Distribution of carbide particles and its influence on grain growth of ferrite in Fe-C alloys containing B and V

摘要

The pinning effects of carbide particles on the grain growth of ferrite were studied in Fe-0.1C-0.0005B and Fe-0.1C-0.09V alloys. The number and size distribution of carbide particles were determined from the number of consecutive sections cutting a particle or the observed largest size in distinction of grain faces, edges and corners by means of serial sectioning. The particle numbers in contact with each type of grain boundary site were considerably greater than those calculated assuming random distribution. Theories that all particles pin grain boundaries predicted the final grain size in fair agreement with measured ones.