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Investigation of microstructural evolution and creep rupture behaviour of 9% Cr MarBN steel welds

Article dans une revue avec comité de lecture
Author
XU, X.
303590 Loughborough University
ALLEN, D.J.
303590 Loughborough University
JEPSON, M.A.E.
303590 Loughborough University
SUN, W.
407023 University of Nottingham, UK [UON]
ccBENAARBIA, Adil
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]

URI
http://hdl.handle.net/10985/19566
DOI
10.1016/j.msea.2020.139546
Date
2020
Journal
Materials Science and Engineering: A

Abstract

The weldments made from the 9-12% Cr tempered martensitic steel are associated with a complex microstructure arising from complicated thermal histories of the fusion and heat affected zones. The complicated microstructural and micro-mechanical states in these critical regions provide a challenge for the determination of creep failure mechanisms. Based on detailed metallographic examination, the microstructural distribution in the heat affected zone of the welds constructed using a recently developed 9% Cr MarBN steel, IBN-1, has been identified and classified into Equiaxed Zone (EZ), Duplex Zone (DZ) and Over-tempered Zone (OZ). Cross-weld testing performed at 650°C has revealed a significant reduction in creep life as compared to bulk material. Creep rupture has been shown to occur in the parent metal region with a ductile manner at a high stress, whereas creep rupture initiates in the DZ region in an intergranular manner at a low stress. Detailed metallographic investigation has further revealed a higher damage susceptibility in the regions along the pre-existing Prior Austenite Grain Boundaries (PAGBs). The diffusional reaustenitisation of local microstructure along the PAGBs leads to a lower strength of matrix in combination with a lack of intergranular precipitates as compared to the surrounding microstructure formed after displacive reaustenitisation.

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