SEARCH

SEARCH BY CITATION

Keywords:

  • micro-alloyed;
  • vanadium;
  • strain induced precipitates;
  • ferrite

The evolution of strain-induced V precipitates at two different temperatures (600 and 700°C) in ferrite was studied via atom probe tomography and transmission electron microscopy. The interpretation of experimental results is supported by simulation data, which was calculated by means of MatCalc. The study reveals that V carbonitrides are formed independently from the formation temperature. Initially, the precipitates have a higher N content than C. With longer dwell times, the C to N ratio changes from N- to C-rich V carbonitrides. At 700°C formation temperature, the growth of precipitates and the change from higher N to higher C occurs faster than at 600°C. Due to the faster growth, the V content in solid solution decreases earlier. The precipitates exhibit an elliptical shape and have NaCl type f.c.c structure. A [012]α//[011]V(C, N) and a [001]α//[011]V(C, N) orientation relationship with the ferrite matrix were detected.