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Effect of ferrite volume fraction on work hardening behavior of high bainite dual phase (DP) steels
, Article Materials Science and Engineering A ; Volume 477, Issue 1-2 , 2008 , Pages 306-310 ; 09215093 (ISSN) ; Ekrami, A ; Sharif University of Technology
2008
Abstract
AISI 4340 steel was heated to 910 °C for 1 h then directly transferred to 750 °C and intercritically annealed for different times to obtain different ferrite volume fractions and then isothermally held at 350 °C for 40 min followed by air cooling to room temperature. Samples of these steels with dual phase ferrite-bainite structure were tensile tested at room temperature. The tensile flow stress data for this steel with different ferrite volume fraction was analyzed in term of Hollomon equation. It is seen that the two Hollomon equations can describe the flow behavior adequately and found that the work hardening takes place in two stages which each equation belong to the one of work...
Effect of temperature on flow and work hardening behavior of high bainite dual phase (HBDP) steels
, Article Materials Science and Engineering A ; Volume 475, Issue 1-2 , 2008 , Pages 293-298 ; 09215093 (ISSN) ; Ekrami, A ; Sharif University of Technology
2008
Abstract
High bainite dual phase steel has been subjected to tension test at different temperatures from 25 to 500 °C with strain rate of 4.6 × 10-4 s-1 to investigate the effect of temperature on its mechanical properties. Stress-strain curves of steels showed serration flow at temperature range of 200-350 °C and smooth flow at the other temperatures. In agreement with previous studies on some steels, peaks in the variations of yield strength (YS) and ultimate tensile strength (UTS) and minima in ductility were observed at temperature range of 200-350 °C which are various manifestations of dynamic strain aging (DSA). It has been also found that ferrite volume fraction has no effect on the...