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Research on the Thermal Deformation of Non-Oriented Silicon Steel W20 and W30 in High Temperature

Author: CaoLiMei
Tutor: LiChangSheng
School: Northeastern University
Course: Materials Processing Engineering
Keywords: non-oriented silicon steel thermal deformation deformation resistance phase transition
CLC: TG335
Type: Master's thesis
Year: 2009
Downloads: 112
Quote: 0
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Abstract


During the rough rolled of the medium-grade and low-grade non-oriented silicon steel with low silicon, the defects like as warping, scaffolding and edge scab may make a strong impact on the production efficiency and the quality of the products. This paper bases on the research project named "Temperature Model Research and Application of Non-Oriented Silicon Steel in Rough Rolled of Two-phase Region ".This project is studied by the State Key Laboratory of Rolling and Automation of Northeaster University and WISCO. The paper research the thermal deformation of non-oriented silicon steel W20 and W30 in high temperature. The main results are as follows:1. Base on thermal expansion carried out by MMS-200 thermal-mechanical simulator, the curves of CCT have been drew. When the cooling rate is increased from 1℃/s to 30℃/s, the beginning temperature of the phase transition of W20 is from 1022℃to 965℃and the finished temperature is from 983℃to 918℃; he beginning temperature of the phase transition of W20 is from 928℃to 862℃and the finished temperature is from 873℃to 798℃.The temperature range of the phase transition is small, from 40℃to 60℃. We analyzed the influence of cooling rate, strain rate, deformation degree on phase transition.2. Base on single pass reduction experiment carried out by MMS-200 thermal-mechanical simulator, the curves of stress-strain have been drew and We also analyzed the influence of the effect of deformation temperature、strain rate and strain on deformation resistance. The microstructure is researched by optical and scanning electrical microscope and we analyzed the influence of different deformation condition on grain size.3. Base on the curves of stress-strain carried out by MMS-200 thermal-mechanical simulator and the basis of regression calculate, the deformation resistance model of non-oriented silicon steel in different phase field have been established, therefore it offer the theory basis and reference to setting calculate before hot-rolling. 4. We analyze the law of thermal deformation by fitting curves of the flow stress and temperature. The deformation resistance model is applied in the FEM and warping phenomenon is analyzed by FEM.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal pressure processing > Rolling > Rolling process
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