Effects of sensitization heat treatment on SCC of type 316L stainless steel in hot lithium hydroxide solution
- Univ. of Leuven (Belgium)
This paper describes the effect of extended sensitization heat treatment (650 C) and applied potential on the corrosion behavior and the stress corrosion cracking (SCC) of low-carbon AISI 316L (UNS S31603) stainless steel (0.02%C) in a concentrated lithium hydroxide solution at 95 C. The results are compared to the behavior of solution-annealed material under the same conditions. In general, there is a fairly clear effect of prolonged heat treatment times one the material, and its susceptibility to intergranular attack (IGA) and SCC, as determined in slow strain rate tests, increases with increasing times of sensitization heat treatment. When the heat treatment extends to 100 h or more, the potential range in which IGA is observed extends to lower potentials ([minus]300 mV SCE, open-circuit conditions) compared to the solution-annealed material. ON the other hand, SCC is observed on both materials in approximately the same potential ranges (i.e., above approximately [minus]100 mV SCE). However, both intergranular and transgranular cracking occur with the heat-treated specimens. Moreover, transgranular SCC, not intergranular SCC, is even the predominant fracture mode when the heat treatment time is increased to 200 h, if the applied potential is sufficiently high with the solution-annealed material. A possible explanation for these different results and for the effects of sensitization treatment is provided based on the electrochemical and the surface-chemical behavior of the alloy.
- OSTI ID:
- 6373945
- Journal Information:
- Corrosion (Houston); (United States), Vol. 49:1; ISSN 0010-9312
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Ma
ITER TOKAMAK
THERMONUCLEAR REACTOR MATERIALS
NET TOKAMAK
STAINLESS STEEL-316L
STRESS CORROSION
CORROSION RESISTANCE
CORROSIVE EFFECTS
CRACK PROPAGATION
ELECTRIC POTENTIAL
HEAT TREATMENTS
INTERGRANULAR CORROSION
LITHIUM HYDROXIDES
METALLURGICAL EFFECTS
STRAIN RATE
ALKALI METAL COMPOUNDS
ALLOYS
AUSTENITIC STEELS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CHROMIUM-NICKEL-MOLYBDENUM STEELS
CLOSED PLASMA DEVICES
CORROSION
CORROSION RESISTANT ALLOYS
HEAT RES
HIGH ALLOY STEELS
HYDROGEN COMPOUNDS
HYDROXIDES
IRON ALLOYS
IRON BASE ALLOYS
LITHIUM COMPOUNDS
MATERIALS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
OXYGEN COMPOUNDS
STAINLESS STEELS
STEEL-CR17NI12MO3-L
STEELS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700480* - Fusion Technology- Component Development
Materials Studies- (1992-)