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将16Mn R钢经过不同温度热处理后,制备成紧凑拉伸疲劳试验试样。通过疲劳试验获得了材料疲劳断裂的起裂值Ji。利用激光共聚焦显微镜对试样断口进行了分析,获得了断口表面的三维形貌。用分形理论计算了断口表面的分形维数,对断面的形貌进行了定量分析。结果表明,热处理温度对16Mn R钢的力学性能影响明显,随着热处理温度的变化,钢的起裂值Ji在900℃左右最低;断口表面分形维数也随之变化,起裂值Ji和分形维数之间存在对应关系。
The 16Mn R steel after heat treatment at different temperatures to prepare a compact tensile fatigue test specimen. The fatigue crack initiation crack value Ji was obtained through fatigue test. The fracture of the specimen was analyzed by laser scanning confocal microscope, and the three-dimensional morphology of the fracture surface was obtained. The fractal dimension of fracture surface was calculated by fractal theory and the morphology of the fracture surface was quantitatively analyzed. The results show that the heat treatment temperature has obvious effect on the mechanical properties of 16Mn R steel. With the change of heat treatment temperature, the rupture value Ji of steel is the lowest at about 900 ℃; the fracture surface fractal dimension also changes, the rupture value Ji and fractal There is a correspondence between dimensions.