Carbon Distribution in Ferritic-Martensitic Fe-Cr-C Alloys

Konstantinović, M.J.; Minov, Boris; Renterghem, W. Van

doi:10.1590/1980-5373-mr-2017-0886

Cited by 3 publications

(3 citation statements)

References 6 publications

(9 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Addition of chromium, including variations of initial microstructure (F vs FM) and the presence of minor solutes, provokes the appearance of new relaxation process in the high-temperature MAE spectra at about 800-850 K. At the same time, by increasing the chemical complexity, all carbon-relaxation peaks become strongly suppressed, so that they become barely visible already in Fe2.5Cr alloys, see Figure 3 (they are completely gone in all other alloys-not shown to save space). These results are in a very good agreement with the IF spectra measured on the same alloys, [34] but they contradict those previously published. [35] A most straightforward interpretation for the absence of Snoek relaxation would be a scenario of entirely carbon-depleted population of interstitial sites in alloys as a result of carbide formation.…”

Section: Effects Of Chromium Initial Microstructure and Minor Solute ...supporting

confidence: 84%

Magnetic After‐Effect Study of Carbon Distribution and Grain Boundary Diffusion in FeCrC Alloys and Steels

Konstantinović

Prester

Drobac

et al. 2022

Physica Status Solidi (a)

Self Cite

View full text Add to dashboard Cite

Herein, carbon distribution and grain‐boundary diffusion processes are studied in a variety of FeCr alloys and steels with different chromium content and microstructure, based on magnetic after‐effect measurements performed in a broad temperature range, from 100 to 1000 K. The existence of three metastable carbon positions in the lattice is revealed in the FeC alloys. Carbon as interstitial in the lattice, segregated at the dislocations and grain boundaries, is represented by the relaxation peaks at about 269, 432, and 607 K, respectively. The relaxation process due to the grain‐boundary self‐diffusion is clearly distinguished from those mentioned earlier, and is observed to be at about 643 and 681 K in low and high carbon Fe, respectively. Addition of Cr has a twofold effect: a) for Cr concentrations higher than about 3 wt% carbon‐related relaxation processes completely disappear from the spectra, most probably due to formation of carbides, b) the solute grain‐boundary diffusion relaxation peak appears in the spectra at about 800 K, with an activation energy that is directly dependent on the Cr content. Activation energy of the solute grain‐boundary diffusion is found to be generally smaller in ferrite–martensite microstructure in comparison with fully ferrite alloys.

show abstract

Section: Effects Of Chromium Initial Microstructure and Minor Solute ...supporting

confidence: 84%

Magnetic After‐Effect Study of Carbon Distribution and Grain Boundary Diffusion in FeCrC Alloys and Steels

Konstantinović

Prester

Drobac

et al. 2022

Physica Status Solidi (a)

Self Cite

View full text Add to dashboard Cite

show abstract

“…The apparent experimental values fit better to the point defect relaxation, i.e., to the Snoek-type effect, while the dislocation related relaxation has slower relaxation time; The P1 effect can be also caused by reorientation of pairs of vacancies under applied cyclic stress. Similar ideas were proposed for Fe–Al [ 143 ] and Fe–Cr alloys [ 144 ]. The arguments in favor of this hypothesis are a decrease in the P1 peak effect after annealing, which leads to a drastic decrease in vacancy concentration in Fe–Ga alloys [ 22 ], and the experimental values of characteristic relaxation times, which are in favor of the point defect relaxation.…”

