Study on Corrosion Resistance and Mechanism of Enhanced IN718 Super alloy by Machine Hammer Penning Technology
IN718 superalloy is one of the most reliable materials under the working conditions of deep-sea submarine oil and gas extraction equipment.However,corrosion failure is the main cause of failure of superalloy parts.Therefore,the development of long-term anti-corrosion and life extension technology on the surface of superalloy has important value.In this paper,mechanical impact on the surface of the part is proposed to achieve long-term corrosion resistance and life extension on the surface of the superalloy.Result shows that Machine Hammer Penning(MHP)significantly improves the anti-corrosion performance of the alloy by decreasing surface roughness and increasing residual compressive stress.However,with the increase of the number of impacts,the anti-corrosion performance of the alloy surface shows an obvious decline trend.The process has high controllability and flexibility,providing a solid theoretical basis for using MHP technology to improve the service life of deep-sea oil and gas extraction equipment.
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