Damage in hot rolling work rolls

Colás, Rafael; Ramírez, J. Candelas; Sandoval, Ignacio V.; Morales, Julio Carabaña; Leduc, Luis Adolfo

doi:10.1016/s0043-1648(99)00081-2

Cited by 75 publications

(43 citation statements)

References 3 publications

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“…For the case of friction test with oxidised surfaces, the propagation of the cracks in the bulk under shearing stresses may cause the detachment of oxide scales at the pin contact surface [23,24]. The shear strength of oxide scale is defined as the maximal interfacial shear stress [25], where an interfacial fracture will be triggered on the oxide and steel substrate interface.…”

Section: Tribological Properties Of Magnetite Precipitatesmentioning

confidence: 99%

Tribological properties of magnetite precipitate from oxide scale in hot-rolled microalloyed steel

Jiang

Wei

et al. 2013

Wear

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Nano-magnetite (Fe3O4) particles have a potential to lead to the formation of lubrication tribofilm that reduces the friction and wear in hot steel strip rolling. In this paper, an attempt to fabricate the oxide film with magnetite precipitates from thermally-grown wustite (Fe1-xO) layer during isothermal cooling of low carbon microallyed steel, was obtained. The precipitation behaviors were investgated on Gleeble 3500 thermomechanical simulator under the humid air with water vaour content of 19.5 per vol percent. Several types of magnetite precipitates were examined using scanning electron microscope (SEM) with energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) analysis. The tribological properties of magnetite precipitates were investigated in pin-on-disc configuration. It was found that the dispersed magnetite particles originate from either the pro-eutectoid precipitation above 570 degrees celcius or the partical decomposition of wustite below 570 degrees celcius. The oxide film on the presence of free particles durin g eutectoid precipitation could be a lubricant and consequently resist wear, particularly for the oxide scale with a typical thickness in the range of 8 to 11 um in dry ai and moisture atmosphere. Furthermore, characterisation and precipitation process of the oxide scale are discussed, with respect to a probable mechanism to explain the lubricated properties has been proposed. thermo-mechanical simulator under the humid air with water vapour content of 19.5 vol.%. Several types of magnetite precipitates were examined using scanning electron microscope (SEM) with energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) analysis. The tribological properties of magnetite precipitates were investigated in pin-on-disc configuration. It found that the disperse magnetite particles originate from either the pro-eutectoid precipitation above 570C or the partial decomposition of wustite below 570C. The oxide film on the presence of free particles during eutectoid precipitation could be a lubricant and consequently resist wear, particularly for the oxide scale with a typical thickness in the range of 8 to 11μm in dry air and moisture atmosphere. Furthermore, characterisation and precipitation process of the oxide scale are discussed, with respect to a probable mechanism to explain the lubricated properties has been proposed.

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Section: Tribological Properties Of Magnetite Precipitatesmentioning

confidence: 99%

Tribological properties of magnetite precipitate from oxide scale in hot-rolled microalloyed steel

Jiang

Wei

et al. 2013

Wear

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“…1,2) In addition, thermal fatigue due to periodic heating and cooling of a roll surface, oxidation wear, fatigue wear, and sticking of a rolled material into a roll surface also affect the roll wear. [3][4][5][6][7] Such a tribology in hot rolling is a microscopic and dynamic phenomenon occurring in the interface between the roll and rolled material, wherein dynamic, thermal, chemical, and metallic factors are working.…”

Section: Introductionmentioning

confidence: 99%

Effects of Tempering Temperature on Wear Resistance and Surface Roughness of a High Speed Steel Roll.

