The influence of isothermal ageing and subsequent hydrogen charging at room temperature on local mechanical properties and fracture characteristics of martensitic-bainitic weldments for power engineering
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...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Belgrade, Technical Faculty, Bor
2017-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2017/1450-53391700033F.pdf |
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| Summary: | 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 postweld 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 behaviour. |
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| ISSN: | 1450-5339 2217-7175 |