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Book Title: DTIC AD0603698: THE TENSILE DUCTILITY TRANSITION IN
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Book Category: STRESSES
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Language: english
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Post Date: 2025-04-15 17:33:36
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PDF Size: 4.5 MB
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Book Pages: 92
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DTIC AD0603698: THE TENSILE DUCTILITY TRANSITION IN
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Description of the Book:
An investigation was carried out to determine the nature of the tensile ductility transition in recrystallized molybdenum strip of three interstitialal contents. For a fine grain size, the tensile ductility transition temperature (T sub d) and the brittleness transition temperature (T sub b) were found to approximately coincide; whereas with increase in grain size T sub d is raised and T sub b is lowered. The occurrence of a minimum in the fracture stress (sigma sub F) at T sub d appears to be associated with the temperature dependence of the necking stress (Sigma sub n). Prestraining above T sub d, was found to result in as much as a 20% increase in (sigma sub F) as determined at temperature below T sub d. In general, the mode of fracture initiation was found to be intergranular at T sub d or below and cleavage above T sub d.
For a test temperature above as well as below T sub d, crack initiation appears to be the controlling step in fracture. Considering (sigma sub F) as a flow stress corresponding to the fracture strain (epsilon sub F), the variation of (sigma sub F) with temperature above T sub d was predicted within about 15%. Based on a modification of the Cottrell relation for crack initiation, the increase in (sigma sub F) above T sub d is associated with a decrease in both the flow locking parameter (k sub f) and the effective grain size
- Creator/s: Defense Technical Information Center
- Date: 7/1/1964
- Year: 1964
- Book Topics/Themes: DTIC Archive, , MANLABS INC CAMBRIDGE MA, *FRACTURE(MECHANICS), STRESSES, TENSILE PROPERTIES, MOLYBDENUM, BRITTLENESS, MATHEMATICAL ANALYSIS, CREEP, GRAIN STRUCTURES(METALLURGY), METALLOGRAPHY, RECRYSTALLIZATION, DUCTILITY, SHEETS, TRANSITION TEMPERATURE, FRACTOGRAPHY, STRAIN(MECHANICS), IMPURITIES
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