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|Title: ||The effect of long term ageing on the autogenous welding of dissimilar austenitic stainless steels|
|Authors: ||Jackson, Charles P.|
Higginson, Rebecca L.
Hogg, Simon C.
|Issue Date: ||2015|
|Citation: ||JACKSON, C.P. ... et al., 2015. The effect of long term ageing on the autogenous welding of dissimilar austenitic stainless steels. IN: Proceedings of the 8th European Stainless Steel and Duplex Stainless Steel Conference and Exhibition, Graz, Austria, Austria, pp. 77 - 86.|
|Abstract: ||Austenitic stainless steels are used extensively throughout power stations in high
temperature applications such as superheater tubes and fuel rod guides. For these
applications, welding is often required to join sections of components or pipes/tubes due to
their large sizes and lengths.
In this paper, samples of a cast niobium stabilised stainless steel welded to a wrought 321
stainless steel were investigated. The sections were joined together using an autogenous
Tungsten Inert Gas (TIG) weld. The effects of long term ageing at 750°C for up to 4000
hours have been studied. The ageing treatments were conducted in an inert atmosphere.
Compositional changes and precipitates have been investigated using SEM with EDX and
EBSD analysis. Niobium dissolved completely into the weld melt however it is observed to
precipitate back out during long term ageing. Titanium carbonitrides however remained intact
during the welding process, creating agglomerated particles throughout the weld bead.
Ageing above 100 hours causes further Nb rich MX precipitates to form, which coarsen with
longer ageing times up to 4000 hours.|
|Description: ||This is a conference paper.|
|Sponsor: ||The authors would like to thank EDF energy for supplying the material for this study.
Thanks also go to EDF Energy and the ESPRC for funding this work.|
|Version: ||Accepted for publication|
|Appears in Collections:||Conference Papers and Presentations (Materials)|
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