Pitting and stress corrosion cracking behavior of austenitic stainless steel weldments containing retained ferrite. Technical progress report No. 2, June 1, 1975--May 31, 1976
The critical pH for pitting protection is 8.5 for weld metal, 11.5 for as-received 304L ss. Re-passivation potentials measured using potentiokinetic scanning and after long-term testing were found not to be reproducible and accurate. Slow-strain-rate stress corrosion cracking (SCC) tests of as-received and welded 304L and 304 ss were conducted in boiling MgCl/sub 2/ solutions. The decreased strain rate led to increased SCC, with the threshold being at 4 x 10/sup -5/s/sup -1/. 304L ss exhibited intergranular failure below 135/sup 0/C and transgranular failure at 154/sup 0/C. A specimen containing a transverse weld failed in the heat affected zone when tested in liquid paraffin; in boiling MgCl/sub 2/, the failure occurred in the fusion zone. In boiling saturated NaCl, SCC occurred in as-received ss only at pH less than 2.5 and slowest strain rate, and in weld metal only at pH less than 1.0 and slowest strain rate, but H/sub 2/SO/sub 4/ or HCl + NaCl induces susceptibility. (DLC)
- Research Organization:
- Rensselaer Polytechnic Inst., Troy, N.Y. (USA). Dept. of Materials Engineering
- OSTI ID:
- 7152880
- Report Number(s):
- COO-2462-2
- Country of Publication:
- United States
- Language:
- English
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Slow strain rate stress corrosion cracking of Type 304 stainless steels. [135 and 154/sup 0/C]
Related Subjects
360105* -- Metals & Alloys-- Corrosion & Erosion
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
AQUEOUS SOLUTIONS
BOILING
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION
CORROSION RESISTANT ALLOYS
DISPERSIONS
HALIDES
HALOGEN COMPOUNDS
HEAT RESISTING ALLOYS
HIGH TEMPERATURE
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
MAGNESIUM CHLORIDES
MAGNESIUM COMPOUNDS
MIXTURES
NICKEL ALLOYS
PHASE TRANSFORMATIONS
PITTING CORROSION
RESEARCH PROGRAMS
SODIUM CHLORIDES
SODIUM COMPOUNDS
SOLUTIONS
STAINLESS STEEL-304
STAINLESS STEEL-304L
STAINLESS STEELS
STEELS
STRAIN RATE
STRESS CORROSION
WELDED JOINTS