| Numéro |
J. Phys. IV France
Volume 123, March 2005
|
|
|---|---|---|
| Page(s) | 111 - 115 | |
| DOI | https://doi.org/10.1051/jp4:2005123018 | |
J. Phys. IV France 123 (2005) 111-115
DOI: 10.1051/jp4:2005123018
A study of the high temperature tensile properties of an Fe-Ni alloy
G. Saindrenan1, M.T. Simonetta-Perrot1, R. Le Gall1 and R. Louahdi21 École Polytechnique de l'Université de Nantes, Rue Christian Pauc-La Chantrerie, BP. 50609, 44306 Nantes Cedex 3, France
2 Département d'Optique et de Mécanique de Précision, Faculté des Sciences de l'Ingénieur, Université Ferhat Abbas, Sétif 19000, Algérie
Abstract
Tensile tests carried out at different temperatures on Fe-Ni
alloys with different sulphur contents revealed a marked drop in ductility
in the temperature range 600
C to 1000C. The presence of manganese
was found to reduce the loss of ductility. The morphology of the fracture
surface revealed smooth intergranular failure in the most severe cases and
failures showing local indications of ductility (dimples) for the less
severe cases. The behaviour is explained in terms of sulphur segregation to
the grain boundaries and the action of Mn is related to the formation of MnS
precipitates which hinder segregation of free sulphur. The presence of
nitride formers such as Boron and aluminium was found to have a detrimental
effect if these elements are in their combined form (i.e., nitrides) and a
beneficial effect if they are in their free atomic form. This behaviour is
related to the formation and dissolution of BN and AlN precipitates.
© EDP Sciences 2005