Internal friction in a martensitic high-carbon steel

Баграмов, Р. Х.; Mari, Daniele; Benoît, W.

doi:10.1080/01418610108217165

Cited by 34 publications

(36 citation statements)

References 12 publications

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“…Meanwhile the isothermal martensitic transformation was detected by the mechanical loss peak at around -150 • C [4]. Yet it is clearly demonstrated that the evolution of microstructure and distribution of interstitial atoms in steels can be successfully detected by mechanical spectroscopy [8][9][10][11]. In this paper, the distribution of carbon atoms and structure transformation after different cryogenic treatments were studied by TEM, atom probe tomography (APT or 3-D Atom Probe) [12][13][14][15] and mechanical spectroscopy [16][17][18], to clarify the mechanism of carbon segregation in high alloy tool steels.…”

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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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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“…A few internal friction peaks were reported in high carbon tool steel (1.23 wt.%C) and in medium carbon high alloyed steel [31][32][33][34][35][36][37][38][39]. A non-thermally-activated internal friction P1 peak at 130 o C was first reported by Kê [25].…”

Section: Introductionmentioning

confidence: 99%

“…Lu [39] suggested that this peak stems from: (1) depletion of interstitial carbon due to the formation of transitional carbides or carbon segregations and abrupt decrease of the internal friction background [25,[34][35][36][37][38][39]; (2) hysteretic depinning of dislocations or twin boundaries [39]. But nevertheless the physical nature of the P1 phenomenon (referred to as the P1 maximum) is still unclear due to the large difference in alloy compositions and in the substructures of the quenched martensitic phases reported in the literature [11,[25][26][27][28][29][30][31][32][33][34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

“…Instead, the carbon content in martensite may be assessed by the internal friction background [32]. It is recalled that carbon Snoek-Köster peak is frequently observed in ferrous martensite [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] in Fe-C alloys and numerous steels.…”

Section: Introductionmentioning

confidence: 99%

“…The Snoek-Köster and dislocation-enhanced Snoek peak are used for evaluating the amount of foreign interstitial atoms and the dislocation density. It is important to emphasize that Snoek-Köster peak (or equivalently, the cold-work peak) [11][12][13][14][15][16] occurs both in deformed ferrite [11][12][13][14][15][16][17][18][19][20] and in martensite [11,[25][26][27][28][29][30][31][32][33][34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Spectroscopy Of Bearing Steel

Lü

et al. 2015

Archives of Metallurgy and Materials

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This study presents mechanical spectroscopy of bearing steel subjected to different heat treatments. A non-thermally activated maximum, P1, was found at 130°C, in quenched martensitic samples, which were austenitized at 1050°C and 860°C, and presented twin martensite microstructures. It is suggested that the mechanism of the P1 maximum, observed on the lowtemperature side of Snoek-Köster peak, is related to the change of defect configurations in twinned martensite assisted with high mobility of the solute carbon atoms under an external harmonic stress field applied during mechanical loss measurements.Keywords: Bearing steel, twin martensite, carbon atoms, mechanical spectroscopy, internal friction, Snoek-Köster peak W pracy przedstawiono wyniki badań spektroskopii mechanicznej stali łożyskowej poddanej różnej obróbce cieplnej. W hartowanych martenzytycznych próbkach, które były austenityzowane w 1050°C i 860°C, i posiadały bliźniaczą mikrostrukturę martenzytu, występuje nietermicznie aktywowane maksimum P1 przy 130°C. Sugeruje się, że mechanizm maksimum P1, które występuje na niskotemperaturowym zboczu piku Snoek-Köstera, związane jest ze zmianą konfiguracji defektów w bliźniaczym martenzycie, przy wysokiej ruchliwości atomów węgla. Maksimum P1 ujawnia się pod wpływem działania harmonicznie zmiennego zewnętrznego pola naprężeń przyłożonego do próbki w trakcie badań metodą spektroskopii mechanicznej.

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Influence of the Hot Rolling Process on the Mechanical Behaviour of Dual Phase Steel

Asadi

Palkowski

2012

EPD Congress 2012

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Internal friction in a martensitic high-carbon steel

Cited by 34 publications

References 12 publications

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

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

Mechanical Spectroscopy Of Bearing Steel

Influence of the Hot Rolling Process on the Mechanical Behaviour of Dual Phase Steel

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