Abstract
Using MTS-Landmark material testing machine, Quanta-650 scanning electronic microscopy and Leica-LM/DM optical properties microscope, the mechanical properties and meso-damage evolution behavior of AISI304 steel at different annealing temperatures were studied. The results showed that the grain of AISI 304 steel grew up with increasing annealing temperature, and annealing twins appeared during the grain growth. The yield strength, tensile strength and micro-hardness of the samples decreased gradually with increasing annealing temperature. Based on the evolution characteristics of austenite grain boundaries, evolution of shape factor of the samples was researched at different plastic strains. Meso-damage evolution equations of the materials were established, and the material constant in the equation were closely related to the annealing temperatures. Normalized shape factor can reflect meso-damage evolution behavior of AISI 304 steel, which simply and effectively revealed the relation between marco deformation and microstructure.
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