To eliminate this uncertainty, a high-restraint, narrow groove weld mockup was developed to assess DDC in this work. Due to the complexities of welding, there are potentially significant differences in the strain, strain-rates, stresses, and thermal cycles that can occur between these small-scale test methods and actual welding conditions. Research conducted to develop these theories has primarily been performed using test methods involving small-scale specimens that may not replicate actual welding conditions (e.g., strain-to-fracture, hot-ductility, and varestraint). DDC is a solid-state cracking phenomenon, and several theories have been proposed for the mechanism. Ductility-dip cracking (DDC) in high chromium nickel-base weld metals has been an issue during fabrication and repair of nuclear power plant components for many years.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |