The effect of potential on the high-temperature fatigue crack growth response of low alloy steels: Part II, electrochemical results

Conference · Tue Apr 01 00:00:00 EST 1997

OSTI ID:464503

Moshier, W C; James, L A

Environmentally assisted cracking (EAC) in low alloy steels was found to be dependent on externally applied potential in low sulfur steels in high temperature water. EAC could be turned on when the specimen was polarized anodically above a critical potential. However, hydrogen (H) additions inhibited the ability of potential to affect EAC. The behavior was related to formation of H ions during H oxidation at the crack mouth. A mechanism based on formation of H sulfide at the crack tip and H ions at the crack mouth is presented to describe the process by which sulfides and H ions affect the critical sulfide concentration at the crack tip.

• Research Organization: Bettis Atomic Power Lab., West Mifflin, PA (United States)
• Sponsoring Organization: USDOE Assistant Secretary for Nuclear Energy, Washington, DC (United States)
• DOE Contract Number: AC11-93PN38195
• OSTI ID: 464503
• Report Number(s): WAPD-T-3139; CONF-970490-1; ON: DE97004549; TRN: 97:010040
• Resource Relation: Conference: International coordinating group on environmentally assisted cracking (ICG-EAC/ICG-IASCC), Bristol (United Kingdom), 6-11 Apr 1997; Other Information: PBD: [1997]
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
LOW ALLOY STEELS
CRACK PROPAGATION
ELECTROCHEMISTRY
ELECTRIC POTENTIAL
SULFUR ADDITIONS
HYDROGEN EMBRITTLEMENT