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Effects of simulated on line accelerated cooling processing on transformation temperatures and microstructure in microalloyed steels. Part 1 - Strip processing

Journal Article


Abstract


  • Simulations of industrial thermomechanical processing and on line accelerated cooling of a low carbon microalloyed strip steel were carried out using a quench deformation dilatometer. Effects of processing parameters, such as accelerated cooling rate Ṫ and accelerated cooling interrupt temperature TI on the critical transformation temperatures and final microstructure were determined. The most important on line accelerated cooling (OLAC) processing parameter is the accelerated cooling interrupt temperature, which controls whether the transformed microstructure is predominantly ferrite or bainite. A variety of (Ti,Nb,Fe) carbide, nitride, and carbonitride precipitates are present in the OLAC processed samples. The final precipitate distribution is developed at three stages of processing, namely: dissolution and coarsening of pre-existing precipitates at the reheat temperature, precipitation in deformed austenite during the deformation schedule, and precipitation in ferrite after the interruption of accelerated cooling. Maximum precipitation strengthening occurs for TI=700-640°C. © 1996 The Institute of Materials.

Publication Date


  • 1996

Citation


  • Pereloma, E. V., & Boyd, J. D. (1996). Effects of simulated on line accelerated cooling processing on transformation temperatures and microstructure in microalloyed steels. Part 1 - Strip processing. Materials Science and Technology, 12(10), 808-817. doi:10.1179/mst.1996.12.10.808

Scopus Eid


  • 2-s2.0-0004166028

Web Of Science Accession Number


Start Page


  • 808

End Page


  • 817

Volume


  • 12

Issue


  • 10

Abstract


  • Simulations of industrial thermomechanical processing and on line accelerated cooling of a low carbon microalloyed strip steel were carried out using a quench deformation dilatometer. Effects of processing parameters, such as accelerated cooling rate Ṫ and accelerated cooling interrupt temperature TI on the critical transformation temperatures and final microstructure were determined. The most important on line accelerated cooling (OLAC) processing parameter is the accelerated cooling interrupt temperature, which controls whether the transformed microstructure is predominantly ferrite or bainite. A variety of (Ti,Nb,Fe) carbide, nitride, and carbonitride precipitates are present in the OLAC processed samples. The final precipitate distribution is developed at three stages of processing, namely: dissolution and coarsening of pre-existing precipitates at the reheat temperature, precipitation in deformed austenite during the deformation schedule, and precipitation in ferrite after the interruption of accelerated cooling. Maximum precipitation strengthening occurs for TI=700-640°C. © 1996 The Institute of Materials.

Publication Date


  • 1996

Citation


  • Pereloma, E. V., & Boyd, J. D. (1996). Effects of simulated on line accelerated cooling processing on transformation temperatures and microstructure in microalloyed steels. Part 1 - Strip processing. Materials Science and Technology, 12(10), 808-817. doi:10.1179/mst.1996.12.10.808

Scopus Eid


  • 2-s2.0-0004166028

Web Of Science Accession Number


Start Page


  • 808

End Page


  • 817

Volume


  • 12

Issue


  • 10