Study and Suppression of the Microstructural Anisotropy Generated During the Consolidation of a Carbonyl Iron Powder by Field-Assisted Hot Pressing

García-Junceda, Andrea; Acebo, Laura; Torralba, J. M.

doi:10.1007/s11661-015-2919-z

Cited by 14 publications

(9 citation statements)

References 24 publications

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“…Aluminum carbides were not found in the matrix of the 14Cr‐ODS‐Zr material, since the carbon content of the MA powder was insignificant (Table ). It is worth mentioning that the small quantity of aluminum carbides within the matrix of the 14Cr‐ODS and their absence in the 14Cr‐ODS‐Zr, confirm that interposing a tungsten foil between die/powder and punch/powder is a successful way to avoid the diffusion of carbon (coming from the graphite tools) along the ferritic matrix during the consolidation process by FAHP, as reported in a previous investigation . Moreover, it is possible to conclude that the zirconia addition has decreased the quantity of the aluminum nano‐oxides, promoting the existence of finer zirconium nano‐oxides randomly distributed in the matrix.…”

Section: Resultssupporting

confidence: 76%

“…Once the degassing temperature was overcome (at 600°C), the pressure was increased to 50 MPa and maintained up to cooling. In order to avoid the attachment of the consolidated alloy to the die/punches and to suppress a potential carbon contamination coming from the graphite die and punches, a high‐purity (>99.97%) tungsten foil (25 μm thick) was used during the sintering process . The consolidated ODS samples were cylindrical specimens with 9.95 mm in diameter and 6 mm in length.…”

Section: Methodsmentioning

confidence: 99%

“…It is worth mentioning that the small quantity of aluminum carbides within the matrix of the 14Cr-ODS and their absence in the 14Cr-ODS-Zr, confirm that interposing a tungsten foil between die/powder and punch/powder is a successful way to avoid the diffusion of carbon (coming from the graphite tools) along the ferritic matrix during the consolidation process by FAHP, as reported in a previous investigation. 11 Moreover, it is possible to conclude that the zirconia addition has decreased the quantity of the aluminum nano-oxides, promoting the existence of finer zirconium nano-oxides randomly distributed in the matrix. Regarding the mechanical properties of the consolidated samples, the 14Cr-ODS-Zr presented a slightly higher hardness (420 AE 33) compared to the 14Cr-ODS (376 AE 40).…”

Section: (2) Microstructural and Mechanical Characterization Of Consomentioning

confidence: 98%

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Effect of Zirconium on the Microstructure and Mechanical Properties of an Al‐Alloyed ODS Steel Consolidated by FAHP

et al. 2015

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An oxide dispersion strengthened (ODS) ferritic steel with nominal composition Fe-14Cr-5Al-3W-0.4Ti-0.25Y 2 O 3 -0.6ZrO 2 was produced by mechanical alloying (MA), based on a prealloyed grade Fe-14Cr-5Al-3W steel with the addition of Ti element, Y 2 O 3 and ZrO 2 , and subsequent consolidation by means of field assisted hot pressing (FAHP). The microstructure and the mechanical properties were analyzed and compared with a reference material with nominal composition Fe-14Cr-5Al-3W-0.4Ti-0.25Y 2 O 3 . The addition of zirconia increased the volume fraction of the smallest and equiaxed ferritic nano-grains and decreased the quantity of larger aluminum nano-oxides within the ferritic matrix, promoting the formation of fine zirconium nano-oxides and leading to the enhancement of the mechanical properties of the alloy.

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Section: Resultssupporting

confidence: 76%

Section: Methodsmentioning

confidence: 99%

Section: (2) Microstructural and Mechanical Characterization Of Consomentioning

confidence: 98%

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Effect of Zirconium on the Microstructure and Mechanical Properties of an Al‐Alloyed ODS Steel Consolidated by FAHP

et al. 2015

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“…The dwelling time was 5 min with a compacting pressure of 80 MPa. A high purity tungsten foil (25 µm thick) was used in order to avoid a potential carbon contamination coming from the graphite tools [24,25].…”

Section: Sample Id Composition Zr Contentmentioning

confidence: 99%

Effect of Small Variations in Zr Content on the Microstructure and Properties of Ferritic ODS Steels Consolidated by SPS

García-Junceda

Maciá

Garbiec

et al. 2020

Metals

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Two different zirconium contents (0.45 and 0.60 wt.%) have been incorporated into a Fe-14Cr-5Al-3W-0.4Ti-0.25Y2O3 oxide dispersion-strengthened (ODS) steel in order to evaluate their effect on the final microstructure and mechanical properties. The powders with the targeted compositions were obtained by mechanical alloying (MA), and subsequently processed by spark plasma sintering (SPS) at two different heating rates: 100 and 400 °C·min−1. Non-textured bimodal microstructures composed of micrometric and ultrafine grains were obtained. The increase in Zr content led to a higher percentage of Zr nano-oxides and larger regions of ultrafine grains. These ultrafine grains also seem to be promoted by higher heating rates. The effective pinning of the dislocations by the Zr dispersoids, and the refining of the microstructure, have significantly increased the strength exhibited by the ODS steels during the small punch tests, even at high temperatures (500 °C).

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“…In this work, argon gas was utilized and to be ionized. 30 The microwave energy was set within a range between 0.1 and 3 kW. The microwave energy source creates a plasma inside the quartz tube, which serves as a dielectric.…”

Section: Microwave Sinteringmentioning

confidence: 99%

Sintering metal injection molding parts of tungsten-based steel using microwave and conventional heating methods

Chinnathaypgal

Desai

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part B:

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In recent years, the near net shape metal injection molding process combines desirable features of plastic injection molding and powder metallurgy processes to gain high strength-to-weight ratio for manufacturing complex-shaped parts. The metal injection molding process consists of mixing, molding, debinding, and sintering. Microwave processing has attracted much attention in global research because of its unique features such as its ability to heat and sinter a wide variety of metals and its significant advantages in energy efficiency, processing speed, and compatibility. Also, it presents few environmental risks and can produce refined microstructures. The injected samples to be sintered are composed of fine tool steel metal powder and binders, stearic acid, paraffin wax, low-density polyethylene, and polyethylene glycol (600). In recent years, microwave-assisted post-treatment is considered a novel method for processing green parts. In this work, the green parts are subjected to high-intensity microwave fields which operate at a frequency of 2.45 GHz. Metal injection molding compacts were sintered using multi-mode microwave radiation. The sintering of a metal injection molding compact by microwaves has hardly been reported. The metal injection molding compact showed better results than those produced by sintering with conventional heating. This study evaluates the effect of conventional sintering and microwave sintering on mechanical properties. By optimizing the sintering process, increased sintered hardness, a more homogeneous microstructure, and greater shrinkage were obtained using microwave-assisted sintering.

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Study and Suppression of the Microstructural Anisotropy Generated During the Consolidation of a Carbonyl Iron Powder by Field-Assisted Hot Pressing

Cited by 14 publications

References 24 publications

Effect of Zirconium on the Microstructure and Mechanical Properties of an Al‐Alloyed ODS Steel Consolidated by FAHP

Effect of Zirconium on the Microstructure and Mechanical Properties of an Al‐Alloyed ODS Steel Consolidated by FAHP

Effect of Small Variations in Zr Content on the Microstructure and Properties of Ferritic ODS Steels Consolidated by SPS

Sintering metal injection molding parts of tungsten-based steel using microwave and conventional heating methods

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