Effect of retained austenite on wear resistance of nanostructured dual phase steels

Hu, Feng; Wu, Kaiming; Hodgson, Peter

doi:10.1179/1743284715y.0000000061

Cited by 36 publications

(18 citation statements)

References 33 publications

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“…The bainite and retained austenite were further refined. As part of the friction energy was absorbed for the transformation of retained austenite and refinement of the microstructure, less energy was available for nucleation and propagation of subsurface cracks [ 39 ]. The wear process had no significant effect on the microstructure of the substrate, which indicated that both hardness and microstructure contribute to improving the tribological properties of the laser forming repaired samples.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Tribological Properties of Laser Forming Repaired 34CrNiMo6 Steel

et al. 2018

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Laser forming repair (LFR) technology has considerable potential in high strength steel structure repair. 34CrNiMo6 steel has been widely used in high-value components, and it is imperative to repair these damaged components. In this study, two different thicknesses of repaired layers are deposited on the 34CrNiMo6 wrought substrate with five layers and 20 layers via LFR technology. The microstructure, phases, microhardness, and tribological properties are analyzed using optical microscopy, scanning electron microscopy, X-ray diffraction, Vickers hardness testing, and dry sliding wear testing. These results show that the 34CrNiMo6 repaired layers were successfully deposited on the substrate. The microstructure of the laser-repaired layers in the five-layer sample included bainite and retained austenite. For the 20-layer sample, the microstructure in the top of the repaired layers was still bainite and retained austenite, whereas that in the bottom of the repaired layers was transformed into ferrite and cementite. The average coefficients of friction of repaired layers is not significantly different from the substrate. The wear rate of the five LFR layers, 20-layer LFR, and substrate samples were 12.89 × 10−6, 15 × 10−6, and 23.87 × 10−6 mm3/N·m, respectively. The laser forming repaired samples had better wear resistance compared to the substrate. The wear mechanism of laser forming repaired samples is abrasive wear; whereas that of the substrate is abrasive wear and fatigue wear.

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Section: Resultsmentioning

confidence: 99%

Microstructure and Tribological Properties of Laser Forming Repaired 34CrNiMo6 Steel

et al. 2018

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“…Optimisation of production process for nanostructured bainitic steel products for various applications -including armour components, especially in the scope of chemical composition and final heat treatment parameters, is still the subject of research in many scientific centres (e.g. [1][2][3][4][5][6][7]). Understanding the material properties determined in static and dynamic laboratory tests that determine resistance to high-energy impact (e.g.…”

Section: Przedmiotem Artykułu Jest Ustalanie Korelacji Pomiędzy Właścmentioning

confidence: 99%

Correlation of Mechanical Properties and Resistance to Perforation of Armour Elements Made of Nanostructured Bainitic Steel

Marcisz

Garbarz

Walnik

2019

JMM

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The aim of the paper is to determine the correlation between mechanical properties determined in quasi-static tensile tests and dynamic compression tests, and resistance to perforation and cracking in firing tests of nanostructured bainitic steel sheets. The relationship between mechanical characteristics and ballistic resistance makes it possible to specify and optimise the production parameters of steel elements for armour and shields providing ballistic protection. As a result of the tests, the level of mechanical parameters and the type of microstructure, as well as the minimum thickness of the nanostructured bainitic steel sheet, ensuring compliance with the requirements of level 2 ballistic protection according to Stanag 4569, were determined.

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“…Without regard to the welding limit, continuously cooled carbide-free bainitic steel is a kind of potential candidate for railway applications owing to its higher fracture toughness and fatigue resistance [ 2 , 3 , 4 ]. In addition, it has been reported that the thickness of bainitic lath can achieve to the nanometer level by the isothermal heat treatment [ 4 , 5 , 6 ]. These bainitic steels perform better mechanical properties than continuous cooling bainitic steels.…”

Section: Introductionmentioning

confidence: 99%

“…Liu et al [ 30 ] considered that bainitic steels had excellent properties by blunting the crack tip on account of the presence of RA. While, some researchers believed that the wear resistance of bainitic steels was determined by the content of RA [ 5 , 30 ], other studies suggested that the stability of RA indeed played a significant role on promoting the damage resistance [ 2 ] and wear resistance [ 6 , 27 , 28 ] due to the TRIP effect. However, it is still elusive how the contact stress and slip ratio affect the transformation of RA in the bainitic steels.…”

Section: Introductionmentioning

confidence: 99%

Dry Rolling/Sliding Wear of Bainitic Rail Steels under Different Contact Stresses and Slip Ratios

Liu

Zhang

et al. 2020

Materials

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This study aims to deeply understand the effect of contact stress and slip ratio on wear performances of bainitic rail steels. The results showed that the wear loss increased as the contact stress and slip ratio increased. Based on the surface damage morphology and microstructural analyses, it revealed that the rolling contact fatigue wear mechanism played a significant role under the low slip ratio, but the dominant wear mechanism transferred to the abrasive wear at the high slip ratio. Meanwhile, the bainitic steel specifically presented worse wear resistance under the abrasive wear mode. Compared with the influence of a slip ratio, the increase in contact stress led to severer plastic flows and contributed to the propagation of cracks. In addition, the contact stress and slip ratio had the opposite effect on the friction coefficient, that is, the friction coefficient of bainitic steels behaved the inverse proportion with the contact stress, but positive proportion with the slip ratio. At last, the increase in slip ratio had more significant effect on the reduction of retained austenite (RA) than the enlargement of contact stress due to the fact that the RA would probably be removed before the martensitic transformation occurred under the abrasive wear mechanism.

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Effect of retained austenite on wear resistance of nanostructured dual phase steels

Cited by 36 publications

References 33 publications

Microstructure and Tribological Properties of Laser Forming Repaired 34CrNiMo6 Steel

Microstructure and Tribological Properties of Laser Forming Repaired 34CrNiMo6 Steel

Correlation of Mechanical Properties and Resistance to Perforation of Armour Elements Made of Nanostructured Bainitic Steel

Dry Rolling/Sliding Wear of Bainitic Rail Steels under Different Contact Stresses and Slip Ratios

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