Accession Number : AD0670093

Title :   STABILITY AND STRENGTHENING OF NICKEL BASE ALLOYS UNDER EXPOSURE TO THE EFFECT OF MICRO CAVITATION (STOIKOST I UPROCHENIE SPLANOV NA NIKELEVOI OSNOVE PRI MIKROUDARNOM VOZDEISTVII),

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Veksler,Yu. G. ; Litvinov,V. S. ; Mints,R. I.

Report Date : 03 JUL 1967

Pagination or Media Count : 12

Abstract : The industrial alloys EI437 and EI867 (both of which are hardening nickel base alloys) were subjected to microcavitation in an impact-erosion apparatus and subsequently tested for surface hardness and weight loss. The aging characteristics of the alloys before and after exposure are given. Surface hardnesses were given as a function of testing time for different aging conditions--as-quenched and aged for 8, 25, and 50 hrs. In all cases, the plastic deformation induced by microcavitation resulted in strain hardening; maximum hardness was achieved after 3 to 4 hrs of testing. The alloy EI867 achieved the highest hardness for all relative conditions and the highest rate of strain hardening (55 to 65%) in the as-quenched condition. Sample destruction set in after about 5 to 7 hrs of testing and after the weight losses became considerable (16 to 18 hrs). Surface pitting and scaling were observed in the initial stages of exposure and the amount increased with time. Slip markings were widely scattered for microcavitation deformation when compared with the uniform slip traces observed in compression. The general kinetics and characteristics of microcavitation damage were very similar to Fe-Ni and Cr-Ni alloys. (Author)

Descriptors :   (*NICKEL ALLOYS, CAVITATION), SURFACE PROPERTIES, HARDNESS, GRAIN STRUCTURES(METALLURGY), AGING(MATERIALS), STRAIN HARDENING, IMPACT TESTS, DEFORMATION, IRON ALLOYS, CHROMIUM ALLOYS, STABILITY, COMPRESSIVE PROPERTIES, CREEP, MECHANICAL PROPERTIES, THERMAL PROPERTIES, LOADS(FORCES), USSR

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE