Low temperature friction stir welding of P91 steel

Low temperature friction stir welding of P91 steel

Bead-on-plate friction stir welds were made on P91 alloy with low and high rotational speeds（100 and 1000 RPM） to study their effects on weld microstructural changes and impression creep behavior. Temperatures experienced by the stir zone were recorded at the weld tool tip. Different zones of welds...

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Veröffentlicht in:Defence Technology（防务技术） 2016-08, Vol.12 (4), p.285-289
Hauptverfasser: Kalvala, Prasad Rao, Akram, Javed, Misra, Mano, Ramachandran, Damodaram, Gabbita, Janaki Ram
Format: Artikel
Sprache:eng
Schlagworte:
Arc welding
Carbides
creep
Defence technology
Ferritic stainless steels
Friction
Friction stir welding
Fusion welding
Heat resistant steels
Impression creep
Low temperature
Martensite
Microstructure
P91
Steels
stir
temperature
Martensite
Carbides
Impression
Welded joints
welding
P91
Low
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Beschreibung
Zusammenfassung:Bead-on-plate friction stir welds were made on P91 alloy with low and high rotational speeds（100 and 1000 RPM） to study their effects on weld microstructural changes and impression creep behavior. Temperatures experienced by the stir zone were recorded at the weld tool tip. Different zones of welds were characterized for their microstructural changes, hardness and creep behavior（by impression creep tests）. The results were compared with submerged arc fusion weld. Studies revealed that the stir zone temperature with 100 RPM was well below Ac1 temperature of P91 steel while it was above Ac3 with 1000 RPM. The results suggest that the microstructural degradation in P91 welds can be controlled by low temperature friction stir welding technique.
ISSN:2214-9147
2214-9147
DOI:10.1016/j.dt.2015.11.003