Section: Anelastic Effects In Binary Fe–ga and Ternary Fe–ga-based Al...mentioning

confidence: 55%

Anelastic Effects in Fe–Ga and Fe–Ga-Based Alloys: A Review

Golovin

2023

Materials

View full text Add to dashboard Cite

Fe–Ga alloys (GalFeNOLs) are the focus of attention due to their enhanced magneto-elastic properties, namely, magnetostriction in low saturation magnetic fields. In the last several years, special attention has been paid to the anelastic properties of these alloys. In this review, we collected and analyzed the frequency-, amplitude-, and temperature-dependent anelasticity in Fe–Ga and Fe–Ga-based alloys in the Hertz range of forced and free-decay vibrations. Special attention is paid to anelasticity caused by phase transitions: for this purpose, in situ neutron diffraction tests with the same heating or cooling rates were carried out in parallel with temperature dependencies measurements to control ctructure and phase transitions. The main part of this review is devoted to anelastic effects in binary Fe–Ga alloys, but we also consider ternary alloys of the systems Fe–Ga–Al and Fe–Ga–RE (RE—Rare Earth elements) to discuss similarities and differences between anelastic properties in Fe–Ga and Fe–Al alloys and effect of RE elements. We report and discuss several thermally activated effects, including Zener- and Snoek-type relaxation, several transient anelastic phenomena caused by phase transitions (D03 ↔ A2, D03 → L12, L12 ↔ D019, D019 ↔ B2, Fe13Ga9 → L12+Fe6Ga5 phases), and their influence on the above-mentioned thermally activated effects. We also report amplitude-dependent damping caused by dislocations and magnetic domain walls and try to understand the paradox between the Smith–Birchak model predicting higher damping capacity for materials with higher saturation magnetostriction and existing experimental results. The main attention in this review is paid to alloys with 17–20 and 25–30%Ga as the alloys with the best functional (magnetostriction) properties. Nevertheless, we provide information on a broader range of alloys from 6 to 45%Ga. Due to the limited space, we do not discuss other mechanical and physical properties in depth but focus on anelasticity. A short introduction to the theory of anelasticity precedes the main part of this review of anelastic effects in Fe–Ga and related alloys and unsolved issues are collected in summary.

show abstract

“…These C-V clusters can be observed by IF. [55,111] More specifically, the dissolution of the C-V clusters due to the temperature ramping during the IF measurement can result in the appearance of a relaxation peak in the IF spectrum. Konstantinovic and Malerba [55] provided a detailed analysis on how this dissolution could lead to relaxation peaks.…”

Section: The Role Of Vacanciesmentioning

confidence: 99%

The Potential of the Internal Friction Technique to Evaluate the Role of Vacancies and Dislocations in the Hydrogen Embrittlement of Steels

Vandewalle

Konstantinović

Depover

et al. 2021

steel research int.

View full text Add to dashboard Cite

Hydrogen embrittlement of steels is known to have considerable impact in many engineering sectors. To be able to mitigate the hydrogen embrittlement problem, a profound comprehension of the interaction of hydrogen with the steel microstructure is required. Especially the interaction of hydrogen with dislocations and vacancies is very relevant as these defects are known to play an important role in hydrogen embrittlement. At present, thermal desorption spectroscopy is mostly used to study hydrogen–defect interactions. However, information obtained solely by this technique is insufficient to obtain a full understanding of the interaction of hydrogen with these defects in the steel microstructure. Herein, the use of internal friction, as a complementary technique to thermal desorption spectroscopy, to reveal the interaction of hydrogen with dislocations and vacancies, is reviewed based on the present understanding in the literature. Furthermore, the opportunities to use internal friction to characterize the interaction between hydrogen and these defects and to give more insight into the hydrogen embrittlement mechanism are discussed. It is demonstrated that internal friction has not yet been used to its full potential for this purpose, although it entails the opportunity to develop fundamental insights into the hydrogen embrittlement phenomenon.

show abstract

Carbon Distribution in Ferritic-Martensitic Fe-Cr-C Alloys

Cited by 3 publications

References 6 publications

Magnetic After‐Effect Study of Carbon Distribution and Grain Boundary Diffusion in FeCrC Alloys and Steels

Magnetic After‐Effect Study of Carbon Distribution and Grain Boundary Diffusion in FeCrC Alloys and Steels

Anelastic Effects in Fe–Ga and Fe–Ga-Based Alloys: A Review

The Potential of the Internal Friction Technique to Evaluate the Role of Vacancies and Dislocations in the Hydrogen Embrittlement of Steels

Contact Info

Product

Resources

About