Study of the S Phases Formed on Plasma-nitrided Austenitic and Ferritic Stainless Steels

被引：4
作者：
Gontijo, L. C. [1 ]
Machado, R. [2 ]
Casteletti, L. C. [3 ]
Kuri, S. E. [4 ]
Nascente, P. A. P. [4 ]
机构：
[1] Coordenadoria Ciencia & Tecnol, Ctr Fed Educ Tecnol Espirito Santo, Ave Vitoria 1729, BR-29040780 Vitoria, ES, Brazil
[2] Inst Nacl Metrol, Normalizacao & Qualidade Ind, Div Metrol Mat, BR-25250020 Caxias, RJ, Brazil
[3] Univ Sao Paulo, Escola Engn Sao Carlos, Dept Engn Mat Aeronaut & Automobilist, BR-13560590 Sao Carlos, SP, Brazil
[4] Univ Fed Sao Carlos, Dept Engn & Mat, BR-13565905 Sao Carlos, SP, Brazil
来源：
THERMEC 2009, PTS 1-4 | 2010年 / 638-642卷
基金：
巴西圣保罗研究基金会;
关键词：
S phase; plasma-nitriding; stainless steel; corrosion; STRESS STATES; CORROSION-RESISTANCE; EXPANDED AUSTENITE; LOW-ENERGY; TEMPERATURE; DISCHARGE; BEHAVIOR; SURFACE; LAYER; TIME;
D O I：
10.4028/www.scientific.net/MSF.638-642.775
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
An expanded austenite layer is formed on the surfaces of austenitic stainless steels that are nitrided under low-temperature plasma. This S-gamma phase is an iron alloy metastable phase supersaturated with nitrogen. We have identified a similar expanded ferrite or ferritic S-alpha phase for nitrided ferritic (BCC) stainless steels. Samples of austenitic AISI 304L and AISI 316L and ferritic AISI 409L stainless steels were plasma-nitrided at 350, 400, 450 and 500 C, and the structural and corrosion characteristics of the modified layers were analyzed by X-ray diffraction (XRD) and electrochemical tests. For the austenitic AISI 304L stainless steel, the results showed that a hard S-gamma phase layer was formed on the surface, without corrosion resistance degradation, by using low plasma temperatures (350 and 400 degrees C). A similar behavior was observed for the austenitic AISI 316L stainless steel: the modified layers formed at 350 and 400 degrees C were constituted mainly by the S-gamma phase. Plasma-nitriding treatment of the terrine AISI 409L stainless steel caused the formation of a layer having high amount of nitrogen. XRD measurements indicated high strain states for the modified layers formed on the three stainless steels, being more pronounced for the ferritic S-alpha phase.
引用
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页码：775 / +
页数：3
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