Effect of Si Content on Phase Transition Temperature, Microstructure and Hardness in Medium Mn Steel
Abstract
Medium Mn steels (C = 0.15–0.19 wt.%, Mn = 5.00–5.20 wt.%) with variation of Si content (1.9, 2.45, 3.4 wt.%) were prepared using vacuum induction melting furnace. The cast billets were forged and cooled to room temperature in air. Microstructural investigation of the forged alloys showed fully martensitic structure along with minor content of retained austenite. With Si content, the hardness of forged steel were found to be increasing. The transition temperatures (Ac1, Ac3, Ms, and Mf) were determined using differential scanning calorimetry (DSC) measurements. Increase of Si content raised Ac1 and Ac3 and caused reduction in Ms and Mf. The forged samples were austenized at 900 °C for 15 min, followed by isothermal holding at 700 °C for 1 and 4 h and water quenched. The microstructure consisted of ferrite, martensite, and retained austenite. Microhardness measurements of heat-treated steels also showed significant enhancement of mechanical strength with increase of Si content.
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References
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