摘要
核电站中,与冷却剂直接接触的阀门密封面的硬质合金耐磨堆焊层的焊材需严格控制Co含量。目前,采用铁基、镍基合金两种无钴硬质合金替代钴基合金进行阀门密封面的堆焊是核电阀门设备制造重点的研究方向。由于阀门硬质合金堆焊层厚度小,且属于奥氏体组织,其表面和内部缺陷的检测是一个难点和痛点^([1])。本文通过设计不同基材和堆焊层组合的试块,并加工不同深度和尺寸的人工缺陷,利用交流电磁场检测(ACFM)技术能够有效检出直径为0.5 mm的缺陷,最大检测深度可达5 mm,且对表面开口缺陷和内部裂纹类缺陷的检出能力优于孔洞类缺陷。此外,ACFM技术在检测镍基堆焊层时,其检测深度和灵敏度不低于铁基堆焊层。因此,ACFM技术是一种有效的无损伤检测方法,在核级阀门制造和维修中具有广阔的应用前景,未来需要进一步探索其在极限检测能力方面的应用。
In nuclear power plants,the hard alloy wear-resistant surfacing layer of the valve sealing surface that comes into direct contact with the coolant needs to strictly control its Co content.Currently,using iron-based and nickel-based alloys as cobalt-free hard alloys to replace cobalt-based alloys for valve sealing surface welding is a key research direction in nuclear power valve equipment manufacturing.Due to the small thickness of the valve hard alloy surfacing layer and its austenitic structure,detecting its surface and internal defects is a challenge.This paper designs test blocks with different base materials and surfacing layer combinations,and processes artificial defects of different depths and sizes.Using ACFM technology can effectively detect defects with a diameter of 0.5 mm,with a maximum detection depth of up to 5 mm.Moreover,its ability to detect surface opening defects and internal crack-like defects is superior to that of hole-type defects.Additionally,when using ACFM technology to detect nickel-based surfacing layers,its detection depth and sensitivity are not inferior to ironbased surfacing layers.Therefore,ACFM technology is an effective non-destructive testing method,with broad application prospects in the manufacturing and maintenance of nuclear-grade valves.Further exploration of its ultimate detection capabilities is needed in the future.
作者
李予卫
朱从斌
邹国伟
LI Yuwei;ZHU Congbin;ZOU Guowei(China Nuclear Power Engineering Co.,Ltd.,Shenzhen 518124,China)
出处
《电焊机》
2025年第12期116-121,共6页
Electric Welding Machine
关键词
ACFM检测技术
铁基和镍基耐磨堆焊层
无损检测
核电站阀门
ACFM detection technology
Iron-based and nickel-based wear-resistant surfacing layers
Non-destructive testing
Nuclear power plant valves
