THE INFLUENCE OF ISOTHERMAL AGEING AND HYDROGEN CHARGING ON LOCAL MECHANICAL PROPERTIES AND FRACTURE MANIFESTATIONS OF MARTENSITIC/BAINITIC WELDMENTS FOR POWER ENGINEERING
Abstract
The present study deals with the effects of high temperature expositions and subsequent cathodic hydrogen charging of dissimilar martensitic/bainitic weldment on its local mechanical properties and fracture behaviour at room temperature. Circumferential welded joint under investigation was produced by tungsten inert gas welding of X10CrWMoVNb9-2 martensitic and 7CrMoVTiB10-10 bainitic steels tubes with Ni-based filler metal and the application of subcritical post-weld heat treatment. Hardness profile measurements revealed pronounced hardness peaks in over-heated regions of the individual steels heat-affected zones which remained preserved also during subsequent expositions at 600 °C for up to 5000 hours. Gradual microstructural degradation of these regions included precipitate coarsening and the formation of new secondary phases during thermal exposure. The combined effects of thermal and hydrogen embrittlement of the studied weldment resulted in deleterious effects on its tensile and fracture performance. However, it has been indicated that with increasing ageing time, the hydrogen embrittlement tendency was reduced as a result of hydrogen trapping effects at newly-formed particle/matrix interfaces.
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