Browsing by Author "Mändl, Stephan"
Now showing 1 - 6 of 6
- Results Per Page
- Sort Options
Item 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, HorstIn 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.Item Comportamiento al desgaste de AISI 316L nitrurado por plasma en procesos de corto tiempo(2017-10-18) Vaca, Laura Silvia; Guitar, María Agustina; Charadía, Raúl; Manova, Darina; Mändl, Stephan; Brühl, Sonia PatriciaEn este trabajo se presenta la comparación de la resistencia al desgaste por fretting de muestras de AISI 316L nitruradas por tres métodos diferentes asistidos por plasma, PIII, LEII y nitruración DC, para aplicaciones mecánicas de piezas sometidas a vibraciones.Item 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, SilviaPlasma 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.Item 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, SilviaPlasma 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.Item Efecto de las inclusiones en la morfología del ataque localizado en acero AISI 316L nitrurado con técnicas asistidas por plasma(2013-08) Escalada, Lisandro; Brühl, Sonia Patricia; Suárez Vallejo, Sebastián; Guitar, María Agustina; Manova, Darina; Mändl, Stephan; Simison, SilviaLos aceros inoxidables austeníticos son conocidos por su buena resistencia a la corrosión localizada. Sin embargo, su uso se ve limitado por sus pobres propiedades tribológicas. Durante los últimos años, se han implementado métodos asistidos por plasma para mejorar las propiedades superficiales de estos aceros. En este trabajo se analizan muestras de acero inoxidable AISI 316L nitrurado mediante los siguientes métodos: i) plasma sostenido por una descarga DC pulsada, ii) implantación iónica de baja energía (LEII) y iii) de alta energía (PI3). Las capas nitruradas fueron caracterizadas con XRD, microscopía óptica y SEM/EDS. La resistencia a la corrosión localizada fue analizada mediante curvas de polarización anódica cíclica en solución de NaCl 3.5%. Se relacionaron los resultados con el espesor de la capa nitrurada y con las inclusiones presentes en el metal base. El efecto de las inclusiones fue estudiado mediante FIB/SEM, y observación de la sección transversal de las muestras corroídas por microscopía óptica y electrónica.Item 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, SilviaAustenitic 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.