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采用Gleeble-3500热力模拟试验机研究了不同变形量下超洁净低活化马氏体钢(SCRAM钢)的组织结构和拉伸性能的变化。利用光学显微镜、透射电镜及扫描电镜对其微观组织进行了观察,用Instron-5848微型材料试验机对其拉伸性能进行了测试。结果表明:温变形可以有效的细化马氏体板条束和增加位错密度。随着变形量的增加,位错组态逐渐由位错线、位错堆积等低密度位错组态转变为重的位错缠结、位错胞等高密度位错组态。当变形量达到ε=0.5时,试样具有高的抗拉强度和屈服强度,但是伸长率和断面收缩率较低。拉伸断口表明随着变形量的增加,韧窝逐渐变得浅而细小。
The changes of microstructure and tensile properties of ultra-clean low-activation martensitic steel (SCRAM steel) under different deformations were studied by Gleeble-3500 thermal simulation test machine. The microstructure was observed by optical microscope, transmission electron microscope and scanning electron microscope. The tensile properties of the composites were tested with Instron-5848 micro-material testing machine. The results show that the thermal deformation can effectively refine martensite lath and increase the dislocation density. As the amount of deformation increases, the dislocation configuration gradually changes from low density dislocation configuration such as dislocation line and dislocation accumulation to heavy dislocation entanglement and dislocation cell dislocation configuration. When the deformation reaches ε = 0.5, the sample has high tensile strength and yield strength, but the elongation and reduction of area are lower. Tensile fracture shows that as the amount of deformation increases, dimples gradually become shallow and small.