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首页> 外文期刊>Applied Surface Science >A study on the effect of ultrashort pulsed laser texturing on the microstructure and properties of metastable S phase layer formed on AISI 316L surfaces
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A study on the effect of ultrashort pulsed laser texturing on the microstructure and properties of metastable S phase layer formed on AISI 316L surfaces

机译：超短脉冲激光织构化对AISI 316L表面形成的亚稳S相层的组织和性能的影响

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摘要

Austenitic stainless steels (ASS) are an important material within the food and medical industries. However, their current limitations of poor wear resistance and susceptibility to bacterial colonisation have limited further uptake. Low-temperature plasma nitriding can address the poor durability of the ASS alloys by forming the S phase, therefore, providing combined improvement in hardness, wear resistance and corrosion resistance. Additionally, pulsed laser texturing can also be used to introduce functional antibacterial textures. However, due to the thermal nature of laser patterning and the thermodynamic metastability of the S phase, almost no research has been conducted thus far on combining the technologies.Therefore, this study for the first time has investigated the response of S phase treated surfaces to ultrashort (nano and femtosecond) laser texturing. The results have shown that, both theoretically and in practice, laser pulses within the nanosecond regime led to the damage of the surface, decomposition of the metastable S phase and loss of the corrosion resistance. In contrast, no change of the S phase surface layer could be detected following femtosecond laser texturing. Hence, demonstrating the feasibility of texturing S phase surfaces using femtosecond pulsed lasers, thus paving the way towards long-lasting multi-functional antibacterial stainless steel surfaces.
机译：奥氏体不锈钢（ASS）是食品和医疗行业中的重要材料。然而，它们目前的耐磨损性差和对细菌定植的敏感性的局限性限制了进一步的吸收。低温等离子体渗氮可以通过形成S相来解决ASS合金的较差耐久性，因此，可以提高硬度，耐磨性和耐腐蚀性。另外，脉冲激光纹理化还可用于引入功能性抗菌质地。但是，由于激光刻图的热性质和S相的热力学亚稳定性，迄今为止几乎没有关于结合这些技术的研究。因此，本研究首次研究了S相处理过的表面对表面的响应。超短（纳米和飞秒）激光变形。结果表明，无论从理论上还是在实践中，纳秒范围内的激光脉冲都会导致表面损坏，亚稳S相的分解以及耐蚀性的降低。相反，在飞秒激光织构化之后，无法检测到S相表面层的变化。因此，证明了使用飞秒脉冲激光对S相表面进行纹理化的可行性，从而为持久的多功能抗菌不锈钢表面铺平了道路。

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