Analysis of thermal stresses in massive steel ingots in the process of their heating in a furnace prior to their treatment by pressure

Samoilovich, Yu. A.; Тимошпольский, В. И.; Trusova, I. A.; Kabishov, S. M.

doi:10.1007/s10891-008-0005-8

Cited by 2 publications

(4 citation statements)

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“…17 Research points to large residual stresses that can form in the longitudinal direction during the casting and cooling process. 7 In summary, thermal mismatch can cause large longitudinal stresses through the length of an as-cast slab. These stresses can then propagate cracks in a brittle manner through the thickness of the slab called clinking.…”

Section: Discussionmentioning

confidence: 99%

“…17 Research points to large residual stresses that can form in the longitudinal direction during the casting and cooling process. 7…”

Section: Discussionmentioning

confidence: 99%

“…The J-integral can be broken down into an elastic and plastic component, J el and J pl , respectively, see equation (6). The elastic component can be calculated from the stress intensity factor at failure K, see equation (7). J pl is calculated through equation (8), where A p is the plastic area calculated through the trapezium rule as denoted in Figure 11.…”

Section: J-integral Assessmentmentioning

confidence: 99%

“…These stresses result in residual stresses remaining in the slab once the slab has cooled prior to reheating. 6,7 Residual stresses can also increase the level of constraint around the crack, resulting in a brittle fracture which occurs at a lower stress than predicted through simple superposition of residual and reheating stresses. 8 Kumowicz and Al 9 noticed the same phenomenon and ranked steels in an index depending on how susceptible they are to clinking.…”

Section: Introductionmentioning

confidence: 99%

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Toughness measurements of a Cr martensitic high alloy steel susceptible to clinking

Khosla

Balint

Farrugia

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part L:

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'Clinking' is an audible fracture that occurs during the cool down and reheating of as-cast high alloy materials. When this process occurs, audible fracture can be heard and observed as large transverse cracks that propagate through large slabs. This causes high material losses and major disruption to processing operations. Given the fracture is known to be brittle, this research is aimed at developing a way to predict the onset of clinking through the application of fracture mechanics. Linear elastic and elastic-plastic fracture mechanics were both used to assess the fracture behaviour. The stress state during cool down and reheating was estimated through finite element analysis using a 3D finite element model. Tensile tests were conducted to obtain the stress-strain characteristics to be used in the fracture analysis. Charpy tests were completed to assess the relative toughness dependent on temperature across the temperature range for which the high alloy steel is susceptible to clinking. Four C(T) specimens were tested at room temperature. Despite showing little ductile crack propagation on the fracture surface, the fractured samples did not meet the LEFM validity criterion, but did meet the J c validity criterion. This allows a minimum J c value of 118 N/mm to be attributed to the onset of unstable fracture. Converted into a K Jc gives 164 MP√m which gives a minimum critical crack length of 138mm for the onset of brittle fracture. Charpy tests showed a pronounced increase in the energy for fracture between 20°C and 300°C which is line with practical observations whereby the onset of clinking is reduced with a higher reheat temperature.

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Section: Discussionmentioning

confidence: 99%

“…17 Research points to large residual stresses that can form in the longitudinal direction during the casting and cooling process. 7…”

Section: Discussionmentioning

confidence: 99%