Röntgenfluoreszenzspektrometrische Bestimmung des Schwefels in festen und flüssigen Brennstoffen

Anwendungsbereich der genormten Verfahren. Röntgenfluoreszenzspektrometrische Bestimmung des Gesamtschwefelgehaltes in Heizöl, Kohle und Koks. Untersuchungsbedingungen, Standardabweichungen und Zeitaufwand des Verfahrens. Einfluß der Bindungsform des Schwefels in Kohle auf das Meßergebnis.     

Untersuchung des Kriechverhaltens hochwarmfester Gasturbinenwerkstoffe

Investigation of the Creep Behaviour of Heat Resistant Gas Turbine Alloys The high temperature deformation bahaviour of typical investment cast materials and wrought alloys is measured in tensile tests, continuous and interrupted creep tests and annealing tests. In a special evaluation method the strain values determined in the different tests are combined. Examples for characteristic creep values and for characteristic creep values and for creep equations are given.     

Desaktivierung von technischen Silber-Trägerkatalysatoren für die Herstellung von Ethylenoxid

Deactivation of industrial supported silver catalysts for ethylene oxide production. In view of the model character of the reaction and the unique nature of the catalyst system, it is of interest to study the deactivation behaviour of technical supported silver catalysts for the production of ethylene oxide. In the present study the influence of the catalyst components support, silver, promoter and inhibitor upon the deactivation behaviour is described. The results of chemical, physical and technical investigations of various catalysts and catalyst components are presented. The investigations show that a decrease in the surface area of the exposed silver and increased deposition of chloride are responsible for catalyst deactivation. The possible influence of alkali promoters is discussed and modifications to the catalyst which have been described in the literature as influencing the deactivation are also evaluated.     

Die Analysenfabrik – eine Generation von zukunftsorientierten Eisenhüttenlaboratorien

Ausgehend vom Selbstverständnis eines Eisenhüttenlaboratoriums und dessen Prüfwerten als Dienstleistungsprodukt, werden die Rationalisierungsbemühungen einer Projektgruppe über Reorganisation, Mechanisierung, elektronische Datenverarbeitung und Motivation der Mitarbeiter beschrieben. Die Erfolge zeigen sich in Leistung, Kosten und Personal. Die ?Analysenfabrik“ hat sich bewährt und ist auch für die Aufgaben der Zukunft gerüstet.     

Comparison of several fatigue crack propagation laws with experimental results

The accuracy of several crack propagation equations published in recent years are tested on crack propagation behaviour of fourteen metallic materials. Some equations cannot be verified because they contain unknown material parameters. Four equations based on different crack propagation models yield reasonably good approximations of measured behaviour.     

Klärung der Aufgabe und logische Wirkzusammenhänge beim systematischen Projektieren und Konstruieren

Einteilung technischer Systeme. Hauptschritte und Vorgehen bei systematischer Arbeitsweise. Aufgabenklärung. Wirkzusammenhänge. Logische Wirkzusammenhänge. Logische Funktionen.     

Größeneinfluß und Dauerfestigkeitseigenschaften unter Besonderer Berücksichtigung optimierter Oberflächenbehandlung

Size Effect and Fatigue Properties with Respect to Optimized Surface-Treatment. A hyperbolic function describes the geometrical size effect of notched specimens made from heat treated steel. An estimation of fatigue properties of components under one level fatigue tests is possible, if there are comparable materials and surface properties. The fatigue properties of specimens are well described by standardized stress-N graphs. The slope of the stress-N graphs in the range of load cycle depends on the concentration factor and not on the size effect. The fatigue properties of components are largely increased by thermal and mechanical surface strengthening. For the determination of the improvement of fatigue properties it is important to known the initiation of cracking. The improved fatigue properties of inductive surface hardened smooth specimens can be explained by the initiation of cracking below the surface. Mechanically strengthened notched specimens start cracking on the surface. The increase of fatigue properties for these specimens is explained by compressive residual stresses. The fatigue properties of notched specimens can be improved by the optimisation of mechanical strengthening, to higher values than for smooth surface strengthened specimens. This is due to compressive residual stresses. They decrease the tensile stresses which are responsible for crack propagation. If the tensile stress is below fatigue limit for initiation of cracking the crack arrests immediately.     

Zeitstandverhalten einiger fortschrittlicher Schaufelwerkstoffe für Industriegasturbinen

Creep rupture behaviour of some advanced materials for industrial gas turbines The creep rupture behaviour of three DS-alloys, an ODS-alloy and a PM-alloy for gas turbine blades is investigated up to 20 000 h test duration. Further, the elastoplastic behaviour is determined in tensile tests and the contraction behaviour in long-term annealing tests. On this basis, a characterisation of the strength and partly a modelling of the deformation behaviour of the alloys is given.