Slow strain rate stress corrosion cracking of Type 304 stainless steels
Slow strain rate experiments have been performed on Type 304L and 304 stainless steel sheet material in boiling MgCl/sub 2/ as a function of solution temperature and strain rate. Additionally, some experiments were performed on specimens containing a single transverse weldment with a duplex delta - ..gamma.. structure and on all-weld specimens. Results indicate that intergranular stress corrosion cracking (SCC) is observed at temperatures below 135/sup 0/C and transgranular cracking is observed at 154/sup 0/C. Corrosion potential measurements showed a shift in the active direction upon yielding indicating a film rupture process, exposing active metal to the corrosive environment. The crack path appears to be determined by the Cl/sup -/ concentration with higher concentrations resulting in preferential reactions at emerging slip bands and lower concentrations reacting in the vicinity of grain boundaries. Specimens containing a single transverse weld showed cracking in the delta - ..gamma.. interface at both 135 and 154/sup 0/C, apparently due to non-equilibrium solute segregation. All welded specimens showed interphase cracking at all solution temperatures.
- Research Organization:
- Rensselaer Polytechnic Inst., Troy, NY
- OSTI ID:
- 5740318
- Journal Information:
- Corrosion; (United States), Journal Name: Corrosion; (United States) Vol. 33:2; ISSN CORRA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103 -- Metals & Alloys-- Mechanical Properties
360105* -- Metals & Alloys-- Corrosion & Erosion
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
CRACKS
HALIDES
HALOGEN COMPOUNDS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
MAGNESIUM CHLORIDES
MAGNESIUM COMPOUNDS
MATERIALS
NICKEL ALLOYS
STAINLESS STEEL-304
STAINLESS STEEL-304L
STAINLESS STEELS
STEELS
STRAIN RATE
STRESS CORROSION
WELDED JOINTS