Duplex Treatments
Mostrando 1-12 de 21 artigos, teses e dissertações.
-
1. Protección de acero para instrumentos quirúrgicos con recubrimientos duros en base carbono tipo DLC
ABSTRACT Martensitic stainless steels can be used in different applications such as surgical instruments where a good wear and corrosion resistance are required. Surface modification treatments such as nitriding improve the mechanical properties of these steels, however; they affect the corrosion resistance. For this reason, the DLC (Diamond Like Carbon) coa
Matéria (Rio J.). Publicado em: 19/07/2018
-
2. Double Kinetics of Intermetallic Phase Precipitation in UNS S32205 Duplex Stainless Steels Submitted to Isothermal Heat Treatment
One of the most studied deleterious phases in stainless steels is the sigma phase, due to its high potential to decrease the toughness and corrosion resistance of these steels. Eight samples of as-received cold rolled UNS S32205 duplex stainless steel were submitted to isothermal heat treatments at 850 oC during 10, 15, 30, 60, 120, 180, 240, and 300 minutes
Mat. Res.. Publicado em: 26/06/2017
-
3. Use of Magnetic Barkhausen Noise (MBN) to Follow Up the Formation of Sigma Phase in Saf2205 (UNS S31803) Duplex Stainless Steel
Abstract Duplex stainless steels have a structure normally composed of austenite and ferrite in approximately equal proportions. In order to attain control of its fabrication processes and performance, it is important to understand its microstructural evolution, due to the formation of intermetallic phases such as sigma (σ) and chi (χ), which may cause a s
Mat. Res.. Publicado em: 01/08/2016
-
4. AISI 1005 Steel Plasma Treated by Different Thermochemical Surface Treatments
Abstract To modify the surface structure of AISI 1005 steel and its properties without any dimensional loss, different plasma surface treatments were performed at low temperatures (500 ºC) in this study. The samples were subjected to single plasma treatments including: nitriding (N5% and N3%), carburizing (CE) and ferritic nitrocarburizing (NC) and to duple
Mat. Res.. Publicado em: 01/08/2016
-
5. Mechanical and Corrosion Properties of a Duplex Steel Welded using Micro-Arc or Laser
Duplex stainless steels have been extensively used in parts that are subject to corrosive environments and that have high mechanical strength requirements. Welding usually distorts the well-balanced austenite-ferrite ratio, and can produce brittle intermetallic phases; therefore, post-welding heat treatments are usually required. For applications where post-
Mat. Res.. Publicado em: 2015-08
-
6. Designing of CK45 carbon steel and AISI 304 stainless steel dissimilar welds
Gas tungsten arc welding of CK45 and AISI304 stainless steel was performed through preparation of different types of samples using ER308L and ERNi-1 wires. Welded samples were studied by different techniques including optical metallography, scanning electron microscopy equipped with energy dispersive X-ray spectroscopy (SEM-EDS), X-ray diffraction, hardness
Mat. Res.. Publicado em: 11/10/2013
-
7. Relationship between microstructure and fracture types in a UNS S32205 duplex stainless steel
Duplex stainless steels are susceptible to the formation of sigma phase at high temperature which could potentially be responsible for catastrophic service failure of components. Thermal treatments were applied to duplex stainless steels in order to promote the precipitation of different fractions of sigma phase into a ferrite-austenite microstructure. Quant
Mat. Res.. Publicado em: 07/06/2013
-
8. Simultaneous detection of Brazilian isolates of grapevine viruses by TaqMan real-time RT-PCR
The aim of this work was to evaluate the efficiency of real-time RT-PCR for detection of different isolates of ten important virus species that infect grapevines in Brazil: Grapevine leafroll-associated virus (GLRaV-1, -2, -3 and -5), Grapevine virus A (GVA), Grapevine virus B (GVB), Grapevine virus D (GVD), Grapevine rupestris stem pitting-associated virus
Trop. plant pathol.. Publicado em: 2013-04
-
9. Transporte atômico e reação química em nanoestruturas TiN e TiN/Ti em aço nitretado a plasma
The use of cutting tools in progressively more severe conditions in the metal-mechanics industry and the requirement to increase tool life against friction, wear and high temperature corrosion made of surface treatments an important protection method. One of the most modern treatments is the so-called duplex, that consists of plasma nitriding and deposition
Publicado em: 2008
-
10. Estudo da obtenção e das propriedades dos filmes de TiN e TiC depositados sobre aços ferramentas AISI H13 e D2 nitretados e não nitretados. / Study of the making and properties TiC and TiN coatings deposited on AISI H13 and AISI D2 toll nitrated and not nitrated steel.
Filmes de nitreto de titânio e carbeto de titânio foram obtidos por deposição reativa via magnetron sputtering, utilizando como gases reativos, nitrogênio e metano, respectivamente. Foram depositados filmes de TiN e TiC, primeiramente sobre substratos de aços ferramenta AISI H13 e AISI D2 temperados e revenidos. Posteriormente, realizou-se o tratamento
Publicado em: 2008
-
11. Obtaining by laser treatment and characterization of superface composite on cast duplex stainless steels / Obtenção por tratamento a laser e caracterização de composito superficial em aços inoxidaveis duplex fundidos
In this work was studied the orientation relations between austenite and ferrite in three cast duplex stainless steels, ASTM A890 1A, 3A, 6A on solution treatment. After that, simple laser surface remelting (LR) and laser melt injection (LMI) treatments were carried out on the alloys. The microstructural changes and the effects of laser treatments on hardnes
Publicado em: 2007
-
12. Degradação da resistência à corrosão de aços inoxidáveis duplex, devido ao envelhecimento em baixas temperaturas por tempos prolongados. / Degradation of the corrosion resistance of duplex stainless steel due to long aging at low temperatures.
Although duplex stainless steels exhibit good performance in many severe corrosive environments, their corrosion resistance can be hampered by precipitation of chromium (Cr) rich phases during aging heat treatments. Microstructural changes and corrosion behavior in two alloys with high and low content of chromium were investigated. Duplex stainless steels sa
Publicado em: 2004