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vol.16 issue4Dynamic Effects of Active Elements of Manipulators in Dynamic Inverse Problem ResolutionUse of the Roundness Parameter to Evaluate Intergranular Cavitation of Low Carbon Niobium Microalloyed Steel under Isothermal Deformation author indexsubject indexarticles search
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Información tecnológica

On-line version ISSN 0718-0764

Abstract

HURTADO, E.; GARNICA, P.  and  LOPEZ, A.. Application of the Bradawling Test to Low Carbon Niobium Microalloyed Steel. Inf. tecnol. [online]. 2005, vol.16, n.4, pp.39-44. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642005000400007.

The mechanical and microstructural characteristics of isothermal plastic deformation were determined on cylindrical samples of niobium microalloyed steel tested at high temperatures. Test temperatures were 840°C, 900°C and 960°C at crosshead speeds of 1.3 mm/min, 4.5 mm/min and 13 mm/min to a penetration depth of 8 mm. Greater resistance of the material was observed at  960°C than at 900°C and 840°C. This was related to the intergranular precipitation of niobium carbonitrides and austenite recrystallization inhibition. The bradawling test is sensitive to both recrystallization and precipitation. It is shown that the method used is a triaxial stress state test, highly symmetrical with a simple geometry, and therefore may be used as a test complementary to heated uniaxial torsion and compression testing .

Keywords : metal testing; microalloyed steel; hot deformation; bradawling test; awl; indentation.

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