白光相移干涉, 韧窝断口, 三维形貌, 改进立方体覆盖法, 分形维数

White light phase-shifting interferometry was adopted,for the measurement of microstructure of 30CrMnSiA alloys dimple fracture surface herein.The system used Linnik structure, and it was achieved optical magnification of 10,lateral optical resolution of 1.2μm, vertical resolution better than 30nm, maximum measurement range up to 80μm in the experiments. The three-dimensional topography data was tested by improved cubic covering method, obtaining the fracture surface fractal dimension value of 2.0317, correlation coefficient of 0.9983. The results show that the dimple fracture surfaces of 30CrMnSiA alloys possess a typical three-dimensional fractal characteristics.This study was proved by the experiments that: white light phase-shifting interferometry is a new method for three-dimensional micro-fracture morphology testing and

reconstruction of metallic materials, with property of high vertical resolution and reconstruction efficiency, fast speed and so on.