Thermal creep modeling of HT9 steel for fast reactor applications

Ryu, Ho Jin; Kim, Yeon Soo; Yacout, Abdellatif M.

doi:10.1016/j.jnucmat.2010.12.232

Cited by 10 publications

(3 citation statements)

References 12 publications

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“…In this model, however, there is no tertiary creep rate expression, only a primary and secondary creep rate component are considered, as shown in Eq. (2.11) [10].…”

Section: Ryu Kim and Yacout Thermal Creep Modelmentioning

confidence: 99%

“…where ε𝑡𝑜𝑡𝑎𝑙 is the total creep strain rate over a time domain (nominally a timestep of the fuel performance code), ε𝑡ℎ.𝑡𝑜𝑡𝑎𝑙 is the sum of all contributions to the thermal creep strain rate, and ε𝑖𝑟𝑟.𝑡𝑜𝑡𝑎𝑙 is the sum of contributions to the irradiation creep strain rate. To calculate the thermal creep strain rate, two empirical models currently exist for HT-9 cladding in BISON: one from the Metallic Fuels Handbook (MFH) [9] and the other developed by Ryu et al (RKY) [10]. Although they present different functional forms, the underlying mechanics of their implementation into BISON is similar.…”

Section: Metallic Fuels Handbook and Ryu Kim And Yacout Creep Correla...mentioning

confidence: 99%

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Evaluation of Reduced Order Model for HT-9 Creep and Modifications to Current HT-9 Creep Model in BISON

Sweet

Novascone

2022

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In order to leverage existing reduced-order models (ROM) for material modeling, Los Alamos National Laboratory (LANL)-developed HT-9 cladding mechanistic-based constitutive models have been implemented into BISON. It is posited that the increased fidelity of the ROM will show improvement over engineering-scale models in terms of comparison against experimental measurements. Idaho National Laboratory will assist LANL in implementing an HT-9 ROM in BISON. Once the HT-9 mechanistic constitutive model can be leveraged in nuclear performance simulations, the numerical results of fast reactor models will be analyzed and compared against the Fuels Irradiation & Physics Database and separate effects tests to attempt a validation process. Idaho National Laboratory and LANL will work together to perform any necessary improvement identified during the implementation and use processes. Successful milestone completion will enable the general use of validated mechanistic ROMs for HT-9 cladding in BISON.This report provides a brief introduction to the Los Alamos Reduced Order Model Applied to Nonlinear Constitutive Equations (LAROMance) code, mechanical testing used to illustrate its creep and plastic deformation predictions for HT-9 cladding, and a comparison with existing models implemented into BISON. Current models have been modified to more appropriately account for primary thermal creep, and results for corresponding testing are included in this report.

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“…In this model, however, there is no tertiary creep rate expression, only a primary and secondary creep rate component are considered, as shown in Eq. (2.11) [10].…”

Section: Ryu Kim and Yacout Thermal Creep Modelmentioning

confidence: 99%

Section: Metallic Fuels Handbook and Ryu Kim And Yacout Creep Correla...mentioning

confidence: 99%

Evaluation of Reduced Order Model for HT-9 Creep and Modifications to Current HT-9 Creep Model in BISON

Sweet

Novascone

2022

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“…Figure23also shows the stress exponent values obtained by load-to-failure creep tests for HT-9 F/M steel[9] and three austenitic stainless steels[10,11]. The calculated stress exponent values for OFRAC and those obtained for HT-9 and the stainless steels are shown in the legends of Figure23and are plotted as a function of test temperature in Figure 24.…”

mentioning

confidence: 98%

Complete Status Report Documenting the Processing, Microstructure and High-Temperature Mechanical Properties of the Nanostructured Ferritic Alloy OFRAC

Hoelzer¹,

Seibert²,

Massey³

2019

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This report provides a summary of the new nanostructured ferritic alloy, OFRAC (Oak Ridge Fast Reactor Advanced Fuel Cladding), that was developed for the advanced sodium fast reactor fuel cladding and core internals. The composition of OFRAC, which is Fe-12Cr-1Mo-03.Ti-0.3Nb + 0.3Y2O3 (wt. %), was chosen to achieve high temperature strength as well as high temperature creep performance and swelling resistance requirements that past structural materials such as austenitic stainless steels and ferritic/martensitic steels, i.e. HT-9, are not suitable as SFR cladding materials. The mechanical alloying procedures were described for producing OFRAC and the detailed characterization studies revealed uniformly distributed, high concentration of Y-Ti-O enriched oxide particles, or nanoclusters. The Nb addition that was intended to sequester interstitial C and N that are commonly introduced as contamination during ball milling of powder was found to be very effective in forming coarse size Nb carbonitrides along with excess Ti that removes these interstitial elements from the bcc-Fe matrix of OFRAC. The tensile tests on the OFRAC in the extruded condition showed excellent balance in strength and ductility from room temperature to 800ºC. Both the microstructure and tensile properties were not significantly degraded after annealing the extruded OFRAC samples for 8 h at 1050ºC and 1150ºC. The latter temperature is ~76% of the melting point of OFRAC. These results demonstrated the stability of the microstructure and tensile properties to extremely high temperatures. The thermal creep resistance at elevated temperatures and stresses was investigated using strain rate jump testing. The results showed that OFRAC possessed high stress exponents at high stresses and temperatures of 550ºC, 600ºC, 700ºC and 800ºC. This thermal dependence of minimum creep rate indicates that OFRAC will show quite low creep rates at higher temperatures and stresses compared to HT-9 and stainless steels. These significant improvements indicate that the NFA OFRAC alloy is a compelling and viable choice for sodium fast reactor fuel cladding.

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Creep Property and Correlation of Diffusion-Welded Alloy 800H Tubes for Printed Circuit Heat Exchangers and Steam Generators

et al. 2023

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Thermal creep modeling of HT9 steel for fast reactor applications

Cited by 10 publications

References 12 publications

Evaluation of Reduced Order Model for HT-9 Creep and Modifications to Current HT-9 Creep Model in BISON

Evaluation of Reduced Order Model for HT-9 Creep and Modifications to Current HT-9 Creep Model in BISON

Complete Status Report Documenting the Processing, Microstructure and High-Temperature Mechanical Properties of the Nanostructured Ferritic Alloy OFRAC

Creep Property and Correlation of Diffusion-Welded Alloy 800H Tubes for Printed Circuit Heat Exchangers and Steam Generators

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