Chemische Zusammensetzung und Kristallstruktur von Sondercarbiden in warmfesten Cr-Mo- und Cr-Mo-V-Stählen

Abstract

Mitteilung aus dem Forschungsinstitut der Mannesmann AG Bericht Nr. 2009 des Werkstoffausschusses des Vereins Deutscher Eisenhiittenleute*) Entwicklung eines Probentisches, mit dessen Hilfe Untersuchungen von saumforrniqen Sondercarbideutektoiden warmfester Cr-Mo-und Cr-Mo-V-Stahle sowie einiger Versuchsschmelzen durchgefiihrt wurden. Bestimmung von Gitterkonstanten. Chemical composition and crystal structure of special carbides in creep resistant Cr-Mo and Cr-Mo-V steels Development of a stage for the examination of fringe-type alloy-carbide eutectoids in creep resistant Cr-Mo and Cr-Mo-V steels as well as of experimental casts. Deterrriination of lattice constants. Composition chimique et structure cristalline de carbures speclaux en aciers au Cr-Mo et au Cr-Mo-V resistants au fluage Developpernent d'une table pour I'examen d' eutecto"ides de carbures speciaux en forme de frange d'aciers au Cr-Mo et au Cr-Mo-V resistants au fluage et de coulees experimentales, Determination de constantes reticulalres.

Microstructural investigation of a rapidly solidified 12Cr-Mo-V steel

“…A montage of cross sections, together with a plane view micrograph of zone A taken by TEM, is presented in Figure 5. The relationship between the measured SDAS and the cooling rate could be described by [24] ⅐ Ϫn SDAS ϭ B ⅐ T [3] where B ϭ 54.38 m K n s Ϫn and n ϭ 0.33. The cell morphology in zone B is shown in Figure 6.…”

“…The ferrite, on the other hand, is found to appear at the upper side of the ribbon in zones B and C as a fine cellular or dendrite structure. [3] remains valid for high cooling rates, the cooling rates were estimated to be (0.9 to 2.9) ϫ 10 6 K s Ϫ1 in zone C. The phase distributions in the bulk and at the surface of the samples have been investigated using TMS and XRD, respectively. The structure of the dark ''features'' observed at the triple grain boundaries and in some of the cell walls was not identified; however, chemical analysis indicates that these features are rich in chromium.…”

The Influence of Tempering Conditions on Microstructure and Carbide Formation in 0.3C–1.1Mn–0.3Mo–0.2Cr Steel

“…Carbide particles in steels are usually characterized through their crystallography, chemical composition, size, morphology, and distribution [1][2][3]. To determine the chemical composition of the carbide metallic constituent (M), energy dispersive xray spectroscopy (EDX) along with transmission electron microscopy (TEM) is mainly used [2][3][4][5][6].…”

“…(1) chemical composition of the steel [1,7], (2) heat treatment (microstructure) [8,9], and (3) service conditions (temperature, stress, environment, etc.) [10,11].…”