Strong Yet Ductile Medium Mn Steel Developed by Partial Austenitization

Lu, Yao; Liu, Li; Meng, Jinkui; Chen, Zhe; Zhang, Liang

doi:10.1007/s11661-022-06841-9

Cited by 5 publications

(1 citation statement)

References 36 publications

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“…In contrast to sample S-1, the stress-strain curve of sample S-2 exhibits a concave shape up to a strain of approx. 20%, i.e., indicating conventional dislocation glide as the primary deformation mode in this sample in that strain regime 60,61 . The work-hardening rate in this sample nevertheless remains high over a large strain range, and at higher strains a transition to a convex appearance is also seen (though it cannot be ruled out that this is related to a break-down of lubrication conditions during compression loading).…”

Section: Resultsmentioning

confidence: 74%

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: Resultsmentioning

confidence: 74%