Improved method for severe thermal shocks testing of ceramics by water quenching

Absi, Joseph; Glandus, J.C.

doi:10.1016/j.jeurceramsoc.2003.09.024

Cited by 36 publications

(20 citation statements)

References 9 publications

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“…The ratio (f amax -f mmax )/f mmax increases from 22.4% at 200°C to 437.9% at 500°C, and the change is substantially greater than that in the magnitude of σ max . Thus, when the time factor is important, such as short-time thermal shock [23], it is not a good strategy to use h a instead of h m .…”

Section: Resultsmentioning

confidence: 99%

Effect of temperature-dependent surface heat transfer coefficient on the maximum surface stress in ceramics during quenching

Shao

Song

Jiang

et al. 2016

Philosophical Magazine

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Section: Resultsmentioning

confidence: 99%

Effect of temperature-dependent surface heat transfer coefficient on the maximum surface stress in ceramics during quenching

Shao

Song

Jiang

et al. 2016

Philosophical Magazine

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“…[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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“…5,9 In existing studies, the HTC for ceramics in thermal shock was usually determined by measuring the critical temperature differences according to the theory of critical fracture stress. 4,8,11 Strictly speaking, the HTC obtained by this method only stands roughly for the effective values of the HTC during thermal shock at the critical temperature differences. 7,8 In addition, based on solving the inverse heat conduction problem, the variation of HTC as function of surface temperature of the tested specimens can be determined by measuring the temperature distribution in the specimens during thermal shock.…”

Section: Introductionmentioning

confidence: 99%

“…1,2 However, the thermal shock failure mechanisms have not been understood very well up to now. [3][4][5][6] One of the most difficult problems is to determine the surface heat transfer coefficient (HTC) between the ceramics and the heat transfer media in the course of thermal shock, which plays a key role in deciding the thermal stresses generated in the materials. 7,8 The HTC between a material and a medium is traditionally considered to be a constant in the theories of heat transfer and thermal stresses.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the surface heat transfer coefficient for Al2O3 ceramic in water quench

Zhou

Song

Shao

et al. 2012

Journal of the European Ceramic Society

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In this paper, we determined the surface heat transfer coefficient of Al 2 O 3 ceramics quenched from different initial temperatures into a water bath at room temperature. By using the multipoint temperature measurement technique and the inverse heat conduction method, this coefficient was measured as function of surface temperature of the ceramics during the water quench. The obtained results indicate that the surface heat transfer coefficient largely depends not only on the initial quenching temperature and their evolution in quenching media but also on the sizes of tested specimens. In addition, brief discussion was completed on the rationality of the traditionally used approach, which considers the surface heat transfer coefficient as a joint constant of materials and quenching media, in previous studies on heat transfer and thermal stresses.

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Improved method for severe thermal shocks testing of ceramics by water quenching

Cited by 36 publications

References 9 publications

Effect of temperature-dependent surface heat transfer coefficient on the maximum surface stress in ceramics during quenching

Effect of temperature-dependent surface heat transfer coefficient on the maximum surface stress in ceramics during quenching

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

Characteristics of the surface heat transfer coefficient for Al2O3 ceramic in water quench

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