“…The 200 K temperature increase in high Mn steels is generally reported to increase the stacking fault energy by approximately 10 mJ/m 2 , 4,5,29,30) indicating that the calculated stacking fault energy shows good agreement with that of conventional reports. …”
Section: Deformation Temperature and Tensile Orientationsupporting
In a previous study, the carbon concentration dependence of the deformation twinning behavior in twinning-induced plasticity steels was investigated, which clarified that the deformation twin fraction in the < 144 > tensile orientation did not change with the carbon concentration. In this study, twinning deformation occurred in the Fe-18Mn-1.2C steel at 473 K with a relatively high stacking fault energy of 55 mJ/m 2 . To explain these experimental results, dynamic strain aging of Shockley partials dislocations was proposed as an additional contributing factor to assist the deformation twinning in high-carbon-added austenitic steels. Most abnormalities concerning deformation twinning such as the high stacking fault energy in Fe-Mn-C austenitic steels were interpreted by considering the effect of dynamic strain aging.KEY WORDS: deformation twinning; dynamic strain aging; austenitic steel; electron backscatter diffraction (EBSD).
“…The 200 K temperature increase in high Mn steels is generally reported to increase the stacking fault energy by approximately 10 mJ/m 2 , 4,5,29,30) indicating that the calculated stacking fault energy shows good agreement with that of conventional reports. …”
Section: Deformation Temperature and Tensile Orientationsupporting
In a previous study, the carbon concentration dependence of the deformation twinning behavior in twinning-induced plasticity steels was investigated, which clarified that the deformation twin fraction in the < 144 > tensile orientation did not change with the carbon concentration. In this study, twinning deformation occurred in the Fe-18Mn-1.2C steel at 473 K with a relatively high stacking fault energy of 55 mJ/m 2 . To explain these experimental results, dynamic strain aging of Shockley partials dislocations was proposed as an additional contributing factor to assist the deformation twinning in high-carbon-added austenitic steels. Most abnormalities concerning deformation twinning such as the high stacking fault energy in Fe-Mn-C austenitic steels were interpreted by considering the effect of dynamic strain aging.KEY WORDS: deformation twinning; dynamic strain aging; austenitic steel; electron backscatter diffraction (EBSD).
“…All alloying elements that used in this calculation decreased the ratio of stable and unstable SFE of pure Co. Then, it has an increasing impact on the emission of partial dislocations. TEM studies of pure Co and some Cobased alloys 1,8,9,15 have observed a significant amount of extended partial dislocations, confirmed the calculations in the present study and also demonstrate the role of first-principles calculations for making predictions of the structural modeling. Ranking of the binary Co-X alloys can be ordered in the sequence as shown in Fig.…”
Section: Co-based Alloy Design Based On First-principles Calculationssupporting
confidence: 74%
“…Alloying with the transition and rare-earth metals are widely used in Mg-alloys that can significantly improve the mechanical properties, especially the addition of rare-earth metals 7 . Certain alloying elements could significantly change the SFE from the experiments or theoretical simulation, for example, Co-Fe, Co-Ni and Co-Ni-Cr based alloy 8,9 , but it is still insufficient for Co-based alloys. A theoretical SFE calculation, such as first-principles and thermodynamic method, is an effective method to discover the effect of various elements on the SFE and the mutual correlations between the elements 10 .…”
“…The inaccuracy of the existing relationships is reflected in the inconsistent coefficients proposed for alloying elements [2,6]. Although SFE appears, based on the existing empirical relationships, to have a complex dependence on the chemical composition, it is unanimously known to increase at higher temperatures [7]. The associated changes in the glide mode have important consequences for the deformed microstructures obtained at different temperatures; the wide separation of a/6 <112> Shockley partial dislocations at low temperatures, where the SFE is low, promotes the planar glide of dislocations, for instance by restricting the cross-slip of screw dislocations.…”
Section: Relationship Between the Stacking Fault Energy (Sfe) And Defmentioning
The temperature dependence of tensile elongation in austenitic steels is discussed in view of the relationship between the stacking fault energy and deformation-induced processes. It is shown that the maximum tensile elongation is achieved in the vicinity of M d γ → α′ temperature. The influence of alloying elements on the temperature dependence of tensile elongation can therefore be analyzed with regard to their influence on the M d γ → α′ temperature. In this regard, majority of alloying elements including C and N decrease the temperature associated with highest tensile elongation. Due to the high efficiency of C and N in increasing the stability of austenite, approaches toward the development of high-interstitial austenitic stainless steels containing minimal amounts of substitutional alloying elements are discussed. Finally, some of the challenges associated with the processing of high-interstitial austenitic stainless steels are reviewed.
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