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中文摘要：
为了降低裂纹的扩展速率并提高其性能,利用高密度脉冲电流对带有预制单边裂纹的Inconel 625进行止裂处理。利用金相显微镜（OM）、透射电子显微镜（TEM）对脉冲电流处理前后裂纹尖端微观组织结构进行分析;利用维氏硬度计及拉伸试验机对脉冲电流处理前后试样的显微硬度、抗拉强度及伸长率进行测量。结果表明：脉冲电流处理后裂纹尖端组织由等轴晶转变为枝晶,且在枝晶前方有细小晶区出现,晶粒内部位错密度降低,位错平行排布向晶界处运动。经脉冲电流处理后,裂纹尖端的显微硬度少量增加,在不降低伸长率的同时,试件抗拉强度提升23.85%。
英文摘要：
For the purpose of reducing crack propagation rate and improving its performance,crack arrest of Inconel 625 with prefabricated unilateral crack was performed by high density electropulsing technology. The microstructure at the crack tip was analyzed by means of optical microscope（ OM） and transmission electron microscope（ TEM）. The microhardness,tensile strength and elongation of the sample were measured using the Vickers hardness tester and tensile testing machine. The results show that the microstructure at the crack tip turns into the columnar crystals from the isometric crystal,and the fine crystals area is observed in front of them. The dislocation density in grains decreases,and the dislocation with paralleled configuration move to the grain boundary. The microhardness of the crack tip is slightly increased after electropulsing treatment,and the tensile strength is enhanced by 23. 85% with the same elongation as before.
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