Accession Number:

AD0263702

Title:

THE MECHANISM OF HYDROGEN EMBRITTLEMENT OBSERVED IN IRON-SILICON SINGLE CRYSTALS

Descriptive Note:

Corporate Author:

YALE UNIV NEW HAVEN CT HAMMOND LAB

Personal Author(s):

Report Date:

1961-09-01

Pagination or Media Count:

1.0

Abstract:

The technique of decorating dislocations was employed to investigate plastic deformation and fracture resulting from precipitation of H in Fe3 Si single crystals. It is shown that cracks are produced on 100 planes inside crystals quenched from H atmosphere at elevated temperatures or cathodically charged with H at room temperature. Plastic deformation in the vicinity of cracks, observed as arrays of decorated dislocations, is in conformity with previously calculated stress distributions about a crack containing an internal pressure. The fracture characteristics of crystals containing internal cracks were evaluated at 25 and -196 C and the results are related to the mechanism of hydrogen embrittlement. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE