Stability of expanded austenite, generated by ion carburizing and ion nitriding of AISI 316L SS, under high temperature and high energy pulsed ion beam irradiation
| Autor: | Edoardo Bemporad, Jorge Feugeas, J. García Molleja, Mattia Piccoli, R. Moroso, M. Milanese, J. Niedbalski, J. Bürgi, L. Nosei |
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| Přispěvatelé: | García Molleja, J, Milanese, M, Piccoli, Mattia, Moroso, R, Niedbalski, J, Nosei, L, Bürgia, J, Bemporad, Edoardo, Feugeas, J. |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Austenite
Materials science Ion carburizing Ciencias Físicas Metallurgy Crystalline stability Surfaces and Interfaces General Chemistry Condensed Matter Physics Microstructure Fluence Surfaces Coatings and Films Carburizing Ion Plasma focus Expanded austenite Lattice constant Materials Chemistry Irradiation Composite material Nitriding CIENCIAS NATURALES Y EXACTAS Física de los Materiales Condensados |
| Popis: | Expanded austenite can be generated on austenitic stainless steels either by ion carburizing or ion nitriding. In both cases the resulting fcc crystal structure, supersaturated with nitrogen or carbon, is strongly hardened with improved wear-resistance, while maintaining the original resistance to corrosion. In this work, we have studied the stability of expanded austenite, generated by ion nitriding and ion carburizing on AISI 316L SS with N and C, under: a—high temperature (225 °C – 504 °C), and b—under irradiation with high energy (30 keV – 500 keV), high fluence (~ 1015 cm− 2), short duration (~ 400 ns) light (deuterium and helium) ion beams. It was found that expanded austenite is stable below 325 °C. Between 325 °C and 504 °C expanded austenite lattice parameter presents gradual reduction with increasing temperature. We observed microstructural changes related only to the temperature treatment. We did not observe any microstructure change due to the duration of the heat treatment. Over 504 °C, the lattice parameter returns to the material's austenite original parameter. On the other hand, when irradiated with pulsed ion beams, a gradual reduction of the lattice parameter corresponding to the expanded austenite with the number of pulses was observed. This behavior can be explained through the thermal shock induced on the surface by each beam, consisting in fast heating followed by fast cooling that induces the gradual exo-diffusion of N (or C). Nevertheless, after 20 ion pulses, a final lattice parameter slightly higher than the corresponding to the original austenite was found as stable limit. This residual expansion can be attributed to partial amorphization of the first few micrometers that induces stresses on the crystals of austenite which are closer to the surface layers. Fil: García Molleja, J.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Rosario. Instituto de Física de Rosario (i); Argentina Fil: Milanese, Maria Magdalena. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto de Fisica Arroyo Seco; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Tandil; Argentina Fil: Piccoli, M.. Università Roma Tre. Dipartimento di Ingegneria Meccanica e Industriale; Italia Fil: Moroso, Roberto Luis. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto de Fisica Arroyo Seco; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Tandil; Argentina Fil: Niedbalski, Jorge Julio. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto de Fisica Arroyo Seco; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Tandil; Argentina Fil: Nosei, L.. Universidad Nacional de Rosario. Facultad de Ciencias Exactas, Ingeniería y Agrimensura. Instituto de Mecánica Aplicada y Estructuras; Argentina Fil: Burgi, Juan Mauel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Rosario. Instituto de Física de Rosario (i); Argentina Fil: Benporad, E.. Università Roma Tre. Dipartimento di Ingegneria Meccanica e Industriale; Italia Fil: Feugeas, Jorge Nestor. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Rosario. Instituto de Física de Rosario (i); Argentina |
| Databáze: | OpenAIRE |
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