Dynamic transformation during the simulation of strip rolling
Simulations of hot strip rolling were carried out on the McGill torsion machine at strain rates of 2 and 4 s -1 and cooling rates of 5 - 10℃/s.A 0.09%C-O.036% Nb microalloyed and a 0.79C-0.65 Mn - 0.24Si plain C steel were subjected to pass strains of 0.25 to 0.45 and interpass times of 1 second.By means of double differentiation of the flow curves,it is shown that the dynamic transformation ( DT) of austenite to ferrite takes place during all the passes applied above the respective Ae3 equilibrium transformation temperatures ( 836℃ and 733℃ for the two steels).This type of transformation is initiated at strains of about 0.05,well before the critical strain for the initiation of dynamic recrystallization,and occurs at temperatures as much as 200℃ above the Ae3.The transformation to ferrite reduces the rolling load below the levels expected for single phase austenite and can lead to shape control problems if not taken into account.The DT ferrite formed in this way is Widmanstatten in nature and is converted to polygonal ferrite during further straining.
strip mill simulations rolling load mean flow stress dynamic transformation interpass time
John J Jonas Vladimir V Basabe Chiradeep Ghosh Clodualdo Aranas Jr
Materials Engineering,McGill University,3610 University St.,Montreal,H3A 282,Canada
国内会议
上海
英文
1-6
2013-06-01（万方平台首次上网日期，不代表论文的发表时间）