Preparation of high performance bulk Fe–N alloy by spark plasma sintering

Cui, Guodong; Wei, Xialu; Olevsky, Eugene A.; German, Randall M.; Chen, Junying

doi:10.1016/j.matdes.2015.10.122

Cited by 20 publications

(8 citation statements)

References 49 publications

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“…Spark plasma sintering (SPS) has been recognized as one of the most attractive rapid powder consolidation technologies to obtain high‐density and fine grain products . SPS can significantly shorten the processing of powder materials and improves the powder consolidation performance in terms of both time and quality.…”

Section: Introductionmentioning

confidence: 99%

Effect of heating rate on properties of transparent aluminum oxynitride sintered by spark plasma sintering

et al. 2018

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High heating rates ranging from 50 to 250°C/min are selected to rapidly sinter transparent aluminum oxynitride (AlON) ceramics by spark plasma sintering (SPS) at 1600°C under 60 MPa using a bimodal AlON powder synthesized by the carbothermal reduction and nitridation method. With 1 minute holding time before cooling, all the specimens show high density and high transparence. The maximum transmittance is up to 74.5%-80.6%, where the maximum transmittance is positively correlated with the heating rate. Further analysis reveals that faster heating rates enable the decrease in the amount of the AlON phase decomposed into the α-Al 2 O 3 and AlN phases during heating. These α-Al 2 O 3 and AlN phases have to be converted back to AlON at the final stage of sintering, which indicates that a decrease in the amount of the α-Al 2 O 3 and AlN phases via the boosted heating leads to the higher transmittance of the AlON ceramics. The high heating rates and short holding duration of the SPS utilized in this study result in the fine grain size of the obtained ceramics (1-6 μm) compared to that of the AlON ceramics fabricated by the conventional sintering method. This effect of high heating rates is confirmed by the coupled densification-grain growth modeling. In turn, the obtained AlON specimens exhibit a Vickers hardness of 15.87-16.62 GPa. K E Y W O R D S aluminum oxynitride, phase transformation, rapid rate heating, spark plasma sintering, transparent ceramics

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Section: Introductionmentioning

confidence: 99%

Effect of heating rate on properties of transparent aluminum oxynitride sintered by spark plasma sintering

et al. 2018

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“…[16][17][18] In addition, high heating rates of SPS are also helpful for obtaining high density and finegrained products. 19,20 Therefore, SPS-processed specimens usually possess smaller grains compared to their conventionally sintered counterparts as the grain growth is both temperature and time dependent.…”

Section: Introductionmentioning

confidence: 99%

Highly infrared transparent spark plasma sintered AlON ceramics

et al. 2017

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“…It is noted that, according to our previous works, the N content in these specimens is determined to be extremely low (near zero), as the decomposition of iron nitride at high sintering and carburization temperature makes nitrogen atoms escape from the sample in the form of nitrogen . Table reports the porosity and compressive properties of three groups of specimens.…”

Section: Resultsmentioning

confidence: 92%

“…The rapid heating speed and short isothermal holding time, resulting pores between Fe–N powders could not timely close and be eliminated totally, account for this low degree of densification at the sintering temperature in single α ‐phase field. Moreover, the Fe–N phase transformation also contributed to high porosity of porous iron, since the iron nitride decomposed and released nitrogen . Such gas is conducive to the formation of ultra‐fine porous microstructure and enables the pores to remain stably with its pressure retaining in the closed cells.…”

Section: Resultsmentioning

confidence: 99%

Surface Martensite Strengthening of Ultra‐fine Porous Iron

Cui

Jiang

et al. 2017

steel research int.

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The surface martensite strengthening of ultra-fine isotropic porous iron has been performed via carburization and quenching treatment at 950 C for 30 min. This paper is devoted to investigating the evolution of microstructure and related mechanical behavior of porous iron after carburization treatment. Results indicate that an effective carburization thickness (300 mm) contributes to a substantial improvement in compressive ductility (62%) and surface hardness (219 HV 0.025 ) of carburized porous iron. Further, the quenching treatment after carburization produces the porous iron with an ultra-fine martensite microstructure on surface layer that makes porous iron attain the highest yield strength (256 MPa) and energy absorption capacity (85 KJ kg À1 ). The major contribution of this present work is a demonstration that an improvement in mechanical properties of ultra-fine porous iron can be achieved through the carburization and quenching treatment to control the phase structure on surface. Thus, the surface martensite strengthening is considered as a feasible method to prepare more valuable porous iron based alloys, and to provide them with more promising applications on key structural parts.

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Preparation of high performance bulk Fe–N alloy by spark plasma sintering

Cited by 20 publications

References 49 publications

Effect of heating rate on properties of transparent aluminum oxynitride sintered by spark plasma sintering

Effect of heating rate on properties of transparent aluminum oxynitride sintered by spark plasma sintering

Highly infrared transparent spark plasma sintered AlON ceramics

Surface Martensite Strengthening of Ultra‐fine Porous Iron

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