Accession Number : AD0000961


Title :   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)


Descriptive Note : Periodic status rept. no. 2, Nov 52-Feb 53


Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE


Personal Author(s) : CHANG, H C ; NORDHEIM, R ; GRANT, N J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/000961.pdf


Report Date : Feb 1953


Pagination or Media Count : 10


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.


Descriptors :   *STRESSES , RATIOS , SHAPE , RATES , SPHERES , ALLOYS , RUPTURE , BOUNDARIES , CREEP , PATTERNS , LONG LIFE , HOMOGENEITY , CREEP TESTS , PRECIPITATES


Subject Categories : Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE