For hot rolling, a comprehensive constitutive model is developed for high-temperature behaviors of non-oriented electrical steels. Based on the analysis of CCT curves of non-oriented electrical steels from the industrial hot rolling mills, by using the Gleeble thermal stress-stain simulator, the current study is focused on the temperature range from 750 to 1 120 ℃and the strain rate range from 0.05 to 10 per second. As temperature is lowered, in the austenite region (1 120-975 ℃), the stress increases; in the austenite-ferrite region (975-875 ℃), the stress decreases; and in the ferrite region (875-750 ℃), the stress increases. In the ferrite region, dynamic recovery softening mechanism is most pronounced; in the austenite region, dynamic recrystallization tends to be the dominant process. If the deformation rate rises, dynamic recrystallization would be suppressed, and dynamic recovery would be promoted. In the framework of modified Arrhenius model, a constitutive relation is established describing the work hardening and softening mechanisms in the entire rolling procedure, which can predict quite precisely the properties of the processed materials.
CAO Jianguo, WANG Tiancong, LI Hongbo, QIAO Yu, WEN Dun, ZHOU Yunsong
. High-temperature Constitutive Relationship of Non-oriented Electrical Steel Based on Modified Arrhenius Model[J]. Journal of Mechanical Engineering, 2016
, 52(4)
: 90
-96
.
DOI: 10.3901/JME.2016.04.090
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