Accession Number:

AD0416457

Title:

CHARACTERIZING FRACTURES BY ELECTRON FRACTOGRAPHY, PART XII, ILLUSTRATED GLOSSARY, SECTION 1: QUASI-CLEAVAGE,

Descriptive Note:

Memo. rept.

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Report Date:

1963-06-01

Pagination or Media Count:

20.0

Abstract:

This report is one of a series intended to illustrate and explain the terminology used in describing the features in high magnification fractographs. Quasi-cleavage is one of several fracture modes possible in the mechanical rupturing of quenched and tempered martensitic steels. The high magnification surface topography in this fracture mode resembles true cleavage in that the fracture facets are relatively flat with markings which often, though weakly, resemble river patterns in true crystallographic cleavage. In addition to the steps which produce these markings, there are also tongues cleavage on secondary planes which strongly resemble true cleavage. But in addition there are, in quasi-cleavage, ridges produced by plastic deformation and rupture of thin webs of metal between two growing submerged crack fronts these markings do not resemble true cleavage. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE