Stress Corrosion Cracking of Candidate Structural Materials in Simulated First-Wall/Aqueous Coolant Environments
| Autor: | A. B. Hull, T. F. Kassner, M. R. Fox |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Aqueous solution
Materials science Yield (engineering) 020209 energy General Engineering 02 engineering and technology Intergranular corrosion Microstructure 01 natural sciences 010305 fluids & plasmas Corrosion Coolant 0103 physical sciences Ultimate tensile strength 0202 electrical engineering electronic engineering information engineering Stress corrosion cracking Composite material |
| Zdroj: | Fusion Technology. 19:1619-1628 |
| ISSN: | 0748-1896 |
| DOI: | 10.13182/fst91-a29573 |
| Popis: | Stress corrosion cracking (SCC) susceptibility of Types 316NG, 316, and 304 stainless steels (SS) was investigated in slow-strain-rate tests (SSRTs) in oxygenated water that simulates important parameters anticipated in first-wall/blanket systems. The water chemistry was based on a computer code which yielded the nominal concentrations of radiolytic species produced in an aqueous environment under ITER-type conditions. Actual SSRTs were performed in a less benign, more oxidizing reference environment at temperatures from 52 to 150{degree}C. Predominantly ductile fracture was observed in Type 316NG and nonsensitized Types 316 SS and 304 SS SSRT specimens strained to failure in a reference ITER water chemistry. The failure behavior of Type 304 SS specimens heat-treated to yield sensitization values of 2, 3, or 20 Coulomb (C)/cm{sup 2} by the electrochemical potentiokinetic reactivation (EPR) technique, demonstrated that the degree of sensitization had a dramatic effect on intergranular stress corrosion cracking (IGSCC) susceptibility. Ranking for resistance to SCC in simulated ITER water by electron microscopy and SSRT parameters, i.e., failure time, ultimate strength, total elongation and stress ratio is 304 SS (EPR = 20 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|