1. Modificações estruturais induzidas por hidrogenação catódica em aço austenítico soldado e nitretado a plasma.
- Author
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Nascimento, Fabiana Cristina, Ferreira, Elton L. D., Foerster, Carlos Eugênio, Júnior, Clodomiro Alves, Kuromoto, Neide Kazue, Paredes, Ramon Siguifredo Cortes, and Lepienski, Carlos Maurício
- Subjects
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HYDROGENATION , *NITRIDING , *CORROSION & anti-corrosives , *AUSTENITIC stainless steel , *MICROSCOPY , *STOICHIOMETRY , *STEEL welding , *SOLDER & soldering , *RIETVELD refinement - Abstract
Structural characterization of weld and outside weld regions of AISI-304 nitrided (20%N + 80%H) and cathodically hydrogenated is presented. Nitriding temperatures were 400, 500 e 550°C. The weld and outside weld regions were compared by XRD, optical microscopy and SEM. The phases γ-austenite, α'-martensite, ϵ-martensita and α-ferrite and the nitrides: CrN, γ'-Fe4N e ϵ-Fe2+xN were identifi ed. Microstructures of both regions and the thermal active zone were similar. For 400°C the stoichiometry of the formed phases was different from that formed at 500°C and 550°C. Hydrogen effects were more intense for 550°C, due to chipping occurrence. [ABSTRACT FROM AUTHOR]
- Published
- 2010
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