Accession Number:

AD0431856

Title:

ELEVATED TEMPERATURE TESTS OF CHROMIUM - TITANIUM - SILICON COATED F48 COLUMBIUM ALLOY BOLT AND NUT,

Descriptive Note:

Corporate Author:

MCDONNELL AIRCRAFT CORP ST LOUIS MO

Personal Author(s):

Report Date:

1964-03-10

Pagination or Media Count:

8.0

Abstract:

A F-48 Columbium alloy bolt and nut was subjected to four 12 hour cycles of exposure to 2500F and cooled to room temperature. Prior to, and after each exposure the bolt and nut was weighed to .0001 grams and the weight gain determined. Following thermal cycling the bolt and nut was cross sectioned and metallographically examined, photographed, and coating thickness measured on the bolt shank and thread areas. Metallographic examination showed an equiaxed grain structure, resulting from recrystallization. Recrystallization began to replace the wrought structure, characteristic of the bolt before thermal cycling. Visual examination of the bolt and nut after the temperature exposures exhibited blemishes of chromium oxides on both bolt and nut. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE