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分析了不同变形温度下汽车用高塑性奥氏体TWIP钢的显微组织和力学性能。结果表明,在-50~550℃区间内,TWIP钢的伸长率和强度呈现的总体趋势为先降低后升高最后又降低,在温度为300℃出现峰值。低温变形时,大量变形孪晶存在于组织中,且随着变形温度的升高逐渐减少;温度为550℃时,孪晶消失,出现大量位错胞,实验钢试样发生软化;TWIP钢由于在低温变形时产生的高密度形变孪晶诱发的塑性,而具有良好的低温力学性能。
The microstructure and mechanical properties of high plasticity austenitic TWIP steel for automotive under different deformation temperatures were analyzed. The results show that in the range of -50 ℃ to 550 ℃, the overall trend of elongation and strength of TWIP steel decreases firstly and then increases and finally decreases, with a peak at 300 ℃. At low temperature deformation, a large amount of deformation twin exists in the microstructure and decreases with the increase of deformation temperature. When the temperature is 550 ℃, the twin disappears and a large number of dislocation cells appear and the experimental steel softens. The deformation caused by high temperature deformability twin induced plasticity, and has good low temperature mechanical properties.