GRAIN SIZE EFFECT ON THE TENSILE BEHAVIOR OF A FeMnC TW1P STEEL IN RELATION WITH THE MICROSTRUCTURE AND TEXTURE EVOLUTIONS

摘要

The influence of the grain size in a high manganese austenitic TWIP (Twinning Induced Plasticity) steel has been investigated on samples deformed in tension. The twinning activity varies with the grain size and influences the mechanical behavior. In the earlier stage of deformation, mechanical twinning is favored in the small grain-sized steel, resulting in a higher hardening rate. For high deformation levels, the large grain-sized steel exhibits a higher twin volume fraction. This reduces its texture sharpness and maintains a high strain hardening rate.