(Microstructural dependence of the cavitation damage function in the FCC materials: Annual report, 1990--1991)

Technical Report · Tue Jan 01 00:00:00 EST 1991

DOI:https://doi.org/10.2172/6198025· OSTI ID:6198025

The interface damage function (IDF) defines an area fraction of damage on crystallite interfaces. This function, which is material and condition dependent, sustains a complete geometrical description of grain boundaries and identifies those types of interfaces which are preferentially damaged. Included in the IDF is functional dependence, not only upon lattice orientations or misorientations, but also upon grain boundary normal; this dependence has been largely neglected in other studies examining damage inhomogeneity of polycrystals. The experimental method used in describing the damaged microstructures included random sectioning of the damaged specimen, and the manual or semi-automatic construction of grain maps describing the observed microstructure. The grain maps for the initial IDF determination were constructed from scanning electron micrographs. Several of these micrographs were joined together and the grain boundaries were traced. There were manually fed back into the computer using a digitizing pad with each grain boundary intersection defined by an (x,y) pair of coordinates. Using algorithms written as a part of this work, the computer then reconstructs the grain map from this series of points. Manual correction of the computer generated maps was required to obtain an acceptable digitized reproduction of the observed microstructure.

• Research Organization: Yale Univ., New Haven, CT (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-88ER45355
• OSTI ID: 6198025
• Report Number(s): DOE/ER/45355-T1; ON: DE92003052
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
GRAIN BOUNDARIES
DIFFUSION
CAVITATION
CREEP
FCC LATTICES
MICROSTRUCTURE
NUCLEATION
PROGRESS REPORT
SCANNING ELECTRON MICROSCOPY
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DOCUMENT TYPES
ELECTRON MICROSCOPY
MECHANICAL PROPERTIES
MICROSCOPY
360102* - Metals & Alloys- Structure & Phase Studies
360103 - Metals & Alloys- Mechanical Properties