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From the obtained results it highlights the presence of an area affected by the heat of up to 1. Also it was carried out an fractographic analysis of the fracture zone generated by the tenacity essays, what evidence a ductile fracture. The experimental values of resistance and tenacity are important for the study of the structural integrity of the encircling one of the core.

Velocities of crack growth in samples type CT pre cracking of stainless steel AISI l solder and sensitized thermally its were obtained by the Rising Displacement method or of growing displacement. Contrary to the idea of mitigation of the crack propagation velocity by effect of the addition of the hydrogen in the system, the values of the growth velocities obtained by this methodology went similar to the opposing ones under normal operation conditions.

To the finish of the rehearsal one carries out the fractographic analysis of the propagation surfaces, which showed cracks growth in trans and intergranular way, evidencing the complexity of the regulator mechanisms of the IGSCC like in mitigation conditions as the alternative Hydrogen Chemistry. Directory of Open Access Journals Sweden. Son ampliamente utilizados en las industrias de procesos químicos y, fundamentalmente, del petróleo y gas.

La soldadura de recargue, es utilizada en las industrias de fabricación y reparaci Full Text Available The monotonic and cyclic deformation behavior of ultrafine-grained metastable austenitic steel AISI L , produced by severe plastic deformation, was investigated.

Under monotonic loading, the martensitic phase transformation in the ultrafine-grained state is strongly favored. Under cyclic loading, the martensitic transformation behavior is similar to the coarse-grained condition, but the cyclic stress response is three times larger for the ultrafine-grained condition. The fatigue behaviour at room temperature of AISI - - L stainless steel welded joints obtained by two distinct welding methods was studied. The results obtained were compared to those characteristic of the base metal.

The welded joint fatigue samples were rectified in order to eliminate the effect of the welded seam geometry. It was concluded that the mechanisms of fatigue crack start in this case is commanded by the austenitic matrix, there being no influence of the delta ferrite rate and distribution present at the melted zone. Author [pt. The generated information was complemented with the analysis and diagnostic of the present damage in the surfaces exposed in both metals. The used electrochemical techniques allow to determine the corrosion velocities associated to each system, establishing that the uniform corrosion is not affected by the effect of the microorganisms; however, electrochemical noise, evidenced the formation of stings associated to the presence of bacteria.

The flexion fatigue behavior for the base metal and welded joint of an AISI L stainless steel type, used in the Angra-1 reactor, was determined. An automatic welding process was used with improved procedures in order to assure better welding metallurgy. Fatigue tests samples reinforcements were done to allow the evaluation of metallurgical variables, specially the role played by delta ferrite. The resulting welded joint showed better fatigue life than the base metal.

Delta ferrite was found to play an important role on the initiation and propagation processes of the fatigue cracks. The duration of the transient regime of neutron-induced swelling in annealed AISI L at 0 C is sensitive to both stress and displacement rate variations. The simultaneous application of both variables exerts a synergistic effect on the transient regime. The duration of this regime cannot be reduced below a required intrinsic exposure of approx.

Preparation of high-performance ultrafine-grained AISI L stainless steel under high temperature and pressure. Samples were sintered in high-pressure conditions using the highest martensite content of AISI L stainless steel powders milled for 25 h. Analyses of phase composition and grain size were accomplished by X-ray diffraction and Rietveld refinement. By comparing the reverse martensite transformation under vacuum and HTHP treat, we consider that pressure can effectively promote the change in the process of transformation.


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Compared with the solid-solution-treated L, the hardness and yield strength of the samples sintered under HTHP are considerably higher. This method of preparation of UFG bulk stainless steel may be widely popularised and used to obtain UFG metallic materials with good comprehensive performance. The corrosion resistance of austenitic stainless steels is known to be hampered by the loss of chromium available for passive surface layer formation as a result of chromium carbide precipitation at austenite grain boundaries during annealing treatments. Although high-temperature annealing can promote carbide dissolution leading to better corrosion resistance, grain coarsening also results, which would lead to poorer mechanical properties.

Processing methods to achieve both good corrosion resistance and mechanical properties are thus highly desirable for austenitic stainless steels. In the present study, we show that the corrosion resistance of AISI L stainless steel can be improved by grain refinement into the ultrafine-grained regime.

