Accession Number : AD0672217

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

Corporate Author : BOEING CO RENTON WASH COMMERCIAL AIRPLANE DIV

Personal Author(s) : Begemann,S. H. A.

Report Date : 1968

Pagination or Media Count : 24

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