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本文应用扫描电子显微镜与扫描声学显微镜分别对４５＃钢板和某特种材料板激光打孔孔周材料进行了缺陷检测。在孔周２００μｍ的范围内发现材料发生了明显的相变，并存在大量的微裂纹。文中给出了裂纹的长度和深度信息
In this paper, scanning electron microscopy and scanning acoustic microscopy of 45 # steel and a special material plate laser perforation material defects were detected. A significant phase change occurred in the range of 200μm and a large number of micro-cracks were observed. The text gives the information of crack length and depth