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Stockholm, Sweden

Tidblad J.,Swerea Kimab Ab
Atmospheric Environment | Year: 2012

Climatic parameters and pollution data from the 6FP NOAHs ARK project 'Global Climate Change Impact on Built Heritage and Cultural Landscapes' together with chloride deposition data have been used to predict atmospheric corrosion of metals in 2010-2039 and 2070-2099. Maps of carbon steel and zinc show that future atmospheric corrosion of metals in Europe are dominated by the effects of chloride deposition in coastal and near-coastal areas. The change can in extreme cases be as high as one corrosivity category and in coastal areas of southern Europe corrosion can be higher than the highest values experienced today in Europe. © 2012 Elsevier Ltd.

Persson D.,Swerea Kimab Ab | Thierry D.,French Corrosion Institute | LeBozec N.,French Corrosion Institute | Prosek T.,French Corrosion Institute
Corrosion Science | Year: 2013

NaCl induced atmospheric corrosion of ZnAl2Mg2 coated, electrogalvanised (EG) and hot dipped galvanised (HDG) steel was studied using in situ infrared reflection absorption spectroscopy, XRD and SEM. Initial corrosion leads to the formation of Mg/Al and Zn/Al layered double hydroxides (LDHs) on ZnAl2Mg2, due to the anodic dissolution of Zn-MgZn2 phases and cathodic oxygen reduction on Zn-Al-MgZn2, Al-phases and on zinc dendrites. In contrast to EG and HDG, were no ZnO and Zn5(OH)8Cl2{dot operator}H2O detected. This is explained by the buffering effect of Mg and Al which inhibit the ZnO formation, reduce the cathodic reaction and corrosion rate on ZnAl2Mg2. © 2013 Elsevier Ltd.

M'Saoubi R.,Seco Tools AB | Chandrasekaran H.,Swerea Kimab Ab
International Journal of Advanced Manufacturing Technology | Year: 2011

Cutting tool temperature distribution was mapped using the IR-CCD technique during machining of carbon steel AISI 3115 and stainless steel AISI 316L under orthogonal cutting conditions using flat-face geometry inserts. The effect of work material treatment on tool temperature was investigated, and the results showed that AISI 3115 in heat-treated state displayed higher tool temperature than the as-rolled state. Stainless steel 316L with high sulphur content (0.027 wt.%) and calcium treatment displayed lower cutting tool temperature than the variant with low sulphur (0.009 wt.%). The experimental results were compared with theoretical tool temperature distributions based on a modified version of Komanduri and Hou's analytical model. In particular, variable frictional heat source and secondary shear were introduced and modelling of the tool stress distribution on rake surface was also considered. © 2011 Springer-Verlag London Limited.

Agency: Cordis | Branch: FP7 | Program: JTI-CS | Phase: JTI-CS-2012-1-SAGE-02-014 | Award Amount: 873.24K | Year: 2013

Green and sustainable engines require accurate and well documented material data for safe operation of the engines at optimum efficiency. The SAGE project aims at demonstrating open rotor engines and technologies to reduce fuel consumption, weight and increased efficiency of engine components. Structural integrity and safety of engine critical parts have to be considered with regard to design, manufacturing aspects and in-service maintenance and overhaul. The engine operating conditions, thermal and mechanical loads, material properties and other influencing parameters are affecting the Approved Life of the component. Extensive analysis, component & engine tests, and inspections during both component manufacturing and in-service have to be performed for verification. In particular, the regulations required for critical parts to fulfil appropriate damage tolerance criteria has to be considered, and the potential for failure from material, manufacturing and service induced anomalies within the Approved Life of the part. This means that the potential existence of various imperfections, defects and flaws in the component are recognized and are due to material issues, component design and manufacturing. This situation can be handled through the incorporation of fracture resistant design, process control and Non-destructive Testing (NDT). In fabricated components and structures different visual inspection and NDT methods are being used for weld inspection. The quality of the welds will determine the fatigue life of a component. This project will focus on welds made in IN718, both laser welds and TIG welds. Before testing the specimens will be NDT tested (WP2), then high cycle fatigue tested (WP4), creep fatigue tested (WP5), fracture surfaces examined (WP3), statistical analysis performed (WP6) and finally the lifing model developed (WP7). The model will then be put to use by the topic manager for design of green and sustainable engines.

Agency: Cordis | Branch: FP7 | Program: BSG-SME | Phase: SME-1 | Award Amount: 1.20M | Year: 2011

The SignaStir project will develop an effective in-process quality assurance system for the inspection of friction stir welds (FSW) predominantly used in the manufacture of aluminium rolling stock and marine vessels. The SignaStir system will determine the unique and holistic weld quality signature. There is currently no capable inspection system available on the market either as a stand-alone unit or integrated with a welding machine to perform this task. Welding is an enabling manufacturing technology for joining materials, which directly affects cost, safety and reliability and therefore has significant economic impact. Production and supply of flawed or defective welds is unacceptable and may result in unsafe products of low structural integrity. To overcome the technical barriers to development of such an inspection system an SME partnership will require the services of research and technology providing organisations to deliver precompetitive research leading to the development of the product. There is a need for a low cost welding method, which can overcome the limitations of conventional fusion welding techniques. FSW has many economic, environmental and safety advantages over conventional welding but is a relatively new development and potential users require added confidence to make the initial capital investment required. The full benefit of the FSW process can only be achieved through application where weld quality is guaranteed to be correct each and every time. When developed the SignaStir system will give European manufacturers added confidence in their welded products and reduce costly off-line inspection of production parts. Scrap and re-work rates will be reduced as quality issues will be detected immediately after welding by the SignaStir system.

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