Influence of Al addition on the microstructure and mechanical properties of Zr-containing 9Cr-ODS steel

Wang, Jianjie; Long, Dijun; Yu, Liming; Liu, Yongchang; Li, Huijun; Wang, Zumin

doi:10.1016/j.jmrt.2021.05.112

Cited by 18 publications

(3 citation statements)

References 36 publications

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“…It is reported that the aluminum content significantly enhances the oxidation resistance of the ODS steel event at 1200°C [11]. Al addition can be suppressed the precipitation of coarse M23C6 in 9Cr-ODS-Al, with the size of carbides in is smaller than that in free aluminum 9Cr-ODS [12]. Good structural stability under ion irradiation up to 20 dpa of oxide nanoparticles in 12Cr-6Al ODS ferritic steel is repoted [13].…”

Section: Introductionmentioning

confidence: 99%

Development of an Oxide Dispersion Strengthened Austenitic Steel Powder with 4% Aluminum Addition

Rivai¹,

Shabrina²,

Sugeng³

2022

MSF

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Development of accident-tolerant fuel (ATF) cladding materials for LWR (Light Water Reactors) is being intensively carried out in many research centers in the world as the lesson-learned from the Fukushima Daiichi nuclear reactor power plant accident. One of the advanced high temperature materials which is intensively developed is Oxide Dispersion strengthened (ODS) steel. The strengthened mechanism is generated by homogeneous dispersion of nanometer sized ceramic oxide particles in the matrix of the steel which is done by mechanical alloying technique so called mechanosynthesis. Synthesis of an austenitic ODS steel powder of SS316L with additional element of 4% aluminum and dispersion of nanoparticles of 0.5% yttrium oxide (yttria: Y2O3) has been done. The aim of the research is to achieve a better performance of SS316L steel as the established material for power plant at elevated temperature. Mechanosynthesis was done using High Energy ball Milling (HEM) for 30 hours with BPR (Ball to Powder Ratio) of 10:1. Afterward, the sample was characterized using Scanning Electron Microscope-Energy Dispersive Spectroscope (SEM-EDS) and X-ray diffraction (XRD) to analyze the microstructure characteristics. The results showed that the alloying between SS316L and aluminum powders was formed. Furthermore, crystal grains and the particles of SS316L-4Al-0.5Y2O3 powder was smaller than as received SS316L and aluminum powders.

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Section: Introductionmentioning

confidence: 99%

Development of an Oxide Dispersion Strengthened Austenitic Steel Powder with 4% Aluminum Addition

Rivai¹,

Shabrina²,

Sugeng³

2022

MSF

View full text Add to dashboard Cite

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“…The protection of the base material against microstructural degradation and elemental dissolution was possible through the formation of the alumina layer on top of the aluminide layers through controlled thermal cycling; on the other hand, the formation of self-healing oxides in/between the aluminide scales during thermal cycling was observed [30]. The addition of Al particles could significantly increase the ductility but it decreased the strength of the 9Cr-ODS steel because of the formation of large nanosized Y-Al-O particles [31]. Other research has shown that it is possible to increase the corrosion resistance of austenitic steels by adding aluminium [32].…”

Section: Introductionmentioning

confidence: 99%

Novel Alumina Dispersion-Strengthened 316L Steel Produced by Attrition Milling and Spark Plasma Sintering

et al. 2023

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Alumina dispersion-strengthened 316L stainless steels were successfully produced using attrition milling and spark plasma sintering. Two different composites (316L/0.33 wt% and 316L/1 wt% Al2O3) were prepared by powder technology. The attrition milling produced a significant morphological transformation of the globular 316L starting powders and provided a homogeneous distribution of the nanosized alumina particles. The XRD results confirmed that the 316L steel was an austenitic γ-Fe3Ni2. The formation of a ferrite α-Fe phase was detected after milling; this was transformed to the austenitic γ-Fe3Ni2 after the sintering process. The addition of nanosized alumina particles increased the composites’ microhardness significantly to 2.25 GPa HV. With higher amounts of alumina, the nanosized particles tended to agglomerate during the milling process. The friction coefficient (FC) of the 316L/0.33 wt% Al2O3 and the 316L/1 wt% Al2O3 decreased because of the increase in the composite’s hardness; FC values of 0.96, 0.93 and 0.85, respectively, were measured respectively for the 316L reference, the 316L/0.33 wt% and the 316L/1 wt% Al2O3. The 316L/0.33 wt% Al2O3 composite had a higher flexural strength of 630.4 MPa compared with the 316L/1 wt% Al2O3 with 386.6 MPa; the lower value of the latter was related the agglomeration of the alumina powder during attrition milling.

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“…It is generally accepted that the exact compositions, structures, and number densities of Y-X-O nano-oxides are highly sensitive to alloy compositions. Several experiments have suggested Zr alloying can induce finer nano-oxides in NFAs, such as, for example, Ti + Zr co-alloying refined Y-Ti-O nano-oxides to less than 10 nm on average [12][13][14]. Y + Zr coalloying in FeCrAl-based NFAs can greatly reduce the number of coarse Y-Al-O nano-oxides in favor of finer Y-Zr-O nano-oxides [5,[15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Stoichiometric and Nonstoichiometric Surface Structures of Pyrochlore Y2Zr2O7 and Their Relative Stabilities: A First-Principles Investigation

Zhang

Wang

et al. 2023

Coatings

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First-principle total energy calculations were performed to investigate the atomic structures and relative stabilities of two low miller-index surfaces of pyrochlore Y2Zr2O7. The stoichiometric Y2Zr2O7 (110) and (100) surfaces were predicted, with lowest formation energies of 1.20 and 1.47 J/m2, respectively. Based on a thermodynamic defect model, non-stoichiometric Y2Zr2O7 surface energies were further evaluated as a function of environmental oxygen partial pressure (pO2) and temperature (T). With all of the results, we were able to construct the surface phase diagrams for T = 300 and 1400 K. The strong correlation between the structural stabilities and the surface stoichiometry was revealed as varying T and pO2. At a given T, the most stable termination of the (110) surfaces would change from a (Y,Zr)−rich (ns−2Y2Zr6O) to O−rich ones (ns−4O_2 and ns−4O_1) as increasing pO2, while that of the (100) surfaces would change from the stoichiometric (stoi−1Y1Zr_1) to the O−rich one (ns−5O). The critical pO2 value for termination transition moves to its higher end as increasing T.

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Influence of Al addition on the microstructure and mechanical properties of Zr-containing 9Cr-ODS steel

Cited by 18 publications

References 36 publications

Development of an Oxide Dispersion Strengthened Austenitic Steel Powder with 4% Aluminum Addition

Development of an Oxide Dispersion Strengthened Austenitic Steel Powder with 4% Aluminum Addition

Novel Alumina Dispersion-Strengthened 316L Steel Produced by Attrition Milling and Spark Plasma Sintering

Stoichiometric and Nonstoichiometric Surface Structures of Pyrochlore Y2Zr2O7 and Their Relative Stabilities: A First-Principles Investigation

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