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Abstract：
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In order to improve the bending deformation performance of STC330R enamel steel sheet used in electric heating head, the internal structure of STC330R steel sheet was strengthened by the pulse current assisted synchronous current loading method, and the influences of pulse current density on its bending performance and microstructure were analyzed. The results show that after increasing the current density, the sheet obtains a higher bending temperature, reduces the tension and compression asymmetry, and the degree of neutral layer offset is greatly reduced. However, after increasing the current density, when the plastic deformation occurs, the forming load is significantly reduced, and the sample temperature also increases to lead to high-temperature softening phenomenon. At the same time, the buckling-elastic ratio reduces, so the springback angle also decreases. With the increasing of current density, the number of twin crystal decreases, and a large number of twin crystal are formed in the inner area of sheet. Furthermore, when the grains are cut by twin crystal boundaries, many tiny grains are formed, the twin crystal boundary layers in the middle area are also observed obviously, a large number of equiaxed crystals with uniform sizes are formed outside the boundary layers, while only a few of twin crystal are formed in the outer structure of sheet.
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Funds：
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重庆市教委科学技术研究计划项目(KJQN202003602)
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AuthorIntro：
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作者简介：夏源（1986-），女，硕士，讲师，E-mail：sharon372141262@126.com
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Reference：
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