Gilmore Publisher: ISBN: Category : Metals Languages : en Pages : 12
Book Description
It has been observed that high yield strength metals do not necessarily exhibit an equally high fatigue strength. Thus the dependence of fatigue failure on the precipitate size and distribution is investigated. Also, it is proposed that the permanent axial strain resulting from cyclic torsion is indicative of the metal response to cyclic loading. Microscopic observation of the failed specimens showed that failure at plus or minus 0.005 in/in twist strain occurred by the propagation of a single shear macrocrack linking with shear microcracks. The initiation of the shear microcracks was found to depend upon the precipitate size and distribution. With fine particles localized deformation bands became microcracks, but with coarser particles crack initiation began at the particle-matrix interface. (Author Modified Abstract).
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Fatigue tests were performed on ultra-high strength steels to assess (i) the influence of strength at constant grain size, and (ii) the influence of grain size at constant strength, on threshold stress intensity and near-threshold crack propagation rates. The results constitute part of a larger program of research to characterize the microstructural influences on fatigue crack propagation at growth rates less than 10−5 mm/cycle in an attempt to provide a basis for the design of alloys resistant to low growth rate fatigue failure.
Author: Charles M. Gilmore
Author: Charles M. Gilmore
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Author: United States. National Bureau of Standards
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