高Mn高SiTWIP钢显微组织与力学性能  

Microstructures and Mechanical Properties of TWIP Steels with High Mn and High Si Content

作　　者：覃作祥[1] 刘志强[1] 张剑波[1] 

机构地区：[1]大连交通大学材料科学与工程学院,辽宁大连116028

出　　处：《大连交通大学学报》2011年第4期48-52,共5页Journal of Dalian Jiaotong University

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 1 000℃ 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.

关 键 词：应变速率 FE-MN-SI合金 孪生诱发塑性 

分 类 号：TG142.1[一般工业技术—材料科学与工程]