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Abstract:

The morphologyof G20Mn5 specimensmade of non-modified and rare earth metals (REM)modified cast steelwas investigated. Molten metal was treated with a cerium-richmischmetal contain49.8% Ce, 21.8% La, 17.1% Nd, 5.5% Pr and 5.35% other rare earth metals making up the balance. The melting, quenching (920°C/water) and tempering (720°C/air) were performed under industrial conditions. Analysis included G20Mn5 cast steel fracture specimens subjected to Charpy V-notch impact testing at 20°C, -30°C and -40°C. The purpose of the analysis was to determine the influence of REM on the microstructure and mechanical properties of G20Mn5 cast steeland the REM effect on themorphology,impact strengthand character of the fracture surfaces. In addition, a description of the mechanism by which fracture occurred in the two materials wasproposed.The author demonstrated the beneficial effects of adding REM to moltensteel,manifested by a20 -40%increase in impact toughness, depending on test temperature,as compared to the non-modified cast steel. Important findings included more than 100% increase in impact strength in comparison with the required impact toughness of 27J at -40C for heat treated steels(EN 10213).

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The Morphology of Impact Fracture Surfaces in Manganese Cast Steel Modified by Rare Earth Elements