Lee

Park

et al. 2001

ISIJ International

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The effects of tempering temperature on wear resistance and surface roughness of a high speed steel (HSS) roll manufactured by centrifugal casting method were investigated in this study. Hot-rolling simulation test was carried out using a high-temperature wear tester capable of controlling speed, load, and temperature. The test results revealed that the peak-tempered roll specimen showed the best wear resistance because of its hard matrix. However, its surface roughness deteriorated as the scratching wear proceeded, thereby leading to increase in friction coefficient. In the over-tempered specimens containing numerous fine spherical carbides in the matrix, the abrasive wear occurred predominantly as fine carbides were fallen off from the matrix, and thus the surface roughness was enhanced by the homogeneous wear of both matrix and carbides. These findings suggested that the tempering treatment at temperatures slightly past the peak hardness point would be more desirable in order to improve the wear resistance with consideration of the surface roughness of the HSS roll.

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“…The occurrence of different damage, i.e., cracks, fracture, plastic deformation and wear, are a consequence of the different magnitudes of the mentioned loads as well as their different mutual ratios, materials properties, etc. [1][2][3][4][5][6][7] Thus, in the case of cyclical subjection to high temperatures, i.e., the heating of rolls (also above 600°C) and their water cooling, these conditions lead to the occurrence of cracking on the die's surface, which appears in the shape of a crack network that consequently results in spalling of the die material that further leads to a deterioration of the surface finish of the workpiece. In hot-working rolls the thermal stresses are usually comparable or even larger than the mechanical stresses.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the thermal fatigue resistance for 3.1C, 0.8Si, 0.9Mn, 1.7Cr, 4.5Ni and 0.3Mo ICDP cast iron roll at 600 °C

Terčelj¹,

Fajfar²,

Godec³

et al. 2017

Mater. Tehnol.

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Using a new test rig the characteristics related to the thermal fatigue resistance for ICDP (Indefinite Chill Double Pour) cast iron for hot working rolls was investigated. Tests were carried out at 600°C to obtain the characteristics of cracks at (500, 1000 and 1500) cycles. For comparative purposes, additionally a test at 500°C was carried out. The average length of all the cracks, their density, average length of five longest cracks and relevant microstructural characteristics for the mentioned cycles were determined. It was found that the cracks initiation and their growth are related to the cracking and spalling of the carbides, shape of graphite, distribution of carbides and graphite particles, oxidation, etc. The obtained results contribute to a better understanding of the thermal cracking of selected roll cast iron. Based on these results the suggestions for improving the thermal fatigue resistance for the cast iron roll are given. Keywords: roll cast iron, thermal fatigue, cementite, graphite, cracks Novo razvita naprava je bila uporabljena za raziskave lastnosti ICDP litega`eleza, ki so povezane z odpornostjo na termi~no utrujanjem. Zna~ilnosti razpok so bile dolo~ene po (500, 1000 in 1500) ciklih, pri 600°C. Za primerjavo je bilo izvedenih nekaj testiranj tudi pri 500°C. Na osnovi rezultatov testiranj je bilo za vsako {tevilo ciklov dolo~ena povpre~na dol`ina vseh dobljenih razpok, njihova gostota, povpre~na dol`ina petih najdalj{ih razpok, vklju~no z ostalimi relevantnimi mikrostrukturnimi zna~ilnostmi. Rezultati so pokazali, da sta nukleacija in rast razpok tesno povezana s pokanjem in drobljenjem karbidov, z geometrijo grafita, z volumsko porazdelitvijo karbidov ter grafitnih delcev, z oksidacijo, itd. Rezultati prispevajo k bolj{emu razumevanju termi~nega pokanja izbranega materiala za valje. Na osnovi predstavljenih rezultatov so podani predlogi za izbolj{anje odpornosti litega`eleza za valje na termi~no utrujanje.

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Damage in hot rolling work rolls

Cited by 75 publications

References 3 publications

Tribological properties of magnetite precipitate from oxide scale in hot-rolled microalloyed steel

Tribological properties of magnetite precipitate from oxide scale in hot-rolled microalloyed steel

Effects of Tempering Temperature on Wear Resistance and Surface Roughness of a High Speed Steel Roll.

Characteristics of the thermal fatigue resistance for 3.1C, 0.8Si, 0.9Mn, 1.7Cr, 4.5Ni and 0.3Mo ICDP cast iron roll at 600 °C

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