Microstructure Refinement and Strengthening Mechanisms of a 9Cr Oxide Dispersion Strengthened Steel by Zirconium Addition

Xu, Haijian; Lu, Zheng; Wang, Dongmei; Liu, Chun Ming

doi:10.1016/j.net.2017.01.002

Cited by 58 publications

(12 citation statements)

References 34 publications

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“…This phenomenon may be explained that microalloying process using acoustic probe in toluene solution resulted cavitation explosion that can produce jetting with high pressure and very high temperature. These results can be used for reducing the particle size and even alloying metals [14,[19][20][21]. The alloying process was then continued in the sintering process by merge two or more elements utilize heat from the furnace.…”

Section: Resultsmentioning

confidence: 99%

“…The greatest value obtained by the Fe-Cr-Y 2 O 3 sample with 60% amplitude. In this process the diffusion occurs in grain and lattice boundaries and results in significant grain growth which increases the strength of ODS steel alloys [21]. proportional to the value of the hardness and density of the material which shows the consolidation performance of ODS steel alloys.…”

Section: Resultsmentioning

confidence: 99%

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EFFECT OF ULTRASONIC TREATMENT ON THE CONSOLIDATION OF ODS STEEL FeCrY2O3 PROCESSING WITH CAPSULATED SINTERING PROCESS.

Silalahi

Bandriyana

Bayu

et al. 2020

jsmi

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EFFECT OF ULTRASONIC TREATMENT ON THE CONSOLIDATION OF ODS STEEL FeCrY2O3 PROCESSING WITH CAPSULATED SINTERING PROCESS. A new method on the synthesis of ODS (Oxide Dispersion Strengthened) steel for advanced nuclear material was performed by ultrasonic treatment to improve the consolidation process. The raw material of Fe, Cr and Y2O3powder with the composition of Fe-15 wt% Cr, 0.5 wt% and Ytria (Y2O3) as disperzoid were processed by the powder metallurgy method with the main process of pre-alloying, iso-compaction and sintering process. The pre-alloying process was carried out by mixing the alloying elements using ultrasonically treatment at frquency of 20 kHz with variation of 40, 50 and 60 % amplitude. Iso-compaction process was done using the load of 800 psi to obtain a pellet-shaped sample, then continued by the sintering process for consolidation. The sintering process was done in two stages, 1-step sintering and 2-steps sintering, using the heating furnace by putting the sample in a quartz capsule to prevent oxidation attack. Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy (SEM-EDS), X-ray Diffraction (XRD), and Micro-hardness tests were carried out to analyze the microstructure and phase formation in relation to the consolidation process. The highest hardness occurred in the addition of treatment with an amplitude of 60% which produces a micro structure with the most fine grain. For 1-step sintering process, the highest hardness of 134.51 VHN obtained at 40 % amplitude. The hardness of the alloy depends on the size of the grain boundary associated with the difficulty of the dislocation movement.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

EFFECT OF ULTRASONIC TREATMENT ON THE CONSOLIDATION OF ODS STEEL FeCrY2O3 PROCESSING WITH CAPSULATED SINTERING PROCESS.

Silalahi

Bandriyana

Bayu

et al. 2020

jsmi

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“…where k HP (MPa.m 1/2 ) is the Hall-Petch coefficient and d (µm) is the average diameter of grains. Assuming 9Cr steel with a yield strength of matrix σ m = 255 MPa, Taylor factor M = 3.06, shear modulus G = 80 GPa, Burgers vector b = 0.248 nm, and Hall-Petch coefficient k HP = 210 MPa•m 1/2 [9,27,35], the overall yield strength of all five prepared steels as well as the individual strengthening contributions can be calculated according to the Equations (4)- (6). The results are summarized in Table 5.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

ODS EUROFER Steel Strengthened by Y-(Ce, Hf, La, Sc, and Zr) Complex Oxides

Husak

Hadraba

Chlup

et al. 2019

Metals

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Oxide dispersion-strengthened (ODS) materials contain homogeneous dispersions of temperature-stable nano-oxides serving as obstacles for dislocations and further pinning of grain boundaries. The strategy for dispersion strengthening based on complex oxides (Y-Hf, -Zr, -Ce, -La) was developed in order to refine oxide dispersion to enhance the dispersion strengthening effect. In this work, the strengthening of EUROFER steel by complex oxides based on Y and elements of the IIIB group (lanthanum, scandium) and IVB group (cerium, hafnium, zirconium) was explored. Interparticle spacing as a dispersoid characteristic appeared to be an important factor in controlling the dispersion strengthening contribution to the yield strength of ODS EUROFER steels. The dispersoid size and average grain size of ODS EUROFER steel were altered in the ranges of 5–13 nm and 0.6–1.7 µm, respectively. Using this strategy, the yield strength of the prepared alloys varied between 550 MPa and 950 MPa depending on the doping element.

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“…A promising route is, for instance, to add Zr [35]. In fact, its addition has already been used successfully to strengthen both light alloys [36] and steels [37]. The expected strengthening mechanism related to Zr modifications of HEAs is dislocation pinning, which can be due to severe lattice distortion.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Zr Addition on Melting Temperature, Microstructure, Recrystallization and Mechanical Properties of a Cantor High Entropy Alloy

et al. 2021

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The effect of Zr addition on the melting temperature of the CoCrFeMnNi High Entropy Alloy (HEA), known as the “Cantor’s Alloy”, is investigated, together with its micro-structure, mechanical properties and thermomechanical recrystallization process. The base and Zr-modified alloys are obtained by vacuum induction melting of mechanically pre-alloyed powders. Raw materials are then cold rolled and annealed. recrystallization occurred during the heat treatment of the cold-rolled HEA. The alloys are characterized by X-ray diffraction, electron microscopy, thermal analyses, mechanical spectroscopy and indentation measures. The main advantages of Zr addition are: (1) a fast vacuum induction melting process; (2) the lower melting temperature, due to Zr eutectics formation with all the Cantor’s alloy elements; (3) the good chemical alloy homogeneity; and (4) the mechanical properties improvement of re-crystallized grains with a coherent structure. The crystallographic lattice of both alloys results in FCC. The Zr-modified HEA presents a higher recrystallization temperature and smaller grain size after recrystallization with respect to the Cantor’s alloy, with precipitation of a coherent second phase, which enhances the alloy hardness and strength.

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Microstructure Refinement and Strengthening Mechanisms of a 9Cr Oxide Dispersion Strengthened Steel by Zirconium Addition

Cited by 58 publications

References 34 publications

EFFECT OF ULTRASONIC TREATMENT ON THE CONSOLIDATION OF ODS STEEL FeCrY2O3 PROCESSING WITH CAPSULATED SINTERING PROCESS.

EFFECT OF ULTRASONIC TREATMENT ON THE CONSOLIDATION OF ODS STEEL FeCrY2O3 PROCESSING WITH CAPSULATED SINTERING PROCESS.

ODS EUROFER Steel Strengthened by Y-(Ce, Hf, La, Sc, and Zr) Complex Oxides

The Effect of Zr Addition on Melting Temperature, Microstructure, Recrystallization and Mechanical Properties of a Cantor High Entropy Alloy

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