Effect of the heating rate on the microstructure of a ferritic ODS steel with four oxide formers (Y-Ti-Al-Zr) consolidated by spark plasma sintering (SPS)

Maciá, Enrique; García-Junceda, Andrea; Serrano, Marta; Hernández‐Mayoral, M.; Díaz, Luis A.; Campos, Mónica

doi:10.1016/j.jnucmat.2019.02.043

Cited by 21 publications

(10 citation statements)

References 122 publications

(182 reference statements)

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“…The refinement of the microstructure may be probably due to the precipitation of a higher quantity of effective Zr nano-oxides acting as inhibitors of the grain size growth during recrystallisation. On the other hand, the increase of the heating rate during the SPS also has a clear effect on the final microstructure reached, leading to more regions of ultrafine grains for the same ODS composition, as previously reported by Macía et al [17] This may be caused by a higher heating rate leading to shorter times to homogeneously distribute the heat generated by the Joule effect through the powders, in physical contact inside the sintering die, producing as a result bigger grains in those regions in which the temperature reaches higher values.…”

Section: Microstructural Characterisation Of Sps Ods Alloyssupporting

confidence: 82%

“…On the other hand, the most common processing routes used to sinter ODS steels are hot extrusion (HE) and hot isostatic pressing (HIP). However, in the last years, field assisted sintering techniques (FAST), such as spark plasma sintering (SPS) and field-assisted hot pressing (FAHP), have been reported as promising processes to better tailor a suitable bimodal grain structure [16][17][18]. This grain size distribution is mainly composed of micrometric and nanometric grains.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Microstructural Characterisation Of Sps Ods Alloyssupporting

confidence: 82%

Section: Introductionmentioning

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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“…When the temperature is higher than 600 °C, the bonding ability of the grain boundaries decreases. It is considered that dislocations tend to accumulate near the oxides at the grain boundaries in ODS alloys, resulting in the rapid growth of voids and creep damage [ 30 , 31 ].…”

Section: Discussionmentioning

confidence: 99%

Effect of Hot Rolling on the Microstructure and Properties of Nanostructured 15Cr ODS Alloys with Al and Zr Addition

Chen

Zhang

et al. 2020

Materials

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Oxide dispersion strengthened (ODS) alloys with Al and Zr addition have excellent radiation tolerance, high-temperature strength, and corrosion resistance. The 15Cr-Al-Zr-ODS alloys are processed by mechanical alloying (MA), hot isostatic pressing (HIP), subsequent hot rolling to large strains of 70%, and further annealing. The effect of hot rolling on the microstructure, and the properties of nanostructured 15Cr ODS alloys with Al and Zr addition, were investigated. The microstructure after hot rolling and annealing showed obvious anisotropy. The cubic texture (φ1 = 0°, Φ = 0°, φ2 = 0°) {0 0 1} <1 0 0> and brass-R texture (φ1 = 0°, Φ = 55°, φ2 = 45°) {1 1 1} <1 1 0> were observed. The similar size distribution of precipitates was obtained for the comparison of the hot rolling samples with the hot isostatic pressed samples, which can be attributed to excellent thermal stability. After hot rolling, the alloy showed higher yield strength but did not lose too much plasticity.

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“…The amount of complex oxide (Y-Ti-Zr-O) was calculated and added to the ODS steels in order to keep the level of Zr at 0.6 wt% equivalent to previous results reported in [29,30].…”

Section: Odsmentioning

confidence: 99%

“…Subsequently, the milled ODS powders were put in into a 20 mm cylindrical graphite die and heated in vacuum (10 −2 -10 −3 mbar). A sintering temperature of 1100 • C was achieved and maintained for 5 min using a heating rate of 400 • C/min from room temperature (R.T.), a pressure of 80 MPa was applied in order to obtain samples without pores [29].…”

Section: Odsmentioning

confidence: 99%

Development of New 14 Cr ODS Steels by Using New Oxides Formers and B as an Inhibitor of the Grain Growth

Meza

Maciá

García-Junceda

et al. 2020

Metals

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In this work, new oxide dispersion strengthened (ODS) ferritic steels have been produced by powder metallurgy using an alternative processing route and characterized afterwards by comparing them with a base ODS steel with Y2O3 and Ti additions. Different alloying elements like boron (B), which is known as an inhibitor of grain growth obtained by pinning grain boundaries, and complex oxide compounds (Y-Ti-Zr-O) have been introduced to the 14Cr prealloyed powder by using mechanical alloying (MA) and were further consolidated by spark employing plasma sintering (SPS). Techniques such as x-ray diffraction (XRD), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM) were used to study the obtained microstructures. Micro-tensile tests and microhardness measurements were carried out at room temperature to analyze the mechanical properties of the differently developed microstructures, which was considered to result in a better strength in the ODS steels containing the complex oxide Y-Ti-Zr-O. In addition, small punch (SP) tests were performed to evaluate the response of the material under high temperatures conditions, under which promising mechanical properties were attained by the materials containing Y-Ti-Zr-O (14Al-X-ODS and 14Al-X-ODS-B) in comparison with the other commercial steel, GETMAT. The differences in mechanical strength can be attributed to the precipitate’s density, nature, size, and to the density of dislocations in each ODS steel.

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Effect of the heating rate on the microstructure of a ferritic ODS steel with four oxide formers (Y-Ti-Al-Zr) consolidated by spark plasma sintering (SPS)

Abstract: Todo lo que somos es el resultado de lo que hemos pensado Siddharta xi PUBLISHED AND SUBMITTED CONTENT Publications 1."Effect of the heating rate on the microstructure of a ferritic ODS steel group four (Y-Ti-Al-Zr) consolidated by Spark Plasma Sintering (SPS)" E.

Cited by 21 publications

References 122 publications

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

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

Effect of Hot Rolling on the Microstructure and Properties of Nanostructured 15Cr ODS Alloys with Al and Zr Addition

Development of New 14 Cr ODS Steels by Using New Oxides Formers and B as an Inhibitor of the Grain Growth

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