Microstructural evaluation of a Fe-12Cr nanostructured ferritic alloy designed for impurity sequestration

Massey, Caleb; Hoelzer, David T.; Seibert, Rachel; Edmondson, Philip D.; Kini, Anoop; Gault, Baptiste; Terrani, Kurt A.; Zinkle, Steven J.

doi:10.1016/j.jnucmat.2019.05.019

Cited by 11 publications

(10 citation statements)

References 70 publications

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“…11a) shows 1.5 at.% (Y,TiO) isoconcentration surfaces (green particles) associated with the nanoclusters combined with the 0.1 at.% Fe atom map of the matrix. The average diameter and number density of the Ti-Y-O enriched nanoclusters obtained from analysis of 1871 clusters was 2.19 +/-0.02 nm and 6.8 × 10 23 +/-0.66 × 10 23 m -3 , respectively [8]. The composition correlated with the size of the analyzed nanoclusters is shown in the Y-Ti-O ternary diagram (Fig.…”

Section: As-extrudedmentioning

confidence: 87%

“…The APT tip was analyzed on either a CAMECA Local electrode atom probed (LEAP) 4000X HR or a CAMECA LEAP 5000XR, which possessed dectection efficiencies of 36% and 52%, respectively. Details of the operating perameters used in the APT analysis have been recently published [8].…”

Section: Microstructurementioning

confidence: 99%

“…A thorough discussion of the challenges in determining the composition of nanoclusters by APT including the CCC model is provided in the recent publication by C.P. Massey et al [8].…”

Section: As-extrudedmentioning

confidence: 99%

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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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Section: As-extrudedmentioning

confidence: 87%

Section: Microstructurementioning

confidence: 99%

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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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“…[ 124 ], or produces potential embrittlement due to large TiO 2 particles [ 125 ], which will damage the mechanical properties. The ternary Y–Ti–O composition diagram [ 126 ] well explains the influence of the Ti content on the type of Y–Ti–O phase. As shown in Figure 17 b, with increasing Ti content, the type of Y–Ti–O phase changes from Y 2 TiO 5 , Y 2 Ti 2 O 7 , to TiO 2 .…”

Section: Influence Of Elements On Microstructure and Propertiesmentioning

confidence: 99%

“…However, when C and N are removed completely from the alloy system ( Figure 23 b), the high affinity of both Zr and Al for O in solution leads to a competition for the formation of Zr 3 Y 4 O 12 and YAP (YAlO 3 ) at the annealing/extrusion temperature of 1000 °C. In other work by Massey et al [ 126 ], this concept of impurity sequestration was used to optimize the alloy composition and microstructure.…”

Section: Influence Of Elements On Microstructure and Propertiesmentioning

confidence: 99%

Research Progress of ODS FeCrAl Alloys–A Review of Composition Design

Wang,

Shen

2023

Materials

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After the Fukushima nuclear accident, the development of new accident-tolerant fuel cladding materials has become a research hotspot around the world. Due to its outstanding corrosion resistance, radiation resistance, and creep properties at elevated temperatures, the oxide dispersion strengthened (ODS) FeCrAl alloy, as one of the most promising candidate materials for accident-tolerant fuel cladding, has been extensively studied during the past decade. Recent research on chemical composition design as well as its effects on the microstructure and mechanical properties has been reviewed in this paper. In particular, the reasonable/optimized content of Cr is explained from the aspects of oxidation resistance, radiation resistance, and thermal stability. The essential role of the Al element in oxidation resistance, high-temperature stability, and workability was reviewed in detail. The roles of oxide-forming elements, i.e., Y (Y2O3), Ti, and Zr, and the solid solution strengthening element, i.e., W, were discussed. Additionally, their reasonable contents were summarized. Typical types of oxide, i.e., Y–Ti–O, Y–Al–O, and Y–Zr–O, and their formation mechanisms were also discussed in this paper. All aspects mentioned above provide an important reference for understanding the effects of composition design parameters on the properties of nuclear-level ODS FeCrAl alloy.

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In-situ synthesis via laser metal deposition of a lean Cu–3.4Cr–0.6Nb (at%) conductive alloy hardened by Cr nano-scale precipitates and by Laves phase micro-particles

et al. 2020

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Microstructural evaluation of a Fe-12Cr nanostructured ferritic alloy designed for impurity sequestration

Cited by 11 publications

References 70 publications

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

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

Research Progress of ODS FeCrAl Alloys–A Review of Composition Design

In-situ synthesis via laser metal deposition of a lean Cu–3.4Cr–0.6Nb (at%) conductive alloy hardened by Cr nano-scale precipitates and by Laves phase micro-particles

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