1. Ferrite content measurement
1.1 Ferrite characteristics
The ferrite considered is the remaining δ-ferrite that has not regressed to austenite after the solidified molten metal has cooled.
This minority phase in the austenitic matrix is subject to variations in quantity, form, composition, distribution and orientation in the cross-section and length of the molten zone. Moreover, as it remains in a metastable state, it is susceptible to transformation.
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From a macroscopic point of view
The ferrite content will vary locally if the dilution is modified, if gammagenic atmospheric nitrogen is introduced during welding (welder's skill, lack of protection) and if the thermal cycle is modified.
Indeed,...
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Ferrite content measurement
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Bibliography
References
Standardization
International standard
- Soudage - Détermination de l'Indice de Ferrite (FN) dans le métal fondu en acier inoxydable austénitique et duplex ferritique-austénitique au chrome-nickel. - NF EN ISO 8249 - (2000), deuxième édition
American standard
- Standard procedures for calibrating magnetic instruments to measure the delta ferrite content of austenitic and duplex ferritic-austenitic stainless steel...
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