Quantitative Modeling of Sensitization Development in Austenitic Stainless Steel
Количественное моделирование развития сенситизации в аустенитных нержавеющих сталях
1990-07-01
SCID: 54.1/vry4c489
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UNS S30400 (Type 304)UNS S31600 (Type 316)austenitic stainless steelcarbide precipitationchromium depletiondegree of sensitization (DOS)electrochemical potentiokinetic reactivation (EPR) testisothermal sensitizationsensitization development
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Abstract (AI)
Existing capabilities to quantitatively model carbide precipitation and sensitization development in austenitic stainless steels are assessed and critically analyzed. A theoretically based, empirically modified model is described that predicts carbide nucleation kinetics, chromium depletion characteristics, and material degree of sensitization (DOS) as measured by the electrochemical potentiokinetic reactivation (EPR) test. Individual model components are validated by correlation to the available database including direct comparisons to grain-boundary chromium depletion. The model is shown to quantitatively predict isothermal sensitization development in a large number of commercial type 304 (UNS(1) S30400) and 316 (UNS S31600) stainless steel (SS) heats. This work represents a first step to evolve methods that realistically assess microstructural characteristics and structural reliability in stainless steel components and weldments.
Key Findings
1
A theoretically based, empirically modified model is developed to predict carbide nucleation kinetics, chromium depletion, and degree of sensitization (DOS) measured by EPR.
2
Individual components of the model are validated against available databases, including direct comparisons to grain-boundary chromium depletion data.
3
The model quantitatively predicts isothermal sensitization development for many commercial type 304 (UNS S30400) and 316 (UNS S31600) stainless steel heats.
4
This modeling approach is positioned as a first step toward realistic assessment methods for microstructural characteristics and structural reliability in stainless steel components and weldments.
Research Object
Austenitic stainless steel heats (commercial Type 304 and 316) undergoing carbide precipitation and sensitization
Research Subject
Quantitative modeling and prediction of carbide nucleation kinetics, chromium depletion at grain boundaries, and evolution of degree of sensitization (DOS) as measured by the EPR test under isothermal sensitization
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1990-07-01
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