A sharp interface model for the morphological evolution of precipitates in Al cast alloys§

Emmerich, Heike; Siquieri, R.; Jurgk, Matthias; Rezende, João Luiz Lopes; Hubert, J.

doi:10.1080/09500830701584092

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…[20][21][22] Also, EMS applied to the solidification of metals led to the refinement and better distribution of precipitates. 23,24) Moreover, EMS was used to eliminate the segregation of solute elements in ingots. 25,26) In this paper, we report on the microstructural characterization of cobalt added high chromium steel and the evaluation of its elevated-temperature strength to provide fundamental information regarding its potential application to heat-resistant steel.…”

Section: Introductionmentioning

confidence: 99%

Size and Type of Inclusions in Fe–Cr–Co Heat–resistant Steel and Elevated-temperature Strength under the Effect of Electromagnetic Stirring

Zhang

Hou

et al. 2019

ISIJ Int.

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We fabricated the Fe-18Cr-2Ni-1Mo-0.2C-0.2Mn-0.1Si heat-resistant steels containing 3 to 12% Co by casting in the presence of a rotary electromagnetic stirring (EMS). The effect of EMS on the Fe-Cr-Co steels was evaluated by the size and type of inclusions and the examination of mechanical properties. The morphology and composition of inclusions were observed, and the formation mechanism of the inclusions was analyzed through thermodynamic calculation using Thermo-Calc. The results showed that there were mainly two types of inclusions generated in the solidification process, including the Al 2 O 3 corundum and the MnO. Cr 2 O 3 spinel. The application of EMS during solidification has shown a significant effect on the exclusion of large inclusions. Both the number density and the size of inclusions decreased under the effect of EMS. The mechanical properties at elevated temperatures were investigated considering the effect of cobalt addition and EMS. The strength of the steel increased with increasing cobalt content. At 800°C, an increase in cobalt from 3 to 12% resulted in a substantial strength increase concomitant with an increase in elongation rate. EMS reduced the ultimate tensile strength but enhanced the ductility of the steels. These effects were discussed relating to an early suppression of the δ-ferrite formation and the exclusion of large inclusions.

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Section: Introductionmentioning

confidence: 99%

Size and Type of Inclusions in Fe–Cr–Co Heat–resistant Steel and Elevated-temperature Strength under the Effect of Electromagnetic Stirring

Zhang

Hou

et al. 2019

ISIJ Int.

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“…Moreover, EMS was used to eliminate the micro- and macrosegregation of solute elements in ingots [ 26 , 27 ]. Also, the EMS applied to the solidification of metals led to the refinement and better distribution of precipitates [ 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Electromagnetic Stirring on the Microstructure and Properties of Fe-Cr-Co Steel

et al. 2018

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High chromium steel has been synthesized by an induction furnace adopting electromagnetic stirring (EMS). Varying amounts of cobalt was added to obtain 3, 6, and 12% Co in the steel. The melt was allowed to solidify with or without EMS in a rotary magnetic field. The effects of the varying cobalt content and the stirring have been characterized by the microstructural evolution and the consequent improvement in mechanical properties. The application of a rotary EMS during solidification has shown a significant effect on the grain refining, the reduction of element segregation, the promotion of eutectic volume fraction, and the consequent improvement of mechanical properties, including hardness and high-temperature strength. The formation mechanism of the eutectic structure and the precipitation of M7C3 and M23C6 carbides was discussed according to the calculated phase diagram. The increment of cobalt content improved the eutectic volume fraction. Cobalt addition also enhanced the hardness and the yield tensile strength, provided that the ingot structure was homogenized by the EMS.

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The Effect of Electromagnetic Stirring on the Microstructure Evolution of Cu-15%Co Alloy

Zhang

Wang

et al. 2018

Metals

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Cu-15%Co alloys have been synthesized by an induction furnace adopting electromagnetic stirring (EMS). The liquid-liquid separation behavior and the peritectic reaction under a forced melt flow were analyzed. The specimens were subjected to a conventional induction melting as well as enhanced melt stirring by a two-side electromagnetic stirrer. The stirred ingots showed a significant improvement in dispersivity and homogeneity of the Co-rich phase. Comparing the specimens subjected to different current intensities, we observed strong changes in the phase fraction, the degree of segregation, and the grain size. EMS had an effect of reducing the amount and size of Co-rich droplets and enhancing the amounts of small equiaxed dendrites and dendrite fragments, which led to a more dispersive distribution of α-Co phase and refined the grains of Cu-rich phase. We observed a considerable increase in the fraction of peritectic Cu-rich phase with increasing current intensity of EMS, indicating that the peritectic reaction was promoted by EMS. EMS also reduced the macrosegregation of Co-rich phase in both the vertical and radial direction of the ingot when the current intensity was appropriate.

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A sharp interface model for the morphological evolution of precipitates in Al cast alloys§

Cited by 3 publications

References 11 publications

Size and Type of Inclusions in Fe–Cr–Co Heat–resistant Steel and Elevated-temperature Strength under the Effect of Electromagnetic Stirring

Size and Type of Inclusions in Fe–Cr–Co Heat–resistant Steel and Elevated-temperature Strength under the Effect of Electromagnetic Stirring

Effect of Electromagnetic Stirring on the Microstructure and Properties of Fe-Cr-Co Steel

The Effect of Electromagnetic Stirring on the Microstructure Evolution of Cu-15%Co Alloy

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