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用拉伸试验、金相观察、SEM和EDS等方法研究固溶温度和时间对TWIP钢微观组织、拉伸性能及断口形貌的影响,并采用X射线衍射仪测定材料的物相组成。结果表明,固溶温度和时间对TWIP钢塑性的影响程度明显大于强度,伸长率最佳的固溶处理工艺为1000~1050℃固溶60 min。随固溶温度的升高和固溶时间的延长,奥氏体晶粒长大,退火孪晶数量和退火孪晶界面积增加。拉伸时发生典型的延性断裂,拉伸前的组织为伴有大量退火孪晶的奥氏体,在拉伸过程中退火孪晶转变成形变孪晶,使TWIP钢的塑性提高。
The effects of solution temperature and time on the microstructure, tensile properties and fracture morphology of TWIP steel were investigated by tensile test, metallographic observation, SEM and EDS. The phase composition of the material was determined by X-ray diffraction. The results show that the effect of solution temperature and time on the ductility of TWIP steel is obviously greater than that of strength, and the solution treatment with the best elongation is 1000 ~ 1050 ℃ for 60 min. With the increase of solution temperature and solution time, the grain size of austenite, the amount of annealing twins and the area of annealing twin boundary increase. Tensile fracture occurs when the typical ductile deformation before the organization is accompanied by a large number of annealed twin austenite, annealed during the twins into twinning deformation, TWIP steel plastic increased.