Impact of Metastable Austenite on the Wear Resistance of Tool Steel

Малинов, Л. С.; Malinov, V. L.; Burova, D. V.

doi:10.3103/s1068366618040098

Cited by 7 publications

(4 citation statements)

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“…Unstable austenite has high wear resistance in abrasive wear conditions [ 28 , 29 , 40 , 41 , 42 , 43 , 44 ]. This is due to mechanically induced martensite that appears from austenite on the surface during abrasive wear.…”

Section: Resultsmentioning

confidence: 99%

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Microstructure and Properties of Heat Affected Zone in High-Carbon Steel after Welding with Fast Cooling in Water

et al. 2020

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The purpose of the research was to obtain an arc welded joint of a preliminary quenched high-carbon wear resistant steel without losing the structure that is previously obtained by heat treatment. 120Mn3Si2 steel was chosen for experiments due to its good resistance to mechanical wear. The fast cooling of welding joints in water was carried out right after welding. The major conclusion is that the soft austenitic layer appears in the vicinity of the fusion line as a result of the fast cooling of the welding joint. The microstructure of the heat affected zone of quenched 120Mn3Si2 steel after welding with rapid cooling in water consists of several subzones. The first one is a purely austenitic subzone, followed by austenite + martensite microstructure, and finally, an almost fully martensitic subzone. The rest of the heat affected zone is tempered material that is heated during welding below A1 critical temperature. ISO 4136 tensile tests were carried out for the welded joints of 120Mn3Si2 steel and 09Mn2Si low carbon steel (ASTM A516, DIN13Mn6 equivalent) after welding with fast cooling in water. The tests showed that welded joints are stronger than the quenched 120Mn3Si2 steel itself. The results of work can be used in industries where the severe mechanical wear of machine parts is a challenge.

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Section: Resultsmentioning

confidence: 99%

“…Instable austenite is able to transform into mechanically induced martensite during low-cycle fatigue wear. Thus, the wear resistance of the austenitic core will be greater than that for martensitic layers [ 28 , 29 , 40 , 41 , 42 , 43 , 44 ]. Nevertheless, the wear resistance of martensitic layers would be satisfactory as well.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Properties of Heat Affected Zone in High-Carbon Steel after Welding with Fast Cooling in Water

et al. 2020

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“…The pulsed-plasma high-Cr coating showed an increased abrasive wear resistance due to the synergetic interaction of M 7 C 3 carbides with martensite–austenite matrix, in which austenite grains might perform a TRIP effect under abrasion [ 7 , 57 ]. The volume fraction of carbides (about 50 vol.%) was notably higher than that of the EAPA cathode (28 wt.% Cr cast iron).…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the Microstructure, Tribological Characteristics, and Crack Behavior of a Chromium Carbide Coating Fabricated on Gray Cast Iron by Pulsed-Plasma Deposition

et al. 2021

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The structural and tribological properties of a protective high-chromium coating synthesized on gray cast iron by air pulse-plasma treatments were investigated. The coating was fabricated in an electrothermal axial plasma accelerator equipped with an expandable cathode made of white cast iron (2.3 wt.% C–27.4 wt.% Cr–3.1 wt.% Mn). Optical microscopy, scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction analysis, microhardness measurements, and tribological tests were conducted for coating characterizations. It was found that after ten plasma pulses (under a discharge voltage of 4 kV) and post-plasma heat treatment (two hours of holding at 950 °C and oil-quenching), a coating (thickness = 210–250 µm) consisting of 48 vol.% Cr-rich carbides (M7C3, M3C), 48 vol.% martensite, and 4 vol.% retained austenite was formed. The microhardness of the coating ranged between 980 and 1180 HV. The above processes caused a gradient in alloying elements in the coating and the substrate due to the counter diffusion of C, Cr, and Mn atoms during post-plasma heat treatments and led to the formation of a transitional layer and different structural zones in near-surface layers of cast iron. As compared to gray cast iron (non-heat-treated and heat-treated), the coating had 3.0–3.2 times higher abrasive wear resistance and 1.2–1208.8 times higher dry-sliding wear resistance (depending on the counter-body material). The coating manifested a tendency of solidification cracking caused by tensile stress due to the formation of a mostly austenitic structure with a lower specific volume. Cracks facilitated abrasive wear and promoted surface spalling under dry-sliding against the diamond cone.

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“…несколько избыточной является система легирования Х3Г3. Таким образом, для разработки промышленного состава с экономических позиций необходимо несколько снизить содержание основных легирующих элементов, а также изыскать режимы термической обработки, обеспечивающие необходимый уровень ударной вязкости (KCV) путем закалки из межкритического интервала температур (МКИТ) [6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionunclassified

The Study of Transformations, Structure and Properties of Steel 12kh3g2мfs After Quenching From Inter-Critical Temperature Interval

Poduzov¹,

Simonov²,

Yurchenko³

2019

PNIPU

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Исследованы превращения, структура и механические свойства разработанной системно-легированной безникелевой низкоуглеродистой марки стали 12Х3Г2МФС после ее полной аустенитизации при 920 °С и после нагрева в межкритическом интервале температур в диапазоне от 800 до 860 °С, с последующим контролируемым охлаждением со скоростями охлаждения от 100 до 0,05 °С/с. Построены дилатометрические кривые превращений переохлажденного аустенита для марки стали 12Х3Г2МФС. Определены критические точки фазовых превращений после полной аустенитизации и после нагрева в область МКИТ. Установлены отличительные особенности протекания фазовых превращений (мартенситного, бейнитного, нормального) переохлажденного аустенита в зависимости от температуры нагрева и последующего охлаждения с заданной скоростью. Исследована микроструктура марки стали 12Х3Г2МФС для всех рассмотренных режимов при увеличении от 100 до 1000 крат. Построены термокинетические диаграммы марки стали 12Х3Г2МФС в интервале исследуемых значений температуры превращения переохлажденного аустенита от 920 до 800 °С и в диапазоне скоростей охлаждения от 100 до 0,05 °С/с, с определением микротвердости для каждого режима нагрева и охлаждения. Экспериментально установлены зависимости механических свойств (предела прочности, условного предела текучести, относительного удлинения, относительного сужения, ударной вязкости) и твердости исследуемой системно-легированной безникелевой низкоуглеродистой марки стали 12Х3Г2МФС от фактических режимов термической обработки, позволяющие управлять уровнем прочностных и пластических характеристик, а также ударной вязкостью в зависимости от назначения изделий и условий их работы. Установлены зависимости роста зерна аустенита от температуры нагрева для исследуемой марки стали 12Х3Г2МФС по сравнению с марками сталей 10Х3Г3МФ и 10Х3Г3МФС. Ключевые слова: системно-легированные стали, безникелевые стали, конструкционные стали, низкоуглеродистые мартенситные стали, термокинетические диаграммы, межкритический интервал температур, механические свойства, дилатометрические исследования, критические точки, микроструктура, бейнитно-мартенситная смесь.

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Impact of Metastable Austenite on the Wear Resistance of Tool Steel

Cited by 7 publications

References 1 publication

Microstructure and Properties of Heat Affected Zone in High-Carbon Steel after Welding with Fast Cooling in Water

Microstructure and Properties of Heat Affected Zone in High-Carbon Steel after Welding with Fast Cooling in Water

Evaluation of the Microstructure, Tribological Characteristics, and Crack Behavior of a Chromium Carbide Coating Fabricated on Gray Cast Iron by Pulsed-Plasma Deposition

The Study of Transformations, Structure and Properties of Steel 12kh3g2мfs After Quenching From Inter-Critical Temperature Interval

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