Abstract：In order to investigate the direct quantitative relationship between mechanical property and polycrystal orientation of the micro zone of materials, the interstitial free (IF) steel was selected as an example to analyze the relationship between crystal orientation and nano-mechanical property. Firstly, high-temperature laser scanning confocal microscope (HLSM) was employed for the annealing treatment of IF steel samples to guarantee the validity of in-situ analysis. Then electron back scattering diffraction (EBSD) was used for crystal orientation analysis of targeted zone before and after annealing to obtain the in-situ change rule of crystal orientation. Finally the micro-mechanical property of targeted zone was tested by nanoindentor. The results showed that the Young′s modulus of the grains with different crystal orientations was different. The Young′s modulus value was relative high in <111> crystallographic direction with small interatomic distance, while the Young′s modulus value was low in <001> crystallographic direction with large interatomic distance. The testing results were verified by theoretical calculation. The hardness of grains with different crystal orientation had no obvious rules after annealing. However, the dislocation density in grains decreased significantly and the hardness decreased obviously compared to the cold-rolling state. The decreasing rate of hardness slowed down with the increase of annealing temperature.
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