Effects of simulated on line accelerated cooling processing on transformation temperatures and microstructure in microalloyed steels Part 1–Strip processing
作者:
PerelomaE. V.,
BoydJ. D.,
期刊:
Materials Science and Technology
(Taylor Available online 1996)
卷期:
Volume 12,
issue 10
页码: 808-817
ISSN:0267-0836
年代: 1996
DOI:10.1179/mst.1996.12.10.808
出版商: Taylor&Francis
数据来源: Taylor
摘要:
AbstractSimulations 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 T and accelerated cooling interrupt temperature TIon 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.MST/3424
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