Accession Number : AD0474511

Title :   EFFECT OF LONG-TIME EXPOSURE AT 550 F ON THE MECHANICAL PROPERTIES OF AM350 SHEET MATERIAL.

Descriptive Note : Final rept. Jun 61-30 Oct 65,

Corporate Author : MICHIGAN UNIV ANN ARBOR DEPT OF CHEMICAL AND METALLURGICAL ENGINEERING

Personal Author(s) : Cullen, T. M. ; Freeman, J. W.

Report Date : NOV 1965

Pagination or Media Count : 30

Abstract : As part of a program to evaluate the applicability of different alloys as skin materials for the supersonic transport, research has been carried out on the influence of long-time exposure on the mechanical properties of AM350 sheet material. This alloy was exposed at 550 F for times up to 30,000 hours both with and without stress in two different conditions of prior treatment. No significant creep was accumulated in the alloy during the prolonged exposure under a stress of 67,000 psi. In addition, the microstructure of the alloy in each of its conditions of prior treatment was unchanged by the prolonged exposure. No significant difference was noted in the mechanical properties of the AM350 alloy after 30,000 hours of exposure at 550 F compared to the original properties of the sheet material. The lack of any measureable influence on long-time stressed exposure on the mechanical properties of this alloy indicates that it would perform satisfactorily in the SST provided that all of its properties are at a sufficiently high starting level. (Author)

Descriptors :   (*STAINLESS STEEL, MECHANICAL PROPERTIES), TENSILE PROPERTIES, MICROSTRUCTURE, HARDNESS, ACCELERATED TESTING, ELASTIC PROPERTIES, DUCTILITY, SHEETS.

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE