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Microstructure and texture of PM2000 tubes - correlation with multiaxial creep and failure behaviour.

Wasilkowska A., Ratuszek W., Penkalla H.J., Kędzierski Z., Czyrska-Filemonowicz A.

Inżynieria Materiałowa

1998

R. XIX, nr 4

1187-1190

A relationship between the microstructure and multiaxial creep properties of PM2000 tubes is discussed. The microstructure was investigated by X-ray diffraction, optical metallography, scanning- and transmission electron microscopy (TEM). Creep properties were established at 1000 degrees centigrade under multiaxial loading. The results show a low creep ductility and intergranular failure of tubes at high temperatures, related to the microstructural and mechanical anisotropy. The development of a special pancake grain structure is seen as a factor for increasing the life time of tubes subjected to multiaxial creep.