ENGEMASA Engineering and Materials Ltda.

São Carlos, Brazil

ENGEMASA Engineering and Materials Ltda.

São Carlos, Brazil
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Andrade A.R.,Federal University of São Carlos | Andrade A.R.,ENGEMASA Engineering and Materials Ltda. | Bolfarini C.,Federal University of São Carlos | Ferreira L.A.M.,ENGEMASA Engineering and Materials Ltda. | And 4 more authors.
Materials Science and Engineering A | Year: 2015

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. © 2015 Elsevier B.V.


Andrade A.R.,Federal University of São Carlos | Andrade A.R.,ENGEMASA Engineering and Materials Ltda. | Bolfarini C.,Federal University of São Carlos | Ferreira L.A.M.,ENGEMASA Engineering and Materials Ltda. | And 5 more authors.
Materials Science and Engineering A | Year: 2015

The influence of niobium addition on the mechanical properties at high temperature of HP alloy has been investigated. Two HP alloys were centrifugally cast with a similar chemical composition differing only in the niobium content. Low strain rate high temperature tensile tests and creep-rupture tests were performed in the range of 900-1100. °C, and the results compared between the alloys. According to the results, the high temperature mechanical behavior of both alloys is controlled by several factors like solid solution, network of eutectic carbides, intradendritic precipitation and dendrite spacing. A significant increase in the mechanical properties for the HP alloy with niobium addition was found within the temperature range of 900-1050. °C. Beyond this temperature the mechanical behavior of both alloys is basically the same. © 2015 Elsevier B.V.

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