Delayed Failure Hydrogen Embrittlement of Zirconium: Quarterly Report Number 1, September - December 1961 Page: 1
[15] p. : ill., tables ; 28 cm.View a full description of this report.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
DELAYED FAILURE HYDROGEN EMBRITTLEMENT
OF ZIRCONIUM
I. INTRODUCTION
This is ths first Quarterly Report, covering the period
September 15 to December 14, 1961, on Contract No. AT(1 i-l)-578, Project
Agreement No. 14. This investigation is being conducted under the auspices
of the USAEC/AECL Collaborative Program.
It was recognized several years ago that sirconium absorbs
hydrogen during corrosion in superheated water and steam. Shortly after this,
the lose of impact properties after exposure to high-temperature water or
steam was attributed to the presence of sirconium hydride as a grain boundary
and/or matrix platelet phase.. In recent years, a considerable number of
investigations have been pursued for the purpose of increasing knowledge of
this phenomenon as well as finding means of eliminating this serious em-
brittlement problem. In these investigations, the impact teet was, very logi-
cally, almost exclusively employed as a method of evaluation; such an ap-
proach, however, has resulted in an almost complete neglect of perhaps an
equally or more important manifestation of hydrogen occlusion--namely, the
delayed failure phenomenon. Thus, the purpose of the present investigation
is to determine the extent to which zirconium exhibits delayed failure (static
fatigue) ar. caused by a combination of absorbed hydrogen and applied stress.
That the long-time mechanical properties of sirconium
are important design considerations cannot be disputed when one considers
that certain in-core reactor components, such as pressure tubes and structur-
al elements, should have a service lifetime of up to 20 years. Impact tests
are not able to predict long-time mechanical behavior. Moreover, current
theories for hydrogen embrittlement do not preclude the possibility of static
fatigue occurring in zirconium. While this phenomenon is usually associated
with high-strength steels and other body-centered cubic metals, delayed
failure has been observed for titanium alloys and even face-centered cubic
ASMOVII till ASCM FOUNDATION Of IlllNOII INSTITUTI OF TICHNOIOOY
- 1 -
ARF 2230-3
241 03
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Weinstein, Daniel & Holtz, F. C. Delayed Failure Hydrogen Embrittlement of Zirconium: Quarterly Report Number 1, September - December 1961, report, January 3, 1962; Chicago, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc502454/m1/3/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.