Warm tensile deformation behavior of non-oriented Fe-3.3%Si steel strip
BAO Li1, WANG Lian-gang1, SHI Xian-li1, PANG Hong-xuan2, MEI Rui-bin1,3
1. School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, Hebei, China; 2. Technical Department, Puyang Iron and Steel Co., Ltd., Handan 056305, Hebei, China; 3. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China
Abstract：Uniaxial tensile tests were carried out on the hot-rolled Fe-3.3%Si steel within the temperature range of 250-700 ℃ and strain rate range of 0.001-0.1 s-1 by using an electronic testing machine, and the fracture morphology and microstructure after deformation were also observed and analyzed. The results showed that the tensile strength decreased obviously and the elongation increased exponentially with the increment of deformation temperature. The work hardening behavior was obvious and the non-uniform plastic deformation stage was shorter with lower temperature. Dynamic recovery and recrystallization occurred significantly in the alloy when the deformation temperature was up to 550 ℃. The fracture morphology was dimple with a lower strain rate. Compared with the shear fracture at low temperature, the dimples at high temperature were basically consistent with the tensile direction and belonged to the tensile fracture. There were quasi-cleavage fractures with the higher strain rate and the cleavage plane was gradually stratified from surface to center, forming a cleavage step or tearing edge. The deformation at the center of the tensile process was large, and the microstructure was mainly manifested as the deformation band. The microstructure of the surface was elongated and equiaxed grain with lower and higher temperature, respectively. The results are of great significance to the control of the microstructure and properties of silicon steel and the formulation and optimization of temperature rolling process.
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BAO Li, WANG Lian-gang, SHI Xian-li, PANG Hong-xuan, MEI Rui-bin. Warm tensile deformation behavior of non-oriented Fe-3.3%Si steel strip[J]. China Metallurgy, 2021, 31(6): 34-38.
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2021, Vol. 31 
