|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Temperature Corrosion of Structural Materials
||The Influence of External Stress on High Temperature Hydrogen Attack (HTHA) Cracking
||Raymond Thompson, Dustin K Nolen
|On-Site Speaker (Planned)
HTHA is a cracking mode known to many industries, especially petrochemical. The mode of cracking occurs in carbon steels in the processing range above about 500°F and 100 psi of hydrogen pressure (Nelson Diagram). Catastrophic failures have been well documented with the common denominator of hydrogen diffusion and reaction with carbon in the steel to create cracks. Another common attribute is the formation and growth of cracks at the weld HAZ, leading to failures along weld seams. This paper reports on studies of HTHA in laboratory samples of 1045 carbon steel plates (3/4in x 14in x 14in) containing a full-thickness weld seam. The process conditions used for this study were 700°F and 700psi hydrogen pressure. HTHA cracking occurred parallel to the face of the hydrogen-pressured faces when no external stress was applied. When external stress was applied, cracking moved deeper into the plate and initiated at the weld HAZ.
||Planned: Supplemental Proceedings volume