A STUDY OF SUBSTRUCTURE AND CREEP RESISTANCE USING NICKEL, WITH PRELIMINARY DATA FOR NIOBIUM
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1961
- Accession Number
- AD0271478
Entities
People
- A. Phillip Coldren
- James W. Freeman
Organizations
- University of Michigan