Facultad Regional Concep. del Uruguay

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Author: search.filters.author.Simison, SilviaSubject: search.filters.subject.Stainless steel

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    Corrosion resistance of AISI 316L stainless steel nitrided by three different plasma assisted techniques
    (2014-07-23) Manova, Darina; Mändl, Stephan; Brühl, Sonia Patricia; Escalada, Lisandro; Simison, Silvia
    Plasma assisted surface modification methods have been used to nitride stainless steels in order to enhance and therefore the lifetime of industrial components. Nevertheless, the corrosion resistance is not always preserved since it is very sensitive to the process parameters, either in implantation or in thermochemical diffusion techniques. AISI 316L stainless steel was plasma nitrided using three different techniques: low energy ion implantation (LEII), plasma immersion implantation (PI3) and convencional DC pulsed plasma nitriding (DCPN). For each method sveral parameters were tested and some of them were selectedto achieve the so called S phase of about 3 um thickness and no nitrides precipitation. The nitrided layer was characterized with OM and SEM. Hardness wass assessed on the surface with Vickers indenter and 25 g load. XRD was performed to characterize The S phase and to detect other phases if present and electrochemical corrosion tests were carried out in 3.5% NaCI solution. Although the S phase thickness in the three groups of samples was comparable, hardness was not and neither wasthe corrosion resistance. The PI3 samples were he hardest with the best performance in corrosion experiments, resulting in a higher breakdown potencial and lower currents.
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    Influence of inclusions on the corrosion attack of plasma nitrided austenitic stainless steel
    (2013-09-08) Escalada, Lisandro; Brühl, Sonia Patricia; Suárez Vallejo, Sebastián; Guitar, María Agustina; Manova, Darina; Mändl, Stephan; Simison, Silvia
    Austenitic stainless steels are well known for their good localized corrosion resistance. They are commonly employed in components and instruments in the food and beverage, as well as chemical, oil and medical industries. However their use in some applications is limited due to their poor tribological properties.
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    Comparison of wear and corrosion behavior of three different nitriding methods on AISI 316L stainless steel
    (2013-07-05) Dalibón Bähler, Eugenia Laura; Vaca, Laura Silvia; Brühl, Sonia Patricia; Simison, Silvia; Escalada, Lisandro; Manova, Darina; Mändl, Stephan; Neumann, Horst
    In this work, AISI316L stainless steel was nitrided using three different processes: Low Energy Ion Implantation (LEII), Plasma Immersion Ion Implantation (PI3) and DC Pulsed Plasma Nitriding (DCPPN). The process temperature was chosen between 390 and 430 °C in all processes with the aim of preserving their corrosion resistance.
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    Corrosion and wear properties of plasma nitrided 316L stainless steel
    (2018-09-28) Brühl, Sonia Patricia; Simison, Silvia; Escalada, Lisandro; Manova, Darina; Maendl, Stephan; Vaca, Laura Silvia; Soldera, Flavio; Guitar, María Agustina
    Since 2010, in the frame of the European SUMA2 project and the binational project, the University of Saarland (Saarbrucken, Germany), the Leibniz Institute (Leipzig, Germany), INTEMA (Mar del Plata, Argentina) and the UTN-FRCU (Concepción del Uruguay, Argentina) have worked in collaboration to developed and characterize the successful nitriding of austenitic stainless steels by dierent plasma assisted techniques such as Plasma Immersion Ion Implantation (PI3), DC Pulsed Plasma Nitriding and Low Energy Ion Implantation (LEII) XRD have been performed in order to characterize the structure of the surface layers.
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    Corrosion resistance of AISI 316L stainless steel nitrided by three different plasma assisted techniques
    (2014-07-21) Manova, Darina; Mändl, Stephan; Brühl, Sonia Patricia; Escalada, Lisandro; Simison, Silvia
    Plasma assisted surface modification methods have been used to nitride stainless steels in order to enhance hardness and therefore the lifetime of industrial componentes. Nevertheless, the corrosion resistance is not always preserved since it thermochemical diffusion techniques. AISI 316L stainless steel was plsma nitrided using three different techniques: Low Energy Ion Implantation (LEII), Plasma Immersion Implantation (PI3) and conventional DC pulsed plasma nitriding (DCPN). For each method several parameters were tested and some of them were selected to achieve the so called S phase of about e um thickness and no nitrides precipitation. The nitrided layer was characterized with OM and SEM. Hardness was assessed on the surface with Vickers indenter and 25 g load. XRD was performed to characterize the S phase and to detect other phases if present and electrochemical corrosion tests were carried out in 3,5% NaCI solution. Although the S phase thickness in the three groups of samples was comparable, hardness was not and neither was the corrosion resistance. The PI3 samples were the hardest with the best performance in corrosion experiments, resulting in a higher breakdown potential and lower currents.