Accession Number:

AD0672217

Title:

INTERNAL FRICTION MEASUREMENTS FOR THE ANALYSIS OF HYDROGEN IN STEEL PARTS,

Descriptive Note:

Corporate Author:

BOEING CO RENTON WASH COMMERCIAL AIRPLANE DIV

Personal Author(s):

• Begemann,S. H. A.

Report Date:

1968-01-01

Pagination or Media Count:

24.0

Abstract:

Damping versus temperature curves were determined, by means of a torsion pendulum internal friction apparatus, for hydrogen charged cold drawn 4340 steel wire. A relaxation peak, identified as the Hydrogen Cold-Work Peak, was found in the curves between -90C and -70C. A plot of this relaxation peak height versus charging time shows a linear relationship over only a limited range. The low hydrogen concentration levels that can cause hydrogen embrittlement were found to be below the limits of accurate detection by internal friction methods. Author

Descriptors:

• (*HYDROGEN EMBRITTLEMENT
• ELECTROPLATING)
• (*HYDROGEN
• DIFFUSION)
• STEEL
• TORSION
• TENSILE PROPERTIES
• STRESSES
• STRAIN(MECHANICS)
• FRICTION
• VIBRATORS(ELECTRICAL)
• FREQUENCY
• DAMPING
• THERMOCOUPLES
• LOW TEMPERATURE

Subject Categories:

• Metallurgy and Metallography
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE