Improved Steels Through Hot Strip Mill Controlled Cooling

Morgan, Eric R.; Dancy, T. E.; Korchynsky, M.

doi:10.1007/bf03398938

Cited by 9 publications

(6 citation statements)

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“…Initial problems with toughness were overcome by the development of controlled rolling to refine the prior austenite grain size and effect transformation to fine grained ferrite. 31,32 Curiosity about the mechanism of precipitation and how it can be optimised to improve strength and toughness of low carbon structural steels drove much of Honeycombe's research, initially at Sheffield and then at Cambridge, following his appointment as Goldsmith Professor of Metallurgy in 1966.…”

Section: Interphase Precipitation In Commercial Steelsmentioning

confidence: 99%

Review: Interaction of precipitation with recrystallisation and phase transformation in low alloy steels

Dunne¹

2010

Materials Science and Technology

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The processes of precipitation, restoration and phase transformation can interact in complex ways during thermomechanical processing of microalloyed steels to profoundly alter their structures and properties. Precipitation in austenite during hot deformation can strongly modify the kinetics of recovery and recrystallisation, subsequently affecting the nucleation and growth of ferrite during cooling. For steels containing strong carbide/nitride formers, interphase precipitation (IP) can occur in ferrite at the austenite/ferrite interface, conferring significant coherency strengthening. Much of what is known about this phenomenon is attributable to the impressive research efforts of Robert Honeycombe and his colleagues at Cambridge.

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Section: Interphase Precipitation In Commercial Steelsmentioning

confidence: 99%

Review: Interaction of precipitation with recrystallisation and phase transformation in low alloy steels

Dunne¹

2010

Materials Science and Technology

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“…As coolant temperature increases, vapor film wavelength decreases due to decreased surface tension, reducing film boiling effect. 60,61 The vapor film wavelength has been determined using Equation (6) shown in Table 4, corresponding to coolant thermophysical properties from Table 5.…”

Section: Vapor Film Wavelength Determinationmentioning

confidence: 99%

Experimental investigation of hot AISI 304 steel plate with very‐high mass‐flux varying water temperature spray

Kumar

Chakraborty

2021

Heat Trans

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The spray cooling is investigated for very high massflux coolants at different temperatures. First, the intended spray is characterized for its role in the cooling enhancement, which reveals that droplet detachment frequency, droplet residence time, liquid film, and vapor film wavelength influence heat-transfer performance for high-temperature very-high mass-flux spray. After that, the furnace heated 6-mm thick steel plate at 1030°C is quenched using spray possessing average impingement density (231 kg/m 2 s) and coolant temperatures (30°C, 40°C, and 50°C). The heat transfer performance is analyzed using inverse heat conduction analysis, wherein temperature-dependent steel thermophysical properties are considered. The heat transfer performance assessment through parameters such as cooling rate, surface heat flux, and heat transfer coefficient curves shows improvement in cooling performance. For 50°C coolant temperature, we observed the maximum improvement in cooling rate, 141°C/s, and critical heat flux, 3.64 MW/m 2 . The efficiency analysis reveals that coolant at the highest temperature is the most efficient. Also, an approximate cost assessment suggests enhanced coolant temperature as an

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“…volume is proportional to d; 1 For homogeneous nucleation, ferrite grain size is independent of austenite grain size. In an actual ferrite transformation, several types of nucleation site act simultaneously, and the dependence of ferrite grain size on austenite grain size is a weighted average of the various nucleation modes.…”

Section: Ferrite Grain Size Dependence On Austenite Grain Sizementioning

confidence: 99%

Effect of cooling rate on grain size of ferrite in a carbon steel

Umemoto¹,

Guo²,

Tamura³

1987

Materials Science and Technology

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Ferrite grain refinement by accelerated cooling has been studied in a carbon steel. The size of ferrite grains da formed by continuous cooling transformation from polygonal austenite has been measured as a function of cooling rate and austenite grain size dy• In the cooling rate range studied (q = 0·05-5 K S-1), d a was found to be proportional to q-0 0 2 cf/ 6 . The mechanism of grain refinement by accelerated cooling is discussed, and it is shown that this occurs in the transformation where the ratio of nucleation to growth rate increases with a decrease in temperature. The austenite grain size dependence of ferrite grain size is shown to become progressively large as the nucleation mode changes from homogeneous to grain surface to edge to corner. A theoretical estimation of ferrite grain size formed by continuous cooling transformation was attempted on the basis of nucleation and growth rates. In the alloy studied, ferrite grain size .T'h· . I was theoretically estimated to be proportlOna to q ay • .1, is was In c ose agreement with the dependence obtained in the present experiment.MSTj466

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Improved Steels Through Hot Strip Mill Controlled Cooling

Cited by 9 publications

References 0 publications

Review: Interaction of precipitation with recrystallisation and phase transformation in low alloy steels

Review: Interaction of precipitation with recrystallisation and phase transformation in low alloy steels

Experimental investigation of hot AISI 304 steel plate with very‐high mass‐flux varying water temperature spray

Effect of cooling rate on grain size of ferrite in a carbon steel

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