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soft-ferrite
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The effect of dynamic strain aging on fatigue properties of dual phase steels with different martensite morphology
, Article Materials Science and Engineering A ; Volume 527, Issue 1-2 , 2009 , Pages 235-238 ; 09215093 (ISSN) ; Ekrami, A ; Sharif University of Technology
Abstract
Dual phase (DP) steels with network and fibrous martensite were produced by intercritical annealing heat treatment cycles. Some of these steels were deformed at dynamic strain aging temperatures. Room temperature tensile tests of specimens deformed at 300 °C showed that both yield and ultimate tensile strengths for both morphologies increased, while total elongation decreased. Fatigue test results before and after high temperature deformation showed that dynamic strain aging has a stronger effect on fatigue properties of dual phase steels with fibrous martensite. Cracks in DP steels with fibrous martensite propagate in a tortuous path in soft ferrite phase, while they pass of both hard and...
An investigation to effective parameters on the damage of dual phase steels by acoustic emission using energy ratio
, Article World Academy of Science, Engineering and Technology ; Volume 46 , 2010 , Pages 638-643 ; 2010376X (ISSN) ; Khamedi, R ; Sharif University of Technology
2010
Abstract
Dual phase steels (DPS)s have a microstructure consisting of a hard second phase called Martensite in the soft Ferrite matrix. In recent years, there has been interest in dual-phase steels, because the application of these materials has made significant usage; particularly in the automotive sector Composite microstructure of (DPS)s exhibit interesting characteristic mechanical properties such as continuous yielding, low yield stress to tensile strength ratios(YS/UTS), and relatively high formability; which offer advantages compared with conventional high strength low alloy steels(HSLAS). The research dealt with the characterization of damage in (DPS)s. In this study by review the mechanisms...