ISSN 2594-5327
58º Congresso anual — Vol. 58 , num. 1 (2003)
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Samples of AISI 304 austenitic stainless steel were treated by a modified ion nitriding process. The process consists of a nitriding cycle at high pressure and temperature, followed by a cycle at low pressure under the high temperature attained in the first cycle. These treatments were performed using two gas mixture of (N₂/H₂):(50/50) and (80/20). Results of glancing and normal X-ray diffraction showed clearly the standard austenite γ-phase, the expanded austenite γN-phase, induced by the presence of nitrogen atoms in solid solution and also the martensite α-phase. Microhardness Vickers tests, with 25gf load, showed surface hardness 1.8 to 2.7 times higher than the standard AISI 304 value. These results were attained within treatment times ranging from 70 to 150 min. These times are very short, compared with more classical nitriding processes.
Samples of AISI 304 austenitic stainless steel were treated by a modified ion nitriding process. The process consists of a nitriding cycle at high pressure and temperature, followed by a cycle at low pressure under the high temperature attained in the first cycle. These treatments were performed using two gas mixture of (N₂/H₂):(50/50) and (80/20). Results of glancing and normal X-ray diffraction showed clearly the standard austenite γ-phase, the expanded austenite γN-phase, induced by the presence of nitrogen atoms in solid solution and also the martensite α-phase. Microhardness Vickers tests, with 25gf load, showed surface hardness 1.8 to 2.7 times higher than the standard AISI 304 value. These results were attained within treatment times ranging from 70 to 150 min. These times are very short, compared with more classical nitriding processes.
Palavras-chave
glancing X-ray diffraction, nitriding, AISI 304
glancing X-ray diffraction, nitriding, AISI 304
Como citar
G.F., Gomes,; M., Ueda,; E., Abramof,; M., Silva, M..
Glancing and normal incidences X-ray diffraction of plasma ion nitrided austenitic stainless AISI 304 steel,
p. 2959-2967.
In: 58º Congresso anual,
Rio de Janeiro, Brasil,
2003.
ISSN: 2594-5327, DOI 10.5151/2594-5327-3032
