Original scientific paper

Influence of testing rate on Lüders band propagation in niobium microalloyed steel

S. Rešković ; University of Zagreb, Faculty of Metallurgy, Sisak, Croatia
I. Jandrlić ; University of Zagreb, Faculty of Metallurgy, Sisak, Croatia
F. Vodopivec ; Institute of Metals and Technology, Ljubljana, Slovenia

Abstract

Using thermal imaging camera during tensile testing of low carbon and Nb microalloyed steel influence of testing rate on start of plastic deformation was investigated. The results showed that the onset of plastic flow is significantly different in Nb steel. When testing Nb steel, above the yield point (R_eh), Lüders bands formed and no change of temperature was recorded by increase of sample stretching force. Strain rate affects the propagation velocity of Lüders bands through the deformation zone.

Keywords

microalloyed steel; thermography; plastic deformation; speed of Lüders bands

Hrčak ID:

146485

URI

https://hrcak.srce.hr/146485

Publication date:

1.4.2016.

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