摘要:Inconel 718合金螺栓为航空发动机中常用的高强度螺栓,通常采用滚压螺纹成型工艺。螺栓及螺纹的流线直接影响螺栓的质量和服役寿命,所以流线检测尤为重要。通过试验,发现将Inconel 718合金螺栓进行二次固溶+时效处理可使其晶粒长大和析出δ相(Ni3Nb),然后在HNO3+HF的溶液中浸蚀1h,可以清晰显示出Inconel 718合金螺栓和螺纹的流线。
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