Accession Number : AD0665011

Title :   HYDROGEN IN ALPHA IRON DETERMINED VIA ULTRASONIC SNOEK EFFECT AND RELATED MEASUREMENTS.

Descriptive Note : Final technical rept. 1 Jan-31 Dec 67,

Corporate Author : BROWN UNIV PROVIDENCE R I METALS RESEARCH LAB

Personal Author(s) : Lord,Arthur E. , Jr. ; Chick,Bruce B. ; Anderson,George P.

Report Date : JAN 1968

Pagination or Media Count : 41

Abstract : Snoek peak ultrasonic attenuation studies have given a lower limit for the relaxation strength of hydrogen atoms in solid solution in alpha-iron. The diffusion coefficient of hydrogen at 120K was also determined. A technique has been developed whereby small changes in velocity (delta v/v - .00001) can be reliably followed for a few hours while charging a steel rod with hydrogen at 50C. The lack of a Snoek effect velocity change for our particular experiments, indicates that less than 0.60 ppm (by wgt.) of hydrogen is in solid solution. Our experimental results pertain to a 3/16-in. diam. 1018 steel rod sitting in a 4% H2SO4 bath (with CS2 poison) at 50C, with no polarizing current, for two hours. This amount of hydrogen is well below that total amount (present in the specimen) needed to produce embrittlement. (Author)

Descriptors :   (*IRON, HYDROGEN EMBRITTLEMENT), (*HYDROGEN EMBRITTLEMENT, QUANTITATIVE ANALYSIS), ULTRASONIC RADIATION, FREQUENCY, DAMPING, ATTENUATION, TEMPERATURE, DIFFUSION, VELOCITY, NONDESTRUCTIVE TESTING, STRESSES

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE