Analysis of tensile test beyond the ultimate tensile strength

Elfmark, J.; Staněk, Petr

doi:10.1016/0924-0136(92)90109-6

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2004

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“…In addition to the common deformation values determined at fracture -elongation (A 5 in %) and reduction of area (1J' in %) for tensile tests and number of turns up to fracture (nt) for torsion tests -the hardening exponent (n) and exponent of sensitivity to the deformation rate (m) were evaluated for each temperature. The methodology is described in [4,5]. Table 1.…”

Section: Methodsmentioning

confidence: 99%

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Formability of High‐Alloy Dual‐Phase Cr‐Ni Steels

Elfmark

2004

steel research international

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The formability of dual-phase high-alloy Cr-Ni steel within the temperature range from 900 to 1250°C was studied using laboratory tensile and torsion tests. The dual-phase steels on 24% Cr basis are characterized by poor hot formability due to very low stable deformation values and slow recrystallization. Mathematical description of deformation stability exhaustion was derived, as well as a model of formability control based on analysis of the gradual diffuse deformation stability from the stability limit to the moment when the deformation starts to concentrate in a small volume of the test piece. Rolling simulation of dual-phase steel strip was used as an example demonstrating the draught scheme optimization technique which avoids the danger of crack occurrence during the rolling of dual-phase steel strip.

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Section: Methodsmentioning

confidence: 99%

“…The increase of the deformation force is not continuous when its stepwise curve is recorded [3]. dal dip = alp' (4) (5) Theoretical fundamentals…”

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confidence: 99%