It was found that the ultrasonic attenuation action of the gray iron was very obvious, however the ultrasonic attenuation action of nodular iron was next to nothing.

• 分析认为在通常采用的波长范围内,产生超声衰减的主要原因是灰口铸铁中石墨晶体的构造以及石墨组织的形状、大小和分布。