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Specifically, samples with different austenite grain sizes in the range of 0. All samples showed a typical passive behavior with similar corrosion potential, but the corrosion current density decreased significantly with decreasing grain size. The results show that the sample with the finest grain size had the best corrosion resistance due to a higher resistance of the passive layer to pitting attacks.

This study indicates that grain refinement which improves mechanical properties can also significantly improve the corrosion resistance of AISI L stainless steel. Durante el proceso de soldadura se siguió una especificación del procedimiento de soldadura WPS, para que los resultados fueran repetibles, minimizando los problemas de agrietamiento en caliente, agrietamiento en frío, formación de fase sigma y precipitación de carburos.

Sarsilmaz, Furkan [Firat Univ. Turkey ; Ozdemir, Niyazi [Firat Univ. The aim of the present study is to investigate the effect of welding parameters both on the electrochemical corrosion behavior and tensile strength of pre- and post-electrochemical corrosion of friction welded dissimilar steels. Moreover, tensile strength experiments were carried out determining the behavior of friction welded joints of pre- and post-electrochemical corrosion and results indicated that the maximum tensile test value of the dissimilar welded pre-electrochemical corrosion was higher than those of post-electrochemical corrosion and was also very close to AISI parent material value.

This report considers the damage oc-curring during TMF loading. It is shown how the temperature interval and the phasing in-phase, out-of-phase determine the mechanical response and the lifetime of the specimens. If creep-fatigue interaction takes place during in-phase cycling, the damage occurs inside the ma-terial, leading to intergranular cracks which reduce the lifetime considerably.

Out-of-phase cy-cling inhibits creep-induced damage, and no lifetime reduction occurs, even if the material is exposed periodically to temperatures in the creep regime. A formula is proposed which allows prediction of the failure mode, depending on whether creep-fatigue damage occurs or not. At a given strain rate, the formula is able to estimate the temperature of transition between pure fatigue and creep-fatigue damage.

The elliptical quadrant, appropriate for ductile materials, and the elliptical arc, appropriate for fragile materials, were included in the graph. The crack direction along the surface has been analyzed by using a microscope, with especial attention to the crack initiation zones. The crack direction during the Stage I has been compared with theoretical models.

Se evidenció crecimiento y refinación de grano ferrítico y formación de martensita en la zona afectada por el calor del metal base ferrítico.

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Se evaluó también la resistencia a la tensión hallando similitudes en todas las soldaduras. Estudio de la corrosión producida en aceros inoxidables en procesos de soldadura. Full Text Available En este trabajo de investigación se analizan las probetas de aceros inoxidables que después de haber sido soldadas mediante los procesos de soldadura SMAW, GMAW y GTAW, se sometieron a un ambiente corrosivo propio de las condiciones de trabajo. Under these conditions, the reaction zone between the substrate and coating is more compacted and well-adhered, with a microhardness of Vickers.

Cladding of aluminum on AISI L stainless steel by cold roll bonding: Mechanism, microstructure, and mechanical properties. Akramifard, H. The extrusion of Al through the surface cracks and settling inside the L surface valleys due to strong affinity between Al and Fe was found to be the bonding mechanism.

A significant drop in tensile stress—strain curves after the maximum point UTS was correlated to the interface debonding. It was found that the formation of intermediate layer by post heat treatment deteriorates the bond quality and encourages the debonding process. Moreover, the existence of strain-induced martensite in clad sheets was found to play a key role in the enhancement of tensile strength.

El refractario en la fabricación de acero inoxidable. Full Text Available The influence of the steelmaking process on the quality and the performance of refractory materials used on stainless steel production was described. The most important technical and design parameters of the processing units were explained and related with the slag chemical composition and the qualities of the refractories used. Nanosecond laser surface modification of AISI L stainless steel: Influence the beam overlap on pitting corrosion resistance. Surface modifications of AISI L stainless steel by laser surface melting LSM were investigated using a nanosecond pulsed laser-fibre doped by ytterbium at different overlaps.

The objective was to study the change in the corrosion properties induced by the treatment of the outer-surface of the stainless steel without modification of the bulk material. The corrosion resistance was evaluated in a chloride solution at room temperature by electrochemical tests. The results showed that the crystallographic structure, the chemical composition, the properties of the induced oxide layer and consequently the pitting corrosion resistance strongly depend on the overlap rate.

The most efficient laser parameters led to an increase of the pitting potential by more than mV, corresponding to a quite important improvement of the corrosion resistance. This latter was correlated to chromium enrichment 47 wt. However, these structural and chemical modifications were not sufficient to explain the change in corrosion behaviour: defects and adhesion of the surface oxide layer must have been taken into consideration.

Full Text Available Austenitic stainless steels are extensively used in various applications requiring good corrosion resistance and formability. For this purpose, samples were subjected to heavy cold rolling to produce a nearly complete martensitic structure. Microstructural characterizations have been performed using X-ray diffraction XRD, scanning electron microscopy SEM, and magnetic measurement, whereas the mechanical properties were assessed by tensile and hardness tests.

The role of martensitic transformation on bimodal grain structure in ultrafine grained AISI L stainless steel. Transmission electron microscopy TEM and nanoindentation were used to characterize the martensitic transformation, in order to relate it to the bimodal distribution of the austenite grain size after subsequent annealing. Calculation of the Gibbs free energy change during the reversion treatment showed that the reversion mechanism is shear controlled at the annealing temperature and so the morphology of the reverted austenite is completely dependent on the morphology of the deformation induced martensite.

Corrosión a alta temperatura de acero al carbono y acero inoxidable austenítico en atmósferas contaminadas por CO2. Los aceros al carbono y los inoxidables austeníticos son materiales potencialmente utilizables en condiciones de elevada temperatura gracias a su excelente relación entre sus propiedades est Full Text Available From a series of 22 typical 18Cr8Ni stainless steel 40 kg ingots, with copper variable concentrations from 0.

Full Text Available In this paper we have studied the resistance to corrosion of the L ferritic stainless steels, manufactured by powder metallurgy.

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We have compared the behaviour of the different series of L stainless steels sintered, tempered and annealing, in different corrosive environments. Finally, the microstructure of the steels was determined by means of scanning electron microscopy. Hemos evaluado y comparado distintas series de aceros inoxidables L sinterizados, templados y madurados a diferentes temperaturas en atmósfera de nitrógeno, introduciéndolos en varios medios corrosivos de distinta naturaleza.

El control de la microestructura necesita la optimización de las condiciones del conformado en caliente. El objetivo principal de este trabajo es estudiar el comportamiento termomec Losas de concreto reforzadas con acero inoxidable de desecho Reinforced concrete slabs with stainless steel waste. The results from an experimental program that explores the use of industrial waste materials specifically sheets of stainless steel that result of the currency coinage as reinforcement for concrete slabs are presented.

Twenty three full size beam-deck specimens were built in order to measure resistance, ductility and failure modes; the experimental analysis in models with reinforcement in different quantities shows that in some cases, under certain quantities and location, it is possible to reach similar load capacities and failure modes as specimens with traditional reinforcement.

Based on these results, it is concluded the feasibility of using the material described above as alternative reinforcement in structural concrete elements, as an economic option in the construction of social housing. Full Text Available In this work, the mechanical properties and microstructural features of an AISI L stainless steel in two presentations, bulk and fibers, were systematically studied in order to establish the relationship among microstructure, mechanical properties, manufacturing process and effect on sample size.

The materials have been observed to possess different mechanical and microstructural properties, which are compared and discussed.

Material Information

Processing of fine grained AISI L austenitic stainless steel by cold rolling and high-temperature short-term annealing. An advanced thermomechanical process based on the formation and reversion of deformation-induced martensite was used to refine the grain size and enhance the hardness of an AISI L austenitic stainless steel. Both low and high reversion annealing temperatures and also the repetition of the whole thermomechanical cycle were considered. While a microstructure with average austenite grain size of a few micrometers was achieved based on cold rolling and high-temperature short-term annealing, an extreme grain refinement up to submicrometer regime was obtained by cold rolling followed by low-temperature long-term annealing.

However, the required annealing time was found to be much longer, which negates its appropriateness for industrial production.