Analysis of Stress and Strain Inhomogeneity During the Tensile Deformation of Ferrite/Martensitic Dual Phase Steel
MA Cainv1, GAO Xueyun1,2, XING Lei1, WANG Haiyan1,2, HU Zhiyu1, ZHAI Tingting1
1 School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Monglia, China 2 Inner Mongolia Autonomous Region Key Laboratory of Advanced Metal Materials, Baotou 014010, Inner Monglia, China
Abstract: In the present work, the ferrite / martensite dual-phase steel was taken as the research object. After rolling and heat treatment, the tensile test with a deformation of 5% was performed. The field emission scanning electron microscope equipped with EBSD imaging system was utilized to analyze the micro-area orientation of the experimental steel after plastic deformation, and the plastic deformation behavior was simulated by combining the crystal plasticity simulation DAMASK software. The results showed that the two corresponding stress-strain distribution of ferrite / martensite dual-phase steel obtained by rolling deformation was uneven. The martensite accumulated more dislocations in the experimental steel, and the KAM value was larger. The Schmid factor of ferrite matrix near the martensite region was larger than 0.49, and dislocations and slips were prone to occur preferentially during elastic deformation. The consequences of crystal plasticity simulation showed that at the beginning of deformation, ferrite needed to bear large strain and martensite needed to bear stress to coordinate the overall deformation. When the tensile deformation continues to occur, the inhomogeneity of the two analogous force-strain distribution will lead to the first fracture at the two-phase boundary and at the grain boundary.
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2023, Vol. 37 
