HYDROGEN IN ALPHA IRON DETERMINED VIA ULTRASONIC SNOEK EFFECT AND RELATED MEASUREMENTS.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1968
- Accession Number
- AD0665011
Entities
People
- Arthur E. Lord Jr.
- Bruce B. Chick
- George P. Anderson
Organizations
- Brown University