Abstract
39SiCrVTiA spring steel is heat-treated and compared with the existing high-strength spring steels 60Si2CrVA and SAE9254 for electrochemical impedance spectroscopy (EIS), polarization curve and slow strain rate testing (SSRT). The test results of electrochemical impedance spectroscopy (EIS), polarization curve show that the corrosion resistance of 60Si2CrVA was the best, followed by that of SAE9254 and 39SiCrVTIA.However, the test results of the SSRT test show that the three spring steels in 5% NaCl solution possess high SCC susceptibility. The SCC susceptibility of 39SiCrVTiA steel is slightly lower and the stress corrosion ability is better than the other two steels which may be related to its containing Ti, V elements and lower carbon content.
Highlights
High strength spring steel is widely used in railway, automobile, engineering machinery and other machinery manufacturing[1].This kind of spring steel, has been implemented in the high-stress design, such as the spiral spring for automobile suspension, but the further improving the strength index of steel has been greatly restricted
According to the current high-performance, highreliability and lightweight development trends of various types of mechanical devices, this paper develops alloy spring steel with high strength, high toughness and good corrosion resistance
The results of the long period immersion test show that the corrosion rates of the three spring steels are similar, and the steel SAE9254 has the highest corrosion rate, followed by 39SiCrVTiA and 60Si2CrVA steels
Summary
High strength spring steel is widely used in railway, automobile, engineering machinery and other machinery manufacturing[1].This kind of spring steel, has been implemented in the high-stress design, such as the spiral spring for automobile suspension, but the further improving the strength index of steel has been greatly restricted. According to the current high-performance, highreliability and lightweight development trends of various types of mechanical devices, this paper develops alloy spring steel with high strength, high toughness and good corrosion resistance. In the research and development of the current high-end spring products such as automotive and rail transit damping spring and stabilizer rod, the latest concept requirements of performance are put forward, enhancing the strength and toughness of the material at the same time pay attention to improve the spring material corrosion resistance to meet the needs of high reliability and lightweight mechanical products. The research and development of spring steel with high strength, high toughness and corrosion resistance has important practical engineering significance and good academic value. In view of the above situation, in order to improve the lowtemperature toughness of the material and ensure the durability of the coil spring in the corrosive environment, the 39SiCrVTiA spring steel with high strength and toughness has been developed
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