GH901合金锻件晶粒级别与均匀性对探伤杂波及底波损失的影响

Influence of grain grade and uniformity of GH901 alloy forgings on inspection clutter and bottom echo loss

针对多批次GH901高温合金锻件探伤底波损失与杂波超标不合格的质量问题,开展了多次GH901合金锻造工艺试验,根据锻件不同位置的超声波探伤结果与对应位置晶粒组织进行分析,得出晶粒组织对GH901合金锻件超声波探伤底波损失与杂波的影响。研究结果表明,GH901合金锻件超声波探伤底波损失与晶粒组织的粗细及均匀性存在对应关系,晶粒越细则超声波探伤底波反射回波越高,杂波低;晶粒越粗则超声波探伤底波反射回波越低,杂波高,当合金锻件晶粒达到2级或更粗时,锻件探伤杂波超标;当GH901合金锻件各区域组织差异较大时,锻件探伤底波损失不合格。

In order to solve the quality problems of multi-batch GH901 superalloy forgings,the forging process tests of GH901 alloy were carried out for many times.According to the ultrasonic inspection results at different positions of the forgings and the comparative analysis of the grain structure at corresponding positions,the influence of grain structure on the bottom echo loss of ultrasonic inspection and clutter of GH901 alloy forgings was obtained.The results showed that there was a corresponding relationship between the bottom echo loss of GH901 alloy forging and the thickness and uniformity of the grain structure,and the finer the grain size,the higher the bottom reflection echo of ultrasonic inspection and the lower the clutter.The coarser the grain,the lower the bottom reflection echo of ultrasonic inspection and the higher the clutter.When the alloy forging grain reached grade 2 or coarser,the inspection clutter of the forging exceeded the standard.When the microstructure difference of GH901 alloy forging was large,the bottom echo loss of ultrasonic inspection was not qualified.