Browsing by Author "Penalba, F."
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Item Effets d'un traitement thermomecanique de forge sur les proprietes d'aciers a dispersoiedes de V et Ti(1991-02) Penalba, F.; Carsi, M.; Garcia, G.; de Andres, M. P.; Zapirain, F.; Centros PRE-FUSION TECNALIA - (FORMER)The ductility of three steels microalloyed with V and with a variable Ti content. Comparison of the characteristics of connecting rod shanks manufactured with these three steels by controlled forging. Simulation by twisting to define the composition and forging parameters giving the best resistance and toughness. Twisting is a reliable tool for optimization of strain during forging.Item Improvement of the corrosion behaviour of construction steels(1998) Penalba, F.; Azkarate, I.; Irisarri, A. M.; Izaga, J.; del Barrio, A.; Tecnalia Research & Innovation; MATERIALES PARA CONDICIONES EXTREMASThe improvement of the corrosion behaviour of construction steels has been analyzed. This study followed two different lines. Firstly, the corrosion behaviour of steel directly exposed, unpainted, to the atmosphere is discussed. Weathering steels produced by the introduction of slight modifications in chemical composition and the use of alternating wetting and drying cycles exhibit a corrosion resistance that is up to eight times better than that of plain carbon steels. Moreover, the mechanical strength of these steels is higher, allowing a significant weight saving. Secondly, the protection of the steel by means of paints is considered. The use of metallic and organic coatings to protect the steel from the corrosive environment is discussed. The combination of both metallic and organic coatings that is very often used in order to provide a long term corrosion protection for steel used in building purposes has been studied by outer exposure of the samples to a marine environment. Best results were obtained by using a strontium chromate primer. A very marked influence of the inclination of these samples on the corrosion performance was observed. Those samples which have a lower inclination are corroded more easily probably due to the more difficult drainage of the rain compared to those with a higher slope, allowing its corrosive attack for a longer time.Item Joining technologies of construction steels. Recent advances and future possibilities(1998) Santamaria, F.; Jimenez, C.; Florez, S.; Penalba, F.; Irisarri, A. M.; EXTREMAT; POLIMEROS; Tecnalia Research & InnovationThis paper summarizes current joining techniques of flat and long products. Some examples are given of joining techniques being used in the construction of two civil works structures (KURSAAL and PASAJES HARBOUR), as well as faults more often found during the carrying out of pertinent checks. The latest tendencies in joining technologies in this field are also discussed, emphasizing the application of structural adhesives, showing comparative study of the mechanical behaviour of adhesively bonded joints in different materials subjected to cyclical ageing conditions and fatigue results with and without welds compared with fatigue tests of welded tests.