Correlation of microstructure and thermal-fatigue properties of centrifugally cast high-speed steel rolls

Kim, Chang Kyu; Park, Jong Il; Ryu, Jee-Hwan; Lee, Sunghak

doi:10.1007/s11661-004-0359-2

Cited by 20 publications

(12 citation statements)

References 19 publications

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“…The size of the cell structure plays a role in distributing carbides. [11,18] Thus, these microstructural factors should be controlled in optimal combinations to manufacture the HSS rolls. To improve the wear resistance, in particular, the most important factor is the formation of a number of discontinuous carbides homogeneously distributed inside cells or along cell boundaries.…”

Section: Discussionmentioning

confidence: 99%

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Effects of Alloying Elements on Microstructure, Hardness, Wear Resistance, and Surface Roughness of Centrifugally Cast High-Speed Steel Rolls

Sung

Park

et al. 2009

Metall Mater Trans A

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A study was made of the effects of carbon, tungsten, molybdenum, and vanadium on the wear resistance and surface roughness of five high-speed steel (HSS) rolls manufactured by the centrifugal casting method. High-temperature wear tests were conducted on these rolls to experimentally simulate the wear process during hot rolling. The HSS rolls contained a large amount (up to 25 vol pct) of carbides, such as MC, M 2 C, and M 7 C 3 carbides formed in the tempered martensite matrix. The matrix consisted mainly of tempered lath martensite when the carbon content in the matrix was small, and contained a considerable amount of tempered plate martensite when the carbon content increased. The high-temperature wear test results indicated that the wear resistance and surface roughness of the rolls were enhanced when the amount of hard MC carbides formed inside solidification cells increased and their distribution was homogeneous. The best wear resistance and surface roughness were obtained from a roll in which a large amount of MC carbides were homogeneously distributed in the tempered lath martensite matrix. The appropriate contents of the carbon equivalent, tungsten equivalent, and vanadium were 2.0 to 2.3, 9 to 10, and 5 to 6 pct, respectively.

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Section: Discussionmentioning

confidence: 99%

“…[9][10][11] It also involves microscopic and dynamic processes occurring in the interface between the roll and the rolled material, and is almost impossible to observe directly. Because the roll surface is repeatedly under mechanical and thermal stresses during hot rolling, the surface layer is often damaged.…”

Section: Introductionmentioning

confidence: 99%

Effects of Alloying Elements on Microstructure, Hardness, Wear Resistance, and Surface Roughness of Centrifugally Cast High-Speed Steel Rolls

Sung

Park

et al. 2009

Metall Mater Trans A

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“…Generally,this type of crack can form only when the carbide boundary is approximately perpendicular to the scratch direction.. An interesting finding from the observation on the fracture pattern of eutectic M 2 C, the eutectic MC is that the eutectic MC can be more effective to prevent crack propagation. This offers an improved informed understanding on the influence of morphology and distribution of eutectic carbides on thewear resistance as well as hardness [26][27][28]. Since eutectic MC offers better fracture and wear resistance than eutectic M 2 C, how to minimize or control the eutectic M 2 C would be of great industrial significance.…”

Section: Effect Of the Eutectic Carbide Typementioning

confidence: 99%

Investigation of microstructural damage to eutectic carbides from scratch tests of a heat-treated Fe–Cr–W–Mo–V–C alloy

Guo

Feng

Liu

et al. 2016

Wear

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Abstract:The characteristics of abrasive wear damage to the carbides and eutectic phases in a Fe-Cr-W-Mo-V-C alloy were systematically investigated using point scratch testing on heat-treated samples with preserved eutectic structures from a characteristic eutectic carbide formation temperature of 1240°C. A deep-etching method is applied to study the detailed morphologies of the eutectic carbides by optical microscopy (OM) and field emission scanning electron microscopy (FESEM). The types of the eutectic carbides was identified by X-ray diffraction (XRD) as V-rich eutectic MC and Mo-rich eutectic M 2 C. Single-pass scratch tests were carried out on polished and deep-etched surfaces of the specimens to investigate the micro-scale wear behavior of the eutectic carbides with and without protection by the matrix phase. It was found that, when a surrounding matrix is present, the micro-cracks initiate from the eutectic region during the scratch tests and slip-lines appear in scratched edges of the matrix phase. Without matrix protection as revealed in the deep etched samples, the main failure form is carbide dendrites break-off forming wear debris. The detailed differences in response and deformation mode of carbide microstructures with/without matrix support to single-point abrasion behavior are schematically depicted for main eutectic MC and M 2 C carbides under different loading conditions. Potential 2 improvement on wear performance through the composition design is also discussed based on the different fracture and wear behavior of V-rich eutectic MC and Mo-rich eutectic M 2 C identified

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“…In hot-working rolls the thermal stresses are usually comparable or even larger than the mechanical stresses. [3][4][5][6][7][8][9][10] To increase the die's service time it is important and also the common task for both die designers as well as for producers of die steels, to shift the occurrence of cracks to later times and to decrease their growth rate. Hot working rolls are usually alloyed with Cr, V, Mo, W, and after solidification process they are heat treated accordingly.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] Several research works related to thermal fatigue resistance of die materials (i.e. steels, cast irons) were carried out where reasons for initiation and growth of cracks at hot working dies (forging, die casting) [17][18][19][20][21][22][23][24][25][26][27][28][29][30] and hot working rolls [3][4][5][6]9,[31][32][33][34] were investigated using various laboratory tests. However, detailed knowledge about the influence of the stress state, the temperature and the oxidation on the initiation and propagation of thermal cracks in hot working applications is still lacking.…”

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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Correlation of microstructure and thermal-fatigue properties of centrifugally cast high-speed steel rolls

Cited by 20 publications

References 19 publications

Effects of Alloying Elements on Microstructure, Hardness, Wear Resistance, and Surface Roughness of Centrifugally Cast High-Speed Steel Rolls

Effects of Alloying Elements on Microstructure, Hardness, Wear Resistance, and Surface Roughness of Centrifugally Cast High-Speed Steel Rolls

Investigation of microstructural damage to eutectic carbides from scratch tests of a heat-treated Fe–Cr–W–Mo–V–C alloy

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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