Abstract
Recently, the third generation of advanced high strength steels (AHSSs) show promising properties for automotive applications. The improvement of macroscopic mechanical performance is not feasible without a deep understanding of the micromechanical behavior and failure micro-mechanisms involved during its response under various loading conditions. In this study, a uniaxial tensile test is conducted on a low silicon bainitic steel with second phase constituents (martensite and carbides). A comprehensive image processing on SEM micrographs is performed in order to quantify the damage evolution as a function of plastic deformation. A new methodology is examined to address the correlation between crystallographic orientation and damage initiation. In this multiphase steel, it appears that orientation dependence of damage initiation is blurred by the presence of different phases and hence there is not an obvious preferential orientation from where damage has initiated.
Highlights
In multiphase steels, it has been well studied that microstructural heterogeneities such as different phases with various mechanical contrast, play a significant role in the partitioning of stress during plastic deformation [1,2,3,4]
Jia et al have shown in a duplex stainless steel that at high macroscopic stresses when all grains in both constituent phases deform plastically, the role of the crystallographic orientation anisotropy on stress-strain partitioning is more significant than the phase contrast stresses [9]
Two characterization methods were used to study the initiation of damage within the microstructure of low silicon bainitic steel
Summary
It has been well studied that microstructural heterogeneities such as different phases with various mechanical contrast, play a significant role in the partitioning of stress (and/or strain) during plastic deformation [1,2,3,4]. Jia et al have shown in a duplex stainless steel that at high macroscopic stresses when all grains in both constituent phases deform plastically, the role of the crystallographic orientation anisotropy on stress-strain partitioning is more significant than the phase contrast stresses [9]. The role of crystallographic orientation on damage initiation at relatively high levels of plastic deformations was observed on metal-matrix [10] and rigid fiber composites [11] or alternatively in an austenitic stainless steel under the cyclic loading condition [12]. The competing effect of phase contrast, with various topologies, and crystallographic orientation on damage initiation is a frequent topic of investigation [6, 12, 13]
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