Internal friction in martensitic carbon steels

Hoyos, John Jairo; Ghilarducci, A.A.; Salva, H.R.; Chaves, César; Vélez, Juan Manuel

doi:10.1016/j.msea.2008.09.088

Cited by 16 publications

(25 citation statements)

References 6 publications

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“…The amplitude enhancement is related to the stress-induced movement of nonscrew dislocations in an atmosphere of interstitial carbon atoms. Peaks at temperatures close to that of peak P3 have also been reported for quenched high-carbon martensite by Bagramov et al [26] and Hoyos et al [40] They attributed the origin of this peak to carbide formation. Peak P2 is the result of the interaction between nonscrew-type dislocations and interstitial carbon atoms.…”

Section: Internal Frictionsupporting

confidence: 66%

On the Processing of Martensitic Steels in Continuous Galvanizing Lines: Part 1

Song

Kwak

Cooman

2011

Metall Mater Trans A

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Whereas low-carbon (<0.2 mass pct) martensitic grades can be produced easily in continuous annealing processing lines equipped with the required cooling capacity, the thermal cycles in continuous galvanizing lines make it difficult to produce hot-dip Zn or Zn-alloy coated highstrength martensitic grades. This is because of the tempering processes occurring during dipping of the strip in the liquid Zn bath and, in the case of galvannealed sheet steel, the short thermal treatment required to achieve the alloying between the Zn and the steel. These short additional thermal treatments last less than 30 seconds but severely degrade the mechanical properties. Using a combination of internal friction, X-ray diffraction, and transmission electron microscopy, it is shown that the ultrafine-grained lath microstructure allows for a rapid dislocation recovery and carbide formation during the galvanizing processes. In addition, the effective dislocation pinning occurring during the galvannealing process results in strain localization and the suppression of strain hardening.

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Section: Internal Frictionsupporting

confidence: 66%

On the Processing of Martensitic Steels in Continuous Galvanizing Lines: Part 1

Song

Kwak

Cooman

2011

Metall Mater Trans A

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“…The amounts of interstitial carbon in the martensitic matrix for steels A and B were estimated to be 0.40 and 0.47 wt.%, respectively, from the XRD results [3]. This suggests that carbon atoms are segregated to the strain fields of dislocations during quenching.…”

Section: Introductionmentioning

confidence: 97%

“…In previous works [2,3], correlations between the internal friction and the microstructure of two steels containing 0.626 and 0.71 wt.% carbon are proposed (A and B steels, respectively). These steels were quenched into water and tempered for 10 min at 423, 573 and 723 K. The microstructure characterization [2,3] made possible to distinguish three stages of structural changes during tempering: (I) the formation of epsilon carbide, (II) the transformation of retained austenite and (III) the formation of cementite.…”

Section: Introductionmentioning

confidence: 99%

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Effects of tempering on internal friction of carbon steels

Hoyos

Ghilarducci

Salva

et al. 2011

Materials Science and Engineering: A

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“…However, the underlying mechanism of diffusion of carbon atoms and the carbide precipitation caused by cryogenic treatment has not been clarified yet. Hoyos et al [5,6] studied the internal friction in martensitic carbon steels under the sub-zero temperature. The analysis of internal friction spectra indicated that mechanical loss peaks observed in the sub-zero temperature are related to the interactions between dislocations, carbon atoms and carbides.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation Of Segregation Of Carbon Atoms Due To Sub-Zero Cryogenic Treatment In Cold Work Tool Steel By Mechanical Spectroscopy And Atom Probe Tomography

Min

Xie

et al. 2015

Archives of Metallurgy and Materials

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In this work, we present mechanical spectroscopy of cold work tool steel subjected to sub-zero cryogenic soaking treatment to reveal the carbon segregation and the subsequent carbides refinement. The maximum of Snoek-Köster (SK) peak height was obtained in the sample subjected to soaking 1h at -130 • C cryogenic treatment. The SK peak height is reduced with prolonging the soaking time. The results indicate that an increase in the height of SK peak is connected with an increase in dislocation density and the number of segregated carbon atoms in the vicinity of dislocations or twin planes after martensite transformation at -130 • C which is confirmed by corresponding TEM and atom probe tomography measurement. Hence, it is suggested that the isothermal martensite, formed during the cryogenic soaking treatment decreases (APT) the height of SK peak.Keywords: Cryogenic treatment, isothermal martensite, atom probe tomography, mechanical spectroscopy, Cottrell atmosphere W pracy przedstawiono wyniki spektroskopii mechanicznej stali narzędziowej do pracy na zimno poddanej obróbce kriogenicznej w celu odsłonięcia segregacji węgla i późniejszego tworzenia węglików. Dzięki połączeniu transmisyjnej mikroskopii elektronowej (TEM) i tomografii atomowej (APT) uzyskano maksymalny pik Snoek-Köstera (SK) w próbce poddanej obróbce kriogenicznej przez 1 godzinę w -130 • C. Wysokość piku SK obniża się wraz z wydłużeniem czasu obróbki. Wyniki wskazują, że zwiększenie wysokości piku SK jest połączone ze wzrostem gęstości dyslokacji i liczby segregowanych atomów węgla w sąsiedztwie dyslokacji lub płaszczyzn bliźniaczych po przemianie martenzytycznej w -130 • C, co potwierdzone jest odpowiednimi pomiarami TEM oraz APT. W związku z tym proponuje się, że izotermiczny martenzyt powstały podczas obróbki kriogenicznej zmniejsza wysokość piku SK.

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Internal friction in martensitic carbon steels

Cited by 16 publications

References 6 publications

On the Processing of Martensitic Steels in Continuous Galvanizing Lines: Part 1

On the Processing of Martensitic Steels in Continuous Galvanizing Lines: Part 1

Effects of tempering on internal friction of carbon steels

Experimental Investigation Of Segregation Of Carbon Atoms Due To Sub-Zero Cryogenic Treatment In Cold Work Tool Steel By Mechanical Spectroscopy And Atom Probe Tomography

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