Effect of initial microstructure on graphitization behavior of Fe–0.55C–2.3Si steel

Kim, Ye Jin; Park, Sung Hyuk

doi:10.1016/j.jmrt.2021.10.071

Cited by 6 publications

(1 citation statement)

References 44 publications

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“…In the S-5 composites and S-6 composites, additional free silicon in excess of that taken up by the formation of silicide is present. This free Si was found to promote graphitization, as observed also in conventional steels 58 .…”

Section: Resultssupporting

confidence: 65%

Ceramic-reinforced HEA matrix composites exhibiting an excellent combination of mechanical properties

Mehmood

Shehzad

Mujahid

et al. 2022

Sci Rep

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CoCrFeNi is a well-studied face centered cubic (fcc) high entropy alloy (HEA) that exhibits excellent ductility but only limited strength. The present study focusses on improving the strength-ductility balance of this HEA by addition of varying amounts of SiC using an arc melting route. Chromium present in the base HEA is found to result in decomposition of SiC during melting. Consequently, interaction of free carbon with chromium results in the in-situ formation of chromium carbide, while free silicon remains in solution in the base HEA and/or interacts with the constituent elements of the base HEA to form silicides. The changes in microstructural phases with increasing amount of SiC are found to follow the sequence: fcc → fcc + eutectic → fcc + chromium carbide platelets → fcc + chromium carbide platelets + silicides → fcc + chromium carbide platelets + silicides + graphite globules/flakes. In comparison to both conventional and high entropy alloys, the resulting composites were found to exhibit a very wide range of mechanical properties (yield strength from 277 MPa with more than 60% elongation to 2522 MPa with 6% elongation). Some of the developed high entropy composites showed an outstanding combination of mechanical properties (yield strength 1200 MPa with 37% elongation) and occupied previously unattainable regions in a yield strength versus elongation map. In addition to their significant elongation, the hardness and yield strength of the HEA composites are found to lie in the same range as those of bulk metallic glasses. It is therefore believed that development of high entropy composites can help in obtaining outstanding combinations of mechanical properties for advanced structural applications.

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Section: Resultssupporting

confidence: 65%

Ceramic-reinforced HEA matrix composites exhibiting an excellent combination of mechanical properties

Mehmood

Shehzad

Mujahid

et al. 2022

Sci Rep

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Effect of Rare Earth Ce on Structure and Properties in 7CrSiMnMoV Die Steel Castings

Long,

Li,

Zeng

et al. 2024

steel research int.

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In this study, rare earth (RE) Ce is used to modify the interaction between atoms in 7CrSiMnMoV die steel castings. The tensile properties are performed, and strengthening mechanism are analyzed by investigated fracture surface, and microstructure by optical microscopy (OM) and scanning electron microscope‐energy dispersive spectrometer (SEM‐EDS). And ab initio molecular dynamics (AIMD) is used to simulate the effect of the Ce element on the local atomic structure of the FeCeC system alloy steel. The results indicate the strength can increase from 722.55 to 1074.27 MPa, and the elongation can increase from 24.86% to 44.22% with a RE Ce concentration of 0.009%. It is attributed to that doping of Ce can inhibit the formation of network eutectic cementite, refine the lamellar spacing of pearlite, and even form granular cementite and martensite structures. AIMD simulation results show that C atoms tend to be surrounded by Fe, and the strong chemical bonds of FeC make the Fe‐centered C more stable with an increase in RE Ce concentration. And doping Ce can introduce new local topological and chemical orderings such that the FeCFe triplets predominantly form small and big angles shifting from near 75° and 136° to 47° and 81°, respectively.

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Formation of Ultrafine Graphite Nodules in Ductile Iron and its Effects on Mechanical Properties

Liu,

Du,

et al. 2023

J. of Materi Eng and Perform

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Effect of initial microstructure on graphitization behavior of Fe–0.55C–2.3Si steel

Cited by 6 publications

References 44 publications

Ceramic-reinforced HEA matrix composites exhibiting an excellent combination of mechanical properties

Ceramic-reinforced HEA matrix composites exhibiting an excellent combination of mechanical properties

Effect of Rare Earth Ce on Structure and Properties in 7CrSiMnMoV Die Steel Castings

Formation of Ultrafine Graphite Nodules in Ductile Iron and its Effects on Mechanical Properties

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