Microstructural characterizations of 14Cr ODS ferritic steels subjected to hot torsion

Karch, Abdellatif; Sornin, Denis; Barcelo, Françoise; Bosonnet, Sophie; Carlan, Y. de; Logé, Roland E.

doi:10.1016/j.jnucmat.2014.12.104

Cited by 14 publications

(3 citation statements)

References 23 publications

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“…For instance, the ferritic and martensitic structure resists irradiation swelling to doses up to 200 dpa, while the nano-oxide uniform distribution improves the creep strength at temperatures up to 700 • C [4,5]. Numerous ODS ferritic-martensitic alloys with different chromium contents have been developed and characterized: 9Cr martensitic alloys [6], 12Cr ferritic alloys [7], 14Cr ferritic alloys [8], 18Cr ferritic alloys [9] and 20Cr ferritic alloys [10].…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Pressure Resistance Welding Process for Nuclear Fuel Cladding Coupling Experimental and Numerical Approaches

Mabrouki

Gonçalves

Pascal

et al. 2023

Metals

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An approach coupling experimental tests and numerical simulation of the pressure resistance welding (PRW) process is proposed for optimizing fuel cladding welds for the new generation of nuclear reactors. Several experimental welds were prepared by varying the dissipated energy, which accounts for the effect of electric current and welding time applied during the PRW process. A working zone, a function of both applied dissipated weld energy and plug-displacement, was then identified on the basis of the microscopy observations of the weld defects. In addition, the numerical approach, based on a 2D axisymmetric multi-physics finite element model, was developed to simulate the PRW process in a plug-tube configuration. The proposed model accounted for interactions between the electrical, thermal and mechanical phenomena and the electro-thermo-mechanical contact between the pieces and electrodes. Numerical simulations were first validated by comparison to experimental measurements, notably by comparing the plug-displacement and the size and position of the heat-affected zone (HAZ). They were then used to assess the effect of the applied parameters on the maximum temperature and cumulated plastic strain reached during welding and the effect of the welding force on the quality of the weld. According to the numerical computations, the maximum temperature reached in the weld remains well below the melting temperature. Changing the welding force implies also modifying the applied energy in order to maintain the quality of the welds. Applied to different plug and clad geometries, the proposed model was shown to be useful for optimizing the joint plane for such a welding configuration.

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Section: Introductionmentioning

confidence: 99%

Optimization of the Pressure Resistance Welding Process for Nuclear Fuel Cladding Coupling Experimental and Numerical Approaches

Mabrouki

Gonçalves

Pascal

et al. 2023

Metals

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“…Alamo et. al studied the high-temperature behavior of 14Cr ferritic ODS steel of two different microstructures [4,14]. They stated that the high-temperature strength of high chromium ferritic steel is determined by several parameters like oxide particle distribution, grain size ,and texture.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Hot Pressed 16.5CR Ferritic ODS Steel Developed Through Mechanical Alloying

Dharmalingam¹,

Tjprc²

2018

IJMPERD

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Two different ferritic oxide-dispersion-strengthened (ODS) steels compositions Fe-16.5Cr-0.89Mn-0.3Y 2 O 3-2ZrO 2 (Sample1) and Fe-16.5Cr-0.89Mn-0.3Y 2 O 3-2ZrO 2-2Al (Sample2) were prepared through Mechanical Alloying (MA) and X-Ray Diffraction (XRD) pattern were taken at different time intervals for confirming the Nano-crystallite size. Milled powders were consolidated at 1170 O C at three different pressure levels of 30, 40 and 60 MPa respectively. Densification studies, microstructural examination ,and mechanical properties evaluation were analyzed and reported in the current study. MA of the hot pressed powder at 60 MPa obtained the highest density, hardness ,and tensile strength compared with another pressure compact irrespective of its composition. Aluminum addition in the ferritic ODS steel lowers the density, hardness ,and elongation of the ferritic ODS steel samples.

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“…Tension‐torsion tests on 9Cr steels indicate that the RCC‐MRx efficiency diagram would lead to lower estimated cumulative strains than experimental observations . Strain accommodation at the grain boundaries of oxide dispersion strengthened (14Cr‐ODS) steels under torsion tests is considered as one of the main reasons that drives the nucleation and growth of cavities along the grain boundaries …”

Section: Introductionmentioning

confidence: 99%

Atomistic Simulation of Interstitial Dislocation Loop Evolution under Applied Stresses in BCC Iron

Long

Wang

Liu

et al. 2017

Physica Status Solidi (a)

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Evolution of an interstitial 1/2h111i dislocation loop under tensile, shear, and torsion stresses is studied with molecular statics method. Under a tensile stress, the dependence of ultimate tensile strength on size of loop is calculated. The formation of small shear loops around the initial prismatic loop is confirmed as an intermediate state to form the final dislocation network. Under a shear stress, the rotation of a loop is observed not only by a change of the habit plane but also through a transformation between a shear and a prismatic loop. Under torsion, a perfect BCC crystal may undergo a BCC to FCC or BCC to HCP transformation. The present work indicates that a 1/2h111i loop can delay these transformations, resulting in the formation of micro-crack on the surface.

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Microstructural characterizations of 14Cr ODS ferritic steels subjected to hot torsion

Cited by 14 publications

References 23 publications

Optimization of the Pressure Resistance Welding Process for Nuclear Fuel Cladding Coupling Experimental and Numerical Approaches

Optimization of the Pressure Resistance Welding Process for Nuclear Fuel Cladding Coupling Experimental and Numerical Approaches

Microstructure and Mechanical Properties of Hot Pressed 16.5CR Ferritic ODS Steel Developed Through Mechanical Alloying

Atomistic Simulation of Interstitial Dislocation Loop Evolution under Applied Stresses in BCC Iron

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