Accession Number:

AD0271478

Title:

A STUDY OF SUBSTRUCTURE AND CREEP RESISTANCE USING NICKEL, WITH PRELIMINARY DATA FOR NIOBIUM

Descriptive Note:

Corporate Author:

MICHIGAN UNIV ANN ARBOR OFFICE OF RESEARCH ADMINISTRATION

Personal Author(s):

Report Date:

1961-11-01

Pagination or Media Count:

1.0

Abstract:

A correlation obtained between instantaneous creep rate and a quantitative measure of the substructure density at the same time during primary creep of Ni at 1550 F and 3360 psi indicated that the development of substructure was responsible for primary creep. The correlation held for substructures developed at higher stress before testing at 3360 psi. These test conditions were used because substructures were developed which could be clearly delineated by etch pitting. Attempts to correlate substructures with varied creep-rupture properties at 1100 F from hot rolling failed, due to lack of sufficient polygonization for delineation and to interference with the decorator effect of precipitation. Extremely limited data for Nb indicated that creep-rupture properties were influenced by rolling conditions even though there was very little strain hardening in this material. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE