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Flexural-Shear Wave Propagation in Cracked Composite Beam.

Construction and Experimental Analysis of a Pedestrian Bridge with Concrete Deck and IPC Truss Girder

Simulating steam oxidation of high temperature plant under laboratory conditions: practice and interpretation of data

Specimens of ferritic and martensitic steels have been exposed to steam atmospheres at 550 °C using three different experimental procedures. Slight differences in scale growth kinetics were observed but the major differences were in the morphology of the oxide scales that were formed. The microstructures of the scales…

Composite coatings of titanium-aluminum nitride for steel against corrosion induced by solid NaCl deposit and water vapor at 600 °C

Composite coatings (Ti,Al)N with different Al content were deposited on a wrought martensite steel 1Cr11Ni2W2MoV by reactive multi-arc ion plating. With the addition of Al to the coatings, the crystallographic structure of them changed from B1 NaCl to B4 ZnS, the relevant hardness and adhesive strength firstly increas…

Assessing corrosion in oil refining and petrochemical processing

This paper summarizes the development of an information system used to manage corrosion of metals and alloys by high temperature gases found in many different oil refining, petrochemical, power generation, and chemical processes. The database currently represents about 7.9 million h of exposure time for about 5,500 te…

Nano-structured alloy and composite coatings for high temperature applications

Nano-structured materials often possess special properties that materials with identical compositions but ordinary grain size do not have. This paper reports our work on the surface nano-crystallisation and nano-structured alloy and composite coatings. A number of processing methods including magnetron sputtering, the…

Influence of the starting materials on performance of high temperature oxide fuel cells devices

High temperature solid oxide fuel cells (SOFCs) offer an environmentally friendly technology to convert gaseous fuels such as hydrogen, natural gas or gasified coal into electricity at high efficiencies. Besides the efficiency, higher than those obtained from the traditional energy conversion systems, a fuel cell prov…

Gas turbines: gas cleaning requirements for biomass-fired systems

Increased interest in the development of renewable energy technologies has been hencouraged by the introduction of legislative measures in Europe to reduce CO2 emissions from power generation in response to the potential threat of global warming. Of these technologies, biomass-firing represents a high priority because…

Experimental Validation of Refined Models of Composite Plates

A Comparative Study of Adhesively Bonded Composite Patch

Stress and integrity analysis of steam superheater tubes of a high pressure boiler

Sources that can lead to deterioration of steam superheater tubes of a high pressure boiler were studied by a stress analysis, focused on internal pressure and temperature experienced by the material at real operating conditions. Loss of flame control, internal deposits and unexpected peak charge are factors that gene…

Rare earth oxide coatings to decrease high temperature degradation of chromia forming alloys

The addition of small quantities of reactive elements such as rare earths (RE) to chromia or alumina forming alloys improves the high temperature oxidation resistance. Traditionally, these elements are alloying additions or are added as oxides to form a dispersion. The alloys can also be coated with RE oxides. Several…

High temperature corrosion issues in energy-related systems

The large majority of electric power that is generated world-wide involves heat engines of one kind or another. The significant exceptions are hydroelectric generation; wind; and photovoltaics. The thermal sources for the heat engines include: fossil fuels, nuclear fission, biomass, geothermal sources, and solar radia…

Corrosion penetration monitoring of advanced ceramics in hot aqueous fluids

Advanced ceramics are considered as components in energy related systems, because they are known to be strong, wear and corrosion resistant in many environments, even at temperatures well exceeding 1000 °C. However, the presence of additives or impurities in important ceramics, for example those based on Silicon Nitri…

Niobium and chromium rich coatings tailored by laser alloying: XRD analysis at high temperatures

Laser treatment technologies have been widely used to modify superficial layers of different materials. In this work we prepare Nb and Cr rich coatings according to laser alloying technique using cast iron as substrate material. Nb and Cr are intensive used in order to overcome challenges like good chemical and mechan…

Stress and adhesion of chromia-rich scales on ferritic stainless steels in relation with spallation

The relation between chromia scale spallation during oxidation or cooling down of ferritic stainless steels is generally discussed in terms of mechanical stresses induced by volume changes or differential thermal expansion. In the present paper, growth and thermal stress measurements in scales grown on different ferri…

Corrosion resistance of a steel under an oxidizing atmosphere in a fluid catalytic cracking regenerator

In the present work, the corrosion resistance of an ASTM A 387 G11 steel was evaluated under two conditions: an oxidizing atmosphere in a fluid catalytic cracking regenerator of a petroleum processing unit and a simulated atmosphere in the laboratory, at temperatures of 650 °C and 700 °C. The characterization of the p…

Editorial

High temperature degradation by erosion-corrosion in bubbling fluidized bed combustors

Heat-exchanger tubes in fluidized bed combustors (FBCs) often suffer material loss due to combined corrosion and erosion. Most severe damage is believed to be caused by the impact of dense packets of bed material on the lower parts of the tubes. In order to understand this phenomenon, a unique laboratory test rig at B…

Role of alloying elements and carbides in the chlorine-induced corrosion of steels and alloys

The high temperature corrosion of steels and Ni-base alloys in oxidizing and chloridizing environments is of practical interest in relation to problems in waste incineration plants and power plants using Cl containing fuels. The behaviour of the most important alloying elements Fe, Cr, Ni, Mo, Mn, Si, Al upon corrosio…