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Q&P(Quenching andPartitioning,淬火配分)工艺在CCE条件下,通过采用M_s和M_f点之间的最佳淬火温度和低于M_s点的配分温度,避免配分阶段的贝氏体形成最终可以得到最高含量的残余奥氏体组织。但试验中得到不足体积分数8%的残余奥氏体含量限制了钢塑性的提高。通过提出淬火-贝氏体区配分工艺,并应用在(0.21~0.29)C-(1.5~2.0)Si-(1.5~2.1)Mn成分钢,得到了体积分数12%左右的残余奥氏体含量和25%左右的伸长率,同时强度保持在1 000~1 100 MPa,强塑积最高达到36.6 GPa·%。不同的淬火温度和配分温度试验结果表明,工艺变化对强度影响较低,伸长率和强塑积随着配分温度的提高而提高,其中270℃的淬火温度试样的提高幅度高于245℃淬火试样,采用Q&PB工艺得到了无碳贝氏体+马氏体+残余奥氏体的三相组织。淬火和贝氏体区配分得到了优异的强度和塑性的结合,为新一代汽车用钢的发展提供新的思路。
Q & P (Quenching and Partitioning) Processes Avoiding fractional bainite formation at CCE conditions by using the optimum quenching temperature between M_s and M_f points and the partition temperature below the M_s point will ultimately result in the highest content of Retained austenite. However, the amount of residual austenite, which is less than 8% of the volume fraction obtained during the test, limits the increase in steel ductility. The residual austenite content of about 12% of the volume fraction was obtained by applying the quenching-bainitic zone partitioning process and applying the (0.21-0.29) C- (1.5-2.0) Si- (1.5-2.1) Mn composition steel And about 25% elongation, while maintaining the intensity of 1 000 ~ 1 100 MPa, the maximum plastic modulus up to 36.6 GPa ·%. The results of different quenching temperature and partitioning temperature show that the change of process has less effect on the strength, and the elongation and the ductility increase with the increase of the partitioning temperature. The temperature rise of 270 ℃ quenching temperature is higher than 245 ℃ Quenching the sample, the use of Q & PB technology has been carbon-free bainite + martensite + retained austenite three-phase structure. Quenching and bainite zone division has been excellent strength and plasticity of the combination for the development of a new generation of automotive steel to provide new ideas.