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Temperaturverteilung in der Wärmeeinflußzone elektronenstrahlgeschweißter Nickel-Basislegierungen

Temperature distribution in the heat affected zone of electron beam welded nickel-base alloys
: Kunze, H.-D.; Busch, W.-B.

Deutscher Verband für Schweißtechnik e.V. -DVS-, Düsseldorf:
2. Internationale Konferenz Strahltechnik '85. Proceedings
Düsseldorf: DVS-Verlag, 1985 (DVS Berichte 99)
ISBN: 3-87155-404-9
Internationale Konferenz Strahltechnik <2, 1985, Essen>
Conference Paper
Fraunhofer IFAM ()
Mikrohaerte; Mikrostruktur; Nickelsuperlegierung(elektronenstrahlgeschweisst); Simulationsgluehung; Temperaturverteilung; Udimet 700; Wärmeeinflußzone; Waspaloy

This paper describes the precipitation behaviour in the heat-affected zone of electron beam welds, taking as example two nickel-base whose precipitation characteristics are compared. The two materials differ with respect to the method of production and also their content of precipitation phase. The wrought alloy has up to 25% precipitated phase, whereas the alloy produced by powder metallurgy has 45% in the fully age-hardened condition. Investigations of these precipitates within the heat affected zone reveals a specific correlation between particle size and their distance from the fusion line. This correlation is different for both materials. In the wrought alloy, the precipiation phase dissolves and the heat-affected zone appears soft compared to the base material. In the case of the P/M-alloy, the particles become smaller with decreasing distance from the fusion line. Therefore, the hardness first decreases slightly and than rises sharply in the vicinity of the fusion line. A correl ation between particle size and cooling rate can be determined in simulation tests, where cooling rates up to approximately 2000 K/s can be achieved. A direct measurement cycle in the heat affected zone, which is only 0.5 mm wide, cannot be reliably carried out. The temperature course in the heat-affected zone of electron beam weldments can be determined by measuring the diameter of the precipitated particles.