FUNDAMENTAL DEFORMATION CHARACTERISTICS OF 80 NICKEL-20 CHROMIUM ALLOY IN CREEP AT ELEVATED TEMPERATURES (I). AGING IN NICKEL-CHROMIUM ALLOYS HARDENED WITH TITANIUM AND ALUMINUM (II)
Abstract
Preliminary creep tests at 1150 deg F indicated 2 types of defo rmation patterns in an 80/20 Ni/Cr alloy; the slip bands were sharply bent and continuous across the twin boundaries in one pattern, but existed only faintly and were zigzagged in the other. Aging was investigated for air-melted, homogenized alloys containing upto 4% Al and Ti after Hsub2O-quenching from 2000 deg F. Two types of precipitate occurred after aging at 1250 deg to 1650 deg F: (1) a fine precipitate of spheroidal shape when only Al was added, and (2) an aclcular constituent precipitate when only Ti was added. Results of creep and stress-rupture tests at 1450 deg F indicated that alloys with a high Ti/Al ratio had a long rupture life and a low minimum creep rate.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1953
- Accession Number
- AD0000961
Entities
People
- Hsing-Yin Chang
- N. J. Grant
- R. Nordheim
Organizations
- Massachusetts Institute of Technology