High Strength Steel Weldment Reliability
Abstract
The development of methods to control the diffusible hydrogen content during high strength steel welding was performed. The perfection of the use of irreversible weld metal hydrogen traps was demonstrated. Efforts have effectively alleviated the available diffusible hydrogen, and thus the susceptibility of hydrogen assisted cracking, by the use of ferro yttrium additions to the welding consumable. The range of welding parameter for the most effective use of yttrium as a hydrogen getter was determined. The investigation of the influence of retained austenite on cracking susceptibility was also investigated. Issues regarding the amount of acceptable retained austenite and its tendency to release hydrogen upon changes of service temperature and stress were evaluated. The development of an advanced measuring apparatus for diffusible hydrogen content based on electronic, optical1 and magnetic property measurements was investigated. The effort is searching for a rapid and accurate determination for both diffusible hydrogen content and distribution. This investigation used the instrumentation acquired during the DURIP grant program. Optoelectronic property measurements of color shifts in WO3, which was attached to the steel in the form of a thin film detector, have successfully measured the diffusible hydrogen content of higher strength steel hydrogen contents. Preliminary results have also illustrated that both magnetic property and thermo electric (Seebeck) coefficient measurements can also be used to assess hydrogen issues in steel. The Seebeck coefficient appears to offer the most convenient and rapid determinations of diffusible hydrogen content.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 2001
- Accession Number
- ADA398550
Entities
People
- D. L. Olson
Organizations
- Colorado School of Mines