High Nitrogen Stainless Steels
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Wear and Corrosion Study of Plasma Nitriding F53 Super duplex Stainless Steel
Super duplex stainless steels (SDSS) have high corrosion resistance because of their high contents of chromium, nickel, molybdenum and nitrogen but low wear resistance. To improve the wear resistance of these steels without affecting their corrosion resistance, samples of SDSS were treated by plasma ion nitriding at temperatures ranging from 350 °C to 570 �
Mat. Res.. Publicado em: 22/09/2016
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2. Martensitic Stainless Steels Low-temperature Nitriding: Dependence of Substrate Composition
Low-temperature plasma assisted nitriding is a very promising technique to improve surface mechanical properties of stainless steels, keeping unaltered or even improving their surface corrosion resistance. During treatment, nitrogen diffuses into the steel surface, increasing its hardness and wear resistance. In the present work the nitriding process of diff
Mat. Res.. Publicado em: 2015-06
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3. An Experimental and Numerical Approach for the Welding Effects on the Duplex Stainless Steel Microstructure
Key microstructural changes that occur when Duplex Stainless Steels (DSS) are welded could be evaluated when bead-on-plate welding was carried out on a 2205 DSS by the GMAW process. By using numerical simulations, it was possible to calculate locally the heating and cooling rates taking place during the 2205 DSS welding and discuss its correlation to the mic
Mat. Res.. Publicado em: 2015-06
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4. Investigating the correlation between some of the properties of plasma nitrided AISI 316L stainless steel
When AISI 316L stainless steels are submitted to the nitriding process at temperatures lower than 450 °C, a high nitrogen content expanded austenite phase is formed, which shows higher hardness and higher pitting corrosion resistance compared to the untreated material. As a result, this material becomes adequate for biomedical application. The conditions of
Mat. Res.. Publicado em: 28/05/2013
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5. Correlation between small punch and CVN impact tests for evaluation of cryogenic fracture characteristics of isothermally-aged nitrogen-containing austenitic stainless steels
The Charpy-V-notch impact test has been used routinely to evaluate the ductile-brittle behavior in steels. Likewise, the Small-Punch test has been applied to evaluate toughness properties in different materials. In this work, both tests were conducted at -196 °C on three types of austenitic stainless steels JN1, JJ1 and JK2, which were solution treated and
Materials Research. Publicado em: 06/03/2012
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6. Efeito do encruamento na cinética de nitretação dos aços inoxidáveis austeníticos
This paper deals with the effects of cold work on the nitriding kinetics and surface micro-hardness of the 3XX family of austenitic stainless steels. Nitriding is a thermo-chemical treatment based on the nitrogen diffusion and, under some specific circumstances, carbon in lower quantities, in to a ferrous matrix. The nitriding process improves particularly h
Publicado em: 2010
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7. CORROSION OF ADVANCED STAINLESS STEEL IN PHYSIOLOGICAL SOLUTIONS / Corrosão de aços inoxidáveis avançados em meios fisiológicos
The main objective of this study was to determine the corrosion behavior of advanced stainless steels (SS) in physiological solutions to evaluate their potential for use as biomaterials. Four stainless steels were tested: a superferritic stainless steel (DIN W. Nr. 1.4575), Incoloy MA 956, containing aluminum and yttrium oxide, an austenitic stainless steel
Publicado em: 2008
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8. Erosion-corrosion wear of high nitrogen stainless steels in a slurry. / Estudo do desgaste erosivo-corrosivo de aços inoxidáveis de alto nitrogênio em meio lamacento.
Os processos de erosão-corrosão são comumente encontrados em tubulações, válvulas e outros componentes usados na indústria química, petroquímica e na exploração de minérios. Quando a corrosão e a erosão atuam conjuntamente, os mecanismos de dano são complexos e em geral as perdas de massa associadas com esta combinação de processos são maio
Publicado em: 2007
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9. Predicting Microstructure Development During HighTemperature Nitriding of Martensitic Stainless SteelsUsing Thermodynamic Modeling
Thermodynamic calculations of the Fe-Cr-N System in the region of the Gas Phase Equilibria have been compared with experimental results of maximum nitrogen absorption during nitriding of two Martensitic Stainless Steels (a 6 mm thick sheet of AISI 410S steel and green powder compacts of AISI 434L steel) under N2 atmospheres. The calculations have been perfor
Materials Research. Publicado em: 2002-09
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10. Propriedades, microestruturas e mecanismos de nucleação de trincas por fadiga de dois aços inoxidaveis austeniticos utilizados como biomateriais
The ASTM F 138 stainless steel is current1y the most used material to produce orthopedic implants and a considerable nurnber of failure of temporary or perrnanent orthopedic implants occurs. Since some years the austenitic ISO 5832-9 stainless steel is also being used in implants fabrication as a replacement to the ASTM F 138 without a consistent research of
Publicado em: 2001