Ferritic oxide dispersion strengthened alloys by spark plasma sintering

Allahar, Kerry N.; Burns, Jatuporn; Jaques, Brian J.; Wu, Yaqiao; Charit, Indrajit; Cole, James I.; Butt, Darryl P.

doi:10.1016/j.jnucmat.2013.07.019

Cited by 26 publications

(15 citation statements)

References 27 publications

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“…Fine Y-Zr-O complex oxide on the aluminum free ferritic steel (sample 1) enhanced hardness and strength by the dispersion strengthening effect, which was reported several researchers [39]. Aluminum free (Sample 1) 16.5 Cr ferritic steel has 14% higher hardness than the aluminum containing (Sample 2) ferritic steel at the pressure level of 60MPa [40].…”

Section: G Dharmalingam R Mariappan and M Arun Prasadsupporting

confidence: 55%

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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Section: G Dharmalingam R Mariappan and M Arun Prasadsupporting

confidence: 55%

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

Dharmalingam¹,

Tjprc²

2018

IJMPERD

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“…The reason for the bimodal grain size distribution was likely due to heterogeneous plastic deformation and dissolution of Y2O3 in Ni-20Cr matrix after milling for 4 h. Because the heterogeneity in Ni-20Cr powder particles incorporated by longer milling hours from one hand and alteration in chemical compositions from one particle to another particle or from inside to outside of a particle in another hand could initiate the bimodal grain structure [25]. More distinct bimodal grain size distribution has already been reported for the ironbased ODS alloys and was attributed to heterogeneity developed in the microstructure due to long hours of milling and subsequent sintering process [17,32,33].…”

Section: Microstructural Evolutionmentioning

confidence: 99%

“…The numbers of thermal processing steps could be eliminated if a pulsed direct current (DC) is simultaneously used with a uniaxial pressure to primarily sinter the powders [17,18]. This could reduce the time, cost and possibly deformation texture in the consolidated materials [19].…”

Section: Introductionmentioning

confidence: 99%

Oxide dispersion strengthened nickel based alloys via spark plasma sintering

Pasebani

Dutt

Burns

et al. 2015

Materials Science and Engineering: A

Self Cite

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Oxide dispersion strengthened (ODS) nickel based alloys were developed via mechanical milling and spark plasma sintering (SPS) of Ni-20Cr powder with additional dispersion of 1.2 wt.% Y 2 O 3 powder. Furthermore, 5 wt.% Al 2 O 3 was added to Ni-20Cr-1.2Y 2 O 3 to provide composite strengthening in the ODS alloy. The effects of milling times, sintering temperature, and sintering dwell time were investigated on both mechanical properties and microstructural evolution. A high number of annealing twins was observed in the sintered microstructure for all the milling times.However, longer milling time contributed to improved hardness and narrower twin width in the consolidated alloys. Higher sintering temperature led to higher fraction of recrystallized grains, improved density and hardness. Adding 1.2 wt.% Y 2 O 3 to Ni-20Cr matrix significantly reduced the grain size due to dispersion strengthening effect of Y 2 O 3 particles in controlling the grain boundary mobility and recrystallization phenomena. The strengthening mechanisms at room temperature were quantified based on both experimental and analytical calculations with a good agreement. A high compression yield stress obtained at 800 °C for Ni-20Cr-1.2Y 2 O 3 -5Al 2 O 3 alloy was attributed to a combined effect of dispersion and composite strengthening.

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“…The ball milled powder was consolidated using a Dr. Sinter 1500 Spark Plasma Sintering (SPS) System at temperature of 1000°C for 30 min. More details about high energy ball milling and SPS process are given in our recent paper [19].…”

Section: Methodsmentioning

confidence: 99%

Fe‐Cr‐Mo based ODS alloys via spark plasma sintering: A combinational characterization study by TEM and APT

Allahar

Burns

et al. 2013

Crystal Research and Technology

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Nanoscale oxides play an important role in oxide dispersion strengthened (ODS) alloys for improved high temperature creep resistance and enhanced radiation damage tolerance. In this study, transmission electron microscopy (TEM) and atom probe tomography (APT) were combined to investigate two novel Fe-16Cr-3Mo (wt.%) based ODS alloys. Spark plasma sintering (SPS) was used to consolidate the ODS alloys from powders that were milled with 0.5 wt.% Y 2 O 3 powder only or with Y 2 O 3 powder and 1 wt.% Ti. TEM characterization revealed that both alloys have a bimodal structure of nanometer-size (ß 100 -500 nm) and micronsize grains with nanostructured oxide precipitates formed along and close to grain boundaries with diameters ranging from five to tens of nanometers. APT provides further quantitative analyses of the oxide precipitates, and also reveals Mo segregation at grain boundaries next to oxide precipitates. The alloys with and without Ti are compared based on their microstructures.

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Ferritic oxide dispersion strengthened alloys by spark plasma sintering

Cited by 26 publications

References 27 publications

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

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

Oxide dispersion strengthened nickel based alloys via spark plasma sintering

Fe‐Cr‐Mo based ODS alloys via spark plasma sintering: A combinational characterization study by TEM and APT

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