ABSTRACT

Austenitic stainless steels are widely used in many sectors, especially in the food processing and chemical sectors, due to their superior corrosion resistance and suitably safe contact with foodstuffs. In this study, AISI 304 alloy, which cannot be hardened by traditional heat treatment methods, was hardened with the shot-peening method. Characterisation studies of shot peened samples in different coverage (100%, 200%, 500%, and 1500%) have been carried out, and their wear resistance and corrosion resistance have been tested. It has been found that surface hardness and wear resistance increase after shot peening. However, the as-peened, and peened and polished samples undergo localised corrosion in a chloride environment, and the pits were more pronounced for the 200% coverage as-peened, and peened and polished samples. On the other hand, both samples exhibited semi-capacitive loop and Warburg corrosion impedance resistance. In general, the corrosion resistance was poor for as-peened samples compared to peened and polished samples, but the formation of the oxide layer was better. According to the results of this study, using shot peening as a surface hardening method is recommended with polishing to improve wear resistance and hardness of AISI 304 alloy.

摘要

奥氏体不锈钢因其优异的耐腐蚀性和与食品的适当安全接触而广泛应用于许多部门，尤其是食品加工和化学部门。在这项研究中，无法通过传统热​​处理方法硬化的 AISI 304 合金采用喷丸硬化方法进行硬化。对不同覆盖率（100%、200%、500%和1500%）的喷丸样品进行了表征研究，并测试了它们的耐磨性和耐腐蚀性。已经发现喷丸处理后表面硬度和耐磨性增加。然而，喷丸处​​理、喷丸处理和抛光样品在氯化物环境中会发生局部腐蚀，而喷丸处理、喷丸处理和抛光处理的样品覆盖率为 200% 时，凹坑更为明显。另一方面，两个样品都表现出半电容回路和 Warburg 腐蚀阻抗电阻。一般来说，与喷丸和抛光样品相比，喷丸样品的耐腐蚀性较差，但氧化层的形成更好。根据这项研究的结果，推荐使用喷丸作为表面硬化方法并进行抛光以提高 AISI 304 合金的耐磨性和硬度。