Microstructure and Mechanical Properties in Warm Forged 27MnSiVS6 Microalloyed Steel
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The mechanical properties and microstructure of warm forged 27MnSiVS6 steel was evaluated at temperatures between 850 and 760 °C. The strength values showed enhancement by about 50 MPa, while the impact toughness was almost doubled. The microstructure showed increase in ferrite content with decreasing warm forging temperature, and the ferritic grains showed finer grain structure. While the increased ferrite content resulted in limiting the strength enhancement, the fineness of the grain structure led to a significant enhancement in impact toughness. The ductile-to-brittle transition temperature was pushed to a significantly low temperature in the warm forged steel compared to the hot-rolled steel. The microstructure evolution at various stages of processing was brought out.
KeywordsMicro alloyed steel Warm forging temperature deformation Toughness Fine grains
The authors wish to thank Ms. V Madhuri for the SEM support and the colleagues in QAD for the support in steel characterization.
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