高Mn高Si TWIP钢显微组织与力学性能

摘要

通过金相、拉伸、透射电子显微镜以及断口扫描等手段,研究了高 Mn,Si的Fe-Mn-Si-C合金的微观组织结构和力学性能特点,并研究了不同应变速率对Fe-Mn-Si-C合金力学行为的影响.研究结果表明:Fe-Mn-Si-C合金经1000℃×1h固溶处理后的原始组织为奥氏体,在奥氏体基体分布大量的退火孪晶.所有试验合金都具有较高的强度和塑性,大的强塑积,产生显著的孪生诱发塑性.降低应变速率拉伸可提高Fe-Mn-Si-C合金的塑性和强度,其塑性提高明显,而强度变化不显著.%The mechanical properties and microstructure characteristics of Fe-Mn-Si-C alloys are studied by metallographic observation and tensile test, and the effect of different strain rate on the impact properties of the Fe-Mn-Si-C alloys are austenite. The results show that after solution treatment at 1000℃ for 1 h, the original microstructure of the Fe-Mn-Si-C alloys are austenite and annealing twins. All alloys have higher strength and plasticity with a significant twin-induced plasticity. Reducing the strain rate can improve greatly the strength of the Fe-Mn-Si-C alloys, but the improvement of strength is no singificant.