核主泵热屏用大型奥氏体不锈钢锻件超声检测小角度探头的选择

The Study of Small Angle Probe in Ultrasonic Testing of Large Austenitic Stainless Steel Forgings on Nuclear Main pump Hot Screen

针对核主泵中的热屏部件进行了大型奥氏体不锈钢锻件的超声检测工艺流程设计。该锻件内外径比大于1/2且探测厚度大于600mm,使超声检测难度加大,因此选择小角度纵波斜探头检测,并着重分析了检测中探头的选择及试块的校准方法。根据首批试件的检测结果,证明该流程设计合理,可用于指导工程实践,为核电设备制造的国产化及奥氏体不锈钢锻件超声检测标准的制定提供依据。

Ultrasonic testing process of large austenitic stainless steel forgings was designed which used in the nuclear main pump heat shield.The small angle longitudinal wave angle probe was selected considerating of the more difficulty because the ratio of inner diameter to outer diameter of the forging is greater than 1/2and at the same time the detecting thickness is more than 600 mm.And the calibration method of test block was analyzed emphatically as well as the selection of test probe.The process design is proved reasonable according to the first specimen testing results.It is applicable to guide the engineering practice and provide the basis for the localization of nuclear power equipment manufacturing and national austenitic stainless steel forgings ultrasonic testing standards.