Effect of uneven heating on microstructure and forming property of SAE1010 low carbon steel plate
LIU Po1, LIU Zheng1, ZHANG Yao-cheng2, XU Feng2, XIONG Yi-feng2,3
1. School of Mechanical Engineering, Guilin University of Aerospace Technology, Guilin 541004, Guangxi, China; 2. School of Automotive Engineering, Changshu Institute of Technology, Changshu 215500, Jiangsu, China; 3. School of Mechanical and Electric Engineering, Soochow University, Suzhou 215021, Jiangsu, China
Abstract：In order to investigate the effect of uneven heating during annealing on the sheet microstructure and forming property, cold rolling and continuous annealing were applied on the hot-rolled SAE1010 low carbon steel plate. The microstructure of the edge and center of hot-rolled, cold-rolled and annealed steel plate was investigated. The tensile and bending tests were carried out on the edge and central samples of the annealed plate. The results showed that a small amount of island-shaped pearlite in the hot-rolled specimens was distributed at the ferrite grain boundary and the grain size of the edge area was smaller than that of the central area. And partial lamellar cementite in the pearlite was degraded to be spherical. The microstructure of the cold-rolled sheet was characterized by the grain breakage along the rolling direction. There were many larger grains and granular cementite clusters in the edge area of the annealed steel, and the microstructure of the central area was relatively tiny and uniform. The elongation of the core material of the annealed sheet was higher than that of the edge, while the strength was smaller than that of the edge. After 180° bending, the core steel plate did not crack and the edges appeared cracks. The annealing temperature uniformity had an important influence on the microstructure and property of SAE1010 low carbon steel sheet.
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2020, Vol. 30 
