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通过热轧试验研究了两阶段轧制+层流冷却、空冷、超快冷的TMCP工艺对高硅铌钢、高硅Nb-Ti钢、低硅Nb-Ti钢显微组织和力学性能的影响。结果表明,控轧控冷后的试验钢含有铁素体、贝氏体、马氏体以及少量残余奥氏体的混合组织。在控轧控冷工艺参数相近的情况下,高硅铌钢、高硅Nb-Ti钢、低硅Nb-Ti钢的抗拉强度依次减小,其伸长率和强塑积依次增大。低硅Nb-Ti钢的伸长率和强塑积分别达到了41%、25 256 MPa.%的最大值。
The effects of two-stage rolling + laminar cooling, air cooling and ultra-fast TMCP process on the microstructure and mechanical properties of high-silicon niobium steel, high-silicon Nb-Ti steel and low-silicon Nb- . The results show that the controlled rolling and controlled cooling steel contains mixed microstructure of ferrite, bainite, martensite and a small amount of retained austenite. The tensile strength of high-silicon-niobium steel, high-silicon Nb-Ti steel and low-silicon Nb-Ti steel decrease with the similar process parameters of controlled rolling and controlled cooling. The elongation and the ductility of low-silicon Nb-Ti steels reach the maximum values of 41% and 25 256 MPa.%, Respectively.