In-situ EBSD study of deformation behavior of retained austenite in a low-carbon quenching and partitioning steel via uniaxial tensile tests

Investigation of Test Parameters on EBSD Analysis of Retained Austenite in TRIP and Pipeline Steels

“…Furthermore, the EBSD method can not only provide the content of retained austenite (see Table 9), but also provides its morphology, distribution and grain size (see Figure 13). Therefore, EBSD is a comprehensive method in the analysis of retained austenite in steel, which has been already confirmed by the previous studies from Zhang et al [18], Godet et al [19], Lomholt et al [20], Nakajima et al [21] and Li et al [22].…”

“…Both standards have some limitations in the process of use: Firstly, the measured result is greatly affected by the crystallographic orientation or texture in steel [15][16][17]; secondly, the shape and distribution of retained austenite cannot be characterized; thirdly, the lower detection limit is high (1% or more [14]) and the trace retained austenite cannot be measured by the XRD method. Considering the limitations of the XRD method, EBSD method is a good solution to perform the quantitative analysis of retained austenite in steel [18][19][20][21][22]. Firstly, the EBSD method is not influenced by the crystallographic orientation or texture in steel.…”

Site-specific atomic-scale characterisation of retained austenite in a strip cast TRIP steel

“…The resistance of RA transformation to martensite, namely its stability, is a key factor for mechanical property control [3][4][5][6]. Therefore, the RA stability has been intensely studied with respect to its carbon (C) content [2,7], morphology [5], size [8], orientation [9,10] and neighbouring phases [11,12] using step-wise straining electron backscattering diffraction (EBSD) [8], electron probe microanalysis [13], neutron diffraction [14], synchrotron X-ray diffraction [15,16], transmission electron microscopy (TEM) and atom probe tomography (APT) [17,18]. The general results can be summarised as follows.…”

“…Third, an increase in the RA grain size leads to early transformation due to availability of a greater number of martensite nucleation sites (such as slip steps and stacking faults) [8]. Fourth, when the RA exhibits an orientation facilitating its deformation, it will result in an early RA-to-martensite transformation [9,10,21]. Lastly, there is contradictory evidence with respect to the effect of neighbouring phases on the RA stability.…”

Superior Mechanical Properties and Work-Hardening Ability of Ultrafine-Grained Quenched and Partitioned Steels Processed by a Novel Approach Involving Asymmetric Hot Rolling

“…Quenching and partitioning (Q&P) steel has been the focus in recent years to obtain excellent a combination of strength and plasticity [1][2][3]. Mechanical properties of Q&P steel are related to the work-hardening (WH) rate induced by austenite-to-martensite transformation during deformation [3][4][5][6]. The quantity and stability of the retained austenite (RA) in Q&P steels plays an important role, which depends not only on the chemical composition and heat treatment, but also on the original microstructure prior to the Q&P process.…”