The relationship between the deformation temperature and the amount of deformation and the hardness of the wear-resistant steel tube after recrystallization annealing was studied by electron backscatter diffraction, hardness test, tensile test and scanning electron microscope analysis. Combining with metallographic and scanning electron microscopy, The effect of deformation degree on the homogenization process, microstructure homogeneity, recrystallization and properties of alloying elements in wear-resistant steel pipe was studied. The growth behavior of the holes in the process of deformation was also simulated.
Due to the non-uniform deformation between the grains, the equivalent plastic strain at the large-angle grain boundaries is larger than the equivalent plastic strain in a single grain, and the phenomenon that the post-diffusion of the wear-resistant steel pipe is accelerated from the grain boundary diffusion is verified experimentally and the theory Explanation. After the deformation of the high temperature diffusion, the first coarse and fine grain Cr alloy diffusion even dual annealing data, the greater the amount of deformation, the higher the degree of recrystallization of the alloy to improve and improve the wear-resistant steel pipe structure and performance. Under the same holding time, the segregation ratio of Cr and Mo decreases, and the fine grain boundaries increase the bulk diffusion of Cr. When the deformation is 75%, the strength of the alloy is the highest, which can promote the recrystallization of Al-Si alloy, And the recrystallized grains are roughened. After 0.5 h solution treatment at 500 ℃, the wear-resistant composite pipe is deformed rapidly at a faster speed, the recrystallized grain size becomes larger after annealing, and the larger the deformation amount is, the smaller the segregation ratio is. Deformation and recrystallization based on the role of grain refinement, deformation can greatly shorten the wear-resistant steel tube dendrite removal time required for the deformation of 60%, intergranular corrosion and exfoliation corrosion sensitivity is minimal, is now mesh-like crystal Ferrite, mechanical properties decreased.
After the elastic precursor wave, the sliding and deformation between the grain boundaries dominated the pre-plastic deformation mechanism. When the degree of deformation of the alloy was 75%, the pores grew easily along the large-angle grain boundaries and the recrystallized grains decreased significantly , Wear-resistant steel pipe the best overall performance.
