ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
A number of mechanisms have been proposed to understand stress corrosion cracking(SCC) of metals, e.g. (1) slip dissolution and active pass corrosion based on anodic dissolution ofmetals, (2) tarnish rupture and internal oxidation based on oxidation ahead the crack tip followed bycracking of the oxides, and (3) hydrogen cracking, etc.If dissolution of metals takes the essential role in the stress corrosion cracking concerned,cracking susceptibility is expected to be significantly affected by dielectric constant of water.Because dielectric constant represents a character of water as a solvent, which determines solubilityof metal oxides, and therefore corrosion rate of metals is strongly dependent on dielectric constantof water.K-constant type SCC growth rate tests have been done as a function of physical property(dielectric constant) of water by either manipulating temperature under iso-pressure condition(15MPa) or manipulating pressure under iso-thermal condition (330oC). Intergranular cracking wasmore enhanced and the crack growth was significantly accelerated under the condition of higherdielectric constant, indicating that dissolution of metal plays important role in the crackingmechanism of 316L stainless steels under the present testing conditions
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.270.pdf
Permalink