关键词: 超声波辅助淬火, 微观组织, 晶粒尺寸, 腐蚀性能

Abstract: As the main material used in ships and their equipment, steel is prone to corrosion due to working in high-salinity seawater environment for a long time, which affect its service life. In China, the annual loss of the hull steel caused by seawater corrosion even exceeds 50% of the total loss, which imposes significant hindrance on the development of the marine industry. The effects of the ultrasonic-aided quenching (USQ) heat treatment process on the microstructure and corrosion resistance of the sample is studied by the metallographic analysis, grain size statistics and electrochemical corrosion test of the 35CrMo steel used in rudder stock. The results show that in the microstructure of the USQ sample, the residual austenite disappears, the size and the uniformity of the grains are improved together with the significantly enhanced corrosion resistance.

Key words: ultrasonic-aided quenching, microstructure, grain size, corrosion