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Información tecnológica

On-line version ISSN 0718-0764

Abstract

HURTADO, E.; GARNICA, P.  and  LOPEZ, A.. Use of the Roundness Parameter to Evaluate Intergranular Cavitation of Low Carbon Niobium Microalloyed Steel under Isothermal Deformation. Inf. tecnol. [online]. 2005, vol.16, n.4, pp.45-51. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642005000400008.

Hot tensile tests were carried out on low-carbon niobium microalloyed steel at four temperatures: 640°C, 840°C, 900°C and 960°C, for  crosshead speeds of 1.35 mm/min and 13.5 mm/min in order to evaluate cavity formation behavior during isothermic deformation. After fracture in a hot tensile test,  transverse sample sectioning allowed the evaluation of shape and size of cavities formed during the test using optical microscopy and image analysis. In both cases zigzag shaped cavities were observed at 900°C, a temperature within the range of the lowest ductility for this steel under uniaxial tensile load conditions. It was found that cavities formed at 1.35 mm/min  at this temperature were greater in size, and had a lower relative value for the roundness parameter.

Keywords : intergranular cavitation; isothermal deformation; cavity nucleation; roundness parameter.

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