The Influence of Specimen Geometry and Strain Rate on the Portevin-Le Chatelier Effect and Fracture in an Austenitic FeMnC TWIP Steel

Kang, Jidong; Shi, Liting; Liang, Jie; Amirkhiz, Babak Shalchi; Scott, Colin

doi:10.3390/met10091201

Cited by 5 publications

(1 citation statement)

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“…The addition of carbon was found to have a beneficial effect on the mechanical properties by decreasing the grain size [27,47], increasing the friction and/or back stress associated with interstitial carbon or carbides [27], and enhancing the stability of deformation twins [27,46]. Two types of carbide, M 23 C 6 and M 7 C 3 carbide particles, were observed in (NiCo) 75 Cr 17 Fe 8 C 0.34 and (NiCo) 75 Cr 17 Fe 8 C 0.83 as exhibited in Figures 4 and 5.…”

Section: Estimation Of Carbon Partitioning Into Carbides and Interstimentioning

confidence: 99%

Mechanical Performance and Microstructural Evolution of (NiCo)75Cr17Fe8Cx (x = 0~0.83) Medium Entropy Alloys at Room and Cryogenic Temperatures

Song

Lee

Moon

et al. 2020

Metals

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We investigated the effects of the addition of Co and carbon on the deformation behavior of new medium-entropy alloys (MEAs) designed by increasing the entropy of the conventional NiCrFe-type Alloy 600. The strength/ductility combination of carbon-free (NiCo)75Cr17Fe8 MEA was found to be 729 MPa/81% at 298 K and it increased to a remarkable 1212 MPa/106% at 77 K. The excellent strength and ductility of (NiCo)75Cr17Fe8 at cryogenic temperature is attributed to the increased strain hardening rate caused by the interaction between dislocation slip and deformation twins. Strength/ductility combinations of carbon-doped (NiCo)75Cr17Fe8C0.34 and (NiCo)75Cr17Fe8C0.83 at cryogenic temperature were observed to be 1321 MPa/96% and 1398 MPa/66%, respectively, both of which are superior to those of other high-entropy alloys (HEAs). Strength/ductility combinations of (NiCo)75Cr17Fe8C0.34 and (NiCo)75Cr17Fe8C0.83 at room temperature were found to be 831 MPa/72% and 942 MPa/55%, respectively and both are far superior to 676 MPa/41% of the commercial Alloy 600. Yield strengths of carbon-free and carbon-doped alloys comprised strengthening components from the friction stress, grain size strengthening, carbide strengthening and interstitial strengthening and excellent agreement between the predictions and the experiments was obtained. A design strategy to develop new MEAs by increasing the entropy of the conventional alloys was found to be effective in enhancing the mechanical performance.

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