Long-term thermal degradation of narrow gap orbital welded P91 and P92 steels

Abstract

This paper deals with an evaluation of mechanical properties and microstructures of similar and dissimilar narrow gap orbital welds of martensitic steels P91 and P92 after long-term laboratory ageing at elevated temperatures (650, 675 and 700 °C, 5000 to 30 000 h). Conclusions of this assessment are the kinetic dependencies of structural and mechanical properties changes during long-term exposure to high temperatures.