Einfluss der Carbidausscheidungen auf das Kriechverhalten von Hochtemperaturlegierungen

The effect of carbon content on the creep behaviour of Ni Cr22 Co12 Mo (INCONEL 617) and X10 NiCrAlTi 3220H (INCOLOY 800H) has been investigated at 850 and 950 °C. In addition to the examination of heats of different carbon content, commercial heats (carbon content 0 .08 wt .-%) were carburized before or during testing. Tests on the commercial alloys in a decarburizing atmosphere were also carried out. Pre-carburized specimens exhibited a significantly higher creep rupture strength than solution treated specimens and specimens tested in a carburizing atmosphere. The tests on alloys of different initial carbon contents showed that the secondary creep rate decreased with increasing carbon content. Specimens which were tested in a decarburizing atmosphere exhibited a very high creep rate after only a few hours of testing. The rupture times for specimens tested in the decarburizing atmosphere were an order of magnitude shorter than those of specimens tested in air or in carburizing atmospheres at the same temperature and stress. The very low creep rupture strength of the decarburized material is attributed to the absence of grain boundary carbides, with the result that grain boundary sliding was enhanced. Consequently the rapid formation of grain boundary pores and cracks occurred

Einfluss der Carbidausscheidungen auf das Kriechverhalten von Hochtemperaturlegierungen

SIGLEAvailable from Kernforschungsanlage Juelich G.m.b.H. (KFA) (DE). Zentralbibliothek / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Improved emergency management by a loosely coupled logistic system

We investigate a robust and intelligent logistic system for emergency management where existing commercial logistic systems are loosely coupled with logistic systems of emergency management organizations and armed forces. This system is used to supply the population in case of a disaster where a high impact of environmental conditions on logistics can be seen. Very important are robustness as the ability of a logistic system to remain effective under these conditions and intelligent behavior for automated ad-hoc decisions facing unforeseen events. Scenario technique, roadmapping, as well as surveys are used as qualitative methodologies to identify current weaknesses in emergency management logistics and to forecast future development of loosely coupled logistic systems. Text mining and web mining analysis as quantitative methodologies are used to improve forecasting. As a result, options are proposed for governmental organizations and companies to enable such a loosely coupled logistic system within the next 20 years

Arbeitsbericht der Zentralabteilung Strahlenschutz 1972

The ''Zentralabteilung Strahlenschutz - ZST" (Health Physics Division) of the Nuclear Research Establishment Jülich is responsible for an adequate and a proper perfomance of the radiation protection of installations, personnel and environment. This does include the introduction of the necessary organizing conditions as well as the permanent development of the measuring methods and procedures according to the most recent knowledge of science and research. The chapters 1 to 6 of the present annual report refer to the service activities done in 1972 as well as to the results of research and developments in connection with the improvement of methods and procedures. Chapter 7 gives a complete bibliography of all the published and internal literature of the ZST in 1972