ANALYSIS OF HEAT TREATMENT EFFECT ON MICROSTRUCTURAL FEATURES EVOLUTION IN A MICRO-ALLOYED MARTENSITIC STEEL

Andrea Di Schino

Abstract


The microstructural evolution of a quenched and tempered medium-C micro-alloyed steel during tempering is analyzed The steel was heat treated in order to develop fully martensitic microstructures after quenching with different prior austenite grain sizes (AGS).

Main results can be summarized as below:

  • A very poor effect of AGS on packet size is found.
  • High-angle boundary grains do not significantly grow after tempering; on the contrary, low-angle grain boundaries (cells) move, fully justifying the hardness evolution with tempering temperature. 

Keywords


martensite; microstructure; packets; cells; tempering

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References


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DOI: http://dx.doi.org/10.12776/ams.v22i4.815

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