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Article Dans Une Revue Journal of Materials Engineering and Performance Année : 2022

Rapid Strengthening of Interstitial Free Steel Using Amorphous FeC Thin Films and Induction Heating

Résumé

A new process to rapidly obtain high strength interstitial free (IF) steel was investigated. Thin sheets of IF steel were coated on one or both sides with an amorphous FeC film and subjected to a two-step induction heating cycle (1100 ˚C followed by an isothermal hold at 780 ˚C for 2 or 4 minutes) and a rapid quench in water. Tensile mechanical properties were measured and a yield stress of 374 MPa and an ultimate tensile strength of 448 MPa were achieved after 2 minutes of induction heating. After 4 minutes of induction heating, the yield stress and the ultimate tensile strength drop at 206 MPa and 320 MPa respectively. During tensile testing, the specimens induction heated for 2 minutes show Lüdering, which is suppressed when the induction heating is extended to 4 minutes. Vickers microhardness measurements through thickness confirm that higher mechanical properties are obtained after 2 minutes of induction heating. Transmission electron microscopy reveals that strengthening results from dislocations, carbon in solid solution, and the precipitation of nanosized TiC particles. A fine microstructure with an average grain size of 15 μm is preserved after the induction heat treatment.
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Dates et versions

hal-03789547 , version 1 (27-09-2022)

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Elisa Cantergiani, Xavier Sauvage, Colin Scott, Arnaud Weck. Rapid Strengthening of Interstitial Free Steel Using Amorphous FeC Thin Films and Induction Heating. Journal of Materials Engineering and Performance, 2022, ⟨10.1007/s11665-022-06902-5⟩. ⟨hal-03789547⟩
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