Accession Number : AD0693562

Title :   GRAIN GROWTH IN AUSTENITIC STAINLESS STEEL.

Descriptive Note : Rept. for Jan-Jun 68,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Stanley,J. K. ; Perrotta,A. J.

Report Date : 15 JUL 1969

Pagination or Media Count : 28

Abstract : Despite the extensive use of Type 347 stainless steel tubing for regeneratively cooled thrust chambers, very little is known about its grain growth characteristics. Lacking, also, is information on the other 18 Cr 8 Ni austenitic steels. Therefore, grain growth curves for AISI Types 304, 316, and 321 were obtained and compared. Grain growth characteristics were established at temperatures between 1900 and 2300F, for periods of 5, 15, and 60 min. Rapid heating and cooling were used with all samples to simulate, to some degree, conditions experienced in thrust chambers. Some similarity in grain growth behavior of Types 321 and 347 was noted; rapid grain growth was found to occur at about 2000F. Some grain growth similarity also exists between Types 304 and 316; grain growth was rapid above 1900F. Where grain growth occurred, the greatest changes were during the first 15 min at temperature. Where micrographs are available in a failure analysis, these data can be used to make estimates of the temperatures to which the austenitic steel tubes were heated. (Author)

Descriptors :   (*STAINLESS STEEL, CRYSTAL GROWTH), AUSTENITE, CHROMIUM ALLOYS, NICKEL ALLOYS, GRAIN SIZE

Subject Categories : Metallurgy and Metallography
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE