![]() The final microstructure and resulting mechanical properties are tailored by controlling austenite decomposition with suitable combinations of cooling paths and coiling or cooling stop temperatures. 1, 2, 3, 4) The thermo-mechanically controlled process produces fine grained ferritic and/or bainitic steels with improved properties by employing accelerated cooling on the run-out table of a hot mill. Different flow regimes based on the stability of the boundary layer have been discussed with numerical results.The demand for high-quality steel with high strength, good weldability, durability and versatility of applications has seen a surge in the production of hot rolled thermo-mechanically controlled processed (TMCP) steel strip(s) and plate(s) in the past few decades. ![]() A numerical verification of the time for the onset of instability is also presented in this study. An appropriate identification of the time when the instability may set in is discussed. Proper scales have been established to quantify the flow properties in each of these flow regimes. ![]() The flow adjacent to the plate can be classified broadly into a conductive, a stable convective, or an unstable convective regime determined by the Rayleigh number. The scaling relations have been developed by equating important terms of the governing equations based on the development of the boundary layer with time. A scaling relation for the onset of instability of the boundary layer is achieved. It is found that the cold boundary layer adjacent to the plate is potentially unstable to Rayleigh–Bénard instability if the Rayleigh number exceeds a certain critical value. The natural convection boundary layer adjacent to an inclined plate subject to sudden cooling boundary condition has been studied. ![]()
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