Titanium micro addition in a centrifugally cast HPNb alloy: High temperature mechanical properties

The influence of titanium micro addition on the mechanical properties at high temperature of HPNb alloy has been investigated. Two seamless tubes were centrifugally cast with a Ti micro addition being the major difference between them. Hot tensile and creep rupture tests were performed in the range...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2015-06, Vol.636, p.48-52
Main Authors: Andrade, A.R., Bolfarini, C., Ferreira, L.A.M., Souza Filho, C.D., Bonazzi, L.H.C.
Format: Article
Language:English
Subjects:
Alloying additive
Centrifugal cast
Centrifugal casting
Creep (materials)
Heat resistant alloy
High temperature mechanical properties
HP alloy
Materials science
Mechanical properties
Rupture tests
Tensile tests
Titanium
Titanium addition
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Summary:The influence of titanium micro addition on the mechanical properties at high temperature of HPNb alloy has been investigated. Two seamless tubes were centrifugally cast with a Ti micro addition being the major difference between them. Hot tensile and creep rupture tests were performed in the range of 900–1100°C combining different strain rates and stresses, respectively. The Ti micro addition in the HPNb alloy decreases the mechanical resistance in the hot tensile tests, but increases considerably the time to rupture and ductility in creep properties. Solid solution, carbide formation and precipitation play important roles controlling these properties. A change in the fracture mode associated with a change in the creep mechanism was reported for both alloys.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2015.03.085