低硅低铝 TWIP 钢拉伸性能

设计并冶炼了了三种不同成分的低硅低铝的 TWIP 钢，将铸态下的 TWIP 进行热处理后轧制。对这三种 TWIP 钢进行了拉伸实验，研究低硅低铝条件下不同合金成分 TWIP 的拉伸性能。结果表明，当成分为 Fe-25Mn-1.0Si-1.5Al 时钢的抗拉强度明显降低，延伸率明显增大，强塑积为47500 MPa%。观察 TWIP 钢变形前后金相组织发现，变形前三种 TWIP 钢的微观组织没有明显区别，变形后1#钢会产生大量形变孪晶。在变形过程中形成了高密度的孪晶。同时，SEM 观察 TWIP 钢拉伸后的断口形貌会发现，TWIP 钢拉伸后的断口为韧性断口，断口处存在大量的等轴韧窝，这与 TWIP 钢的良好拉伸性能符合。

Study on Tensile Properties of Low Al and Si TWIP Steel

Three different TWIP steels with low Al and Si are designed and smelted. Afer hot rolling,static tensile test is done to study the mechanical properties of these TWIP steel. The results show that Fe-25Mn-1. 0Si-1. 5Al possesses the best mechanical properties with strength is 797 MPa and elongation rate is 59. 86% . Before deforma-tion these three TWIP steel have the same microstructure,but after deformation Fe-25Mn-1. 0Si-1. 5Al have more deformation twins than the other two. At the same time,observing the tensile fracture with SEM,the fracture of Fe-25Mn-1. 0Si-1. 5Al shows equiaxed dimplesand among the equiaxed dimples there are some deep and big dimples, too. All these evidences fit the good plastic characteristic of Fe-25Mn-1. 0Si-1. 5Al TWIP s teel.