【摘要】 本工作用ＥＰＭ－８１０电子探针二次电子线扫描法，研究了４５号钢在不同回火温度条件和室温拉伸下试样断口表面的分形。结果表明，分形维数Ｄ＜１．２７９时断口沿晶断裂，１．２７９＜Ｄ＜１．８１３时，断口呈韧性断裂，分形维数Ｄ由小逐渐增大时，金相组织从回火马氏体转变成回火索氏体。更多还原

【Abstract】 In this paper,the fractals of the fractured surfaces of CK45 steel specimens were stueied experimentally with an EPM-810 electronmicroprobe. The tensile test were performed at room temperature and the specimens were tempered at different temperatures.The experimental results showed that when the fractal dimension D<1. 279 the fracture surface shows an almost intergranularfracture,when 1.279<D<1.613, the fracture appearance for net dimples.As the fractal dimension D increased. the microstructure from tempering martensite trasformed to tempering sorbite.更多还原