Accession Number : AD0639216

Title :   THE RELATIONSHIP OF NITROGEN CONTENT OF A HIGH PURITY 20-20 AUSTENITIC STAINLESS STEEL TO STRESS CORROSION.

Descriptive Note : Final rept., 1 Jul 63-31 Jul 66.

Corporate Author : VIRGINIA POLYTECHNIC INST BLACKSBURG DEPT OF METALS AND CERAMIC ENGINEERING

Personal Author(s) : Eckel,John F. ; Smith,R. E. ; Greene,A. B.

Report Date : 30 JUL 1966

Pagination or Media Count : 25

Abstract : The problem of stress corrosion cracking in austenitic stainless steels containing nitrogen has been studied, using a high purity 20 percent chromium, 20 percent nickel steel. The approach to the problem consisted of the determination of physical characteristics of the alloy as affected by nitrogen and the possibilities of nitrogen causing aging in such steels which could be associated with susceptibility to stress corrosion cracking. Specimens containing varying amounts of nitrogen were prepared and subjected to a dilatometric analysis on heating to 180 C, and the volume changes were studied, to observe solid state reactions in the alloy in this temperature range. A unique dilatometer was designed and constructed which permits the applications of constant tensile stresses over the range of temperature of interest. Specimens were tested in this instrument at various stress levels and at a constant heating rate. Internal friction measurements were also made by means of a torsional pendulum in the temperature range from ambient room temperature up to 300 C. (Author)

Descriptors :   (*STAINLESS STEEL, *STRESS CORROSION), NITROGEN, AUSTENITE, CHROMIUM ALLOYS, NICKEL ALLOYS, INTERNAL FRICTION, AGING(MATERIALS), IMPURITIES

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE