發(fā)布時(shí)間：2018-06-22 16:31

  本文選題：TWIP鋼 + 異步熱軋��； 參考：《安徽工業(yè)大學(xué)》2017年碩士論文

【摘要】：TWIP(Twinning Induced Plasticity)鋼又稱孿晶誘發(fā)塑性鋼,它的組織性能與其軋制后退火過程產(chǎn)生的細(xì)小孿晶組織密切相關(guān),與同步熱軋相比較異步熱軋退火板帶在變形區(qū)更易于軋制變形滲透,可獲得更加細(xì)小的孿晶組織,以及更高的γ織構(gòu)組分,這是由異步軋制在變形區(qū)內(nèi)可獲得更大的等效應(yīng)變和剪切形變引起的。但是,異步熱軋過程變形區(qū)垂直斷面厚度方向存在微觀組織梯度(即變形區(qū)上下表面比心部晶粒更加細(xì)小),工藝對變形區(qū)厚度方向應(yīng)變場的影響,及其在厚度方向應(yīng)變場的差異性還缺乏系統(tǒng)深入的研究。本文采用剛塑性有限元法對TWIP鋼異步熱軋過程進(jìn)行數(shù)值仿真,分析異速比、初始溫度、壓下率、工作輥輥徑、摩擦系數(shù)等工藝參數(shù)對板帶心部形變和厚度方向應(yīng)變場差異性的影響,構(gòu)建相關(guān)數(shù)學(xué)模型。具體研究內(nèi)容如下:(1)通過熱物性參數(shù)實(shí)驗(yàn)和圓柱體單軸壓縮實(shí)驗(yàn),測定材料的熱物性參數(shù)和真實(shí)應(yīng)力-應(yīng)變曲線,采用MATLAB軟件回歸材料的變形抗力模型。(2)采用二維剛塑性有限元法建立用于異步熱軋過程變形區(qū)應(yīng)變場分析的數(shù)值仿真分析模型,通過心部剪切形變隨單元數(shù)量變化的規(guī)律性研究來確定最佳的網(wǎng)格劃分方式,通過最大軋制力計(jì)算值與實(shí)測值的比較來驗(yàn)證有限元模型的有效性。(3)基于數(shù)值仿真結(jié)果,研究不同工藝參數(shù)對板帶心部應(yīng)變(剪切應(yīng)變ε12、壓應(yīng)變ε22、等效應(yīng)變εe)和板帶垂直斷面厚度方向應(yīng)變差異性的影響,并構(gòu)建相關(guān)數(shù)學(xué)模型。
[Abstract]:TWIP (Twinning induced plasticity) steel is also known as twin-induced plastic steel. Its microstructure and properties are closely related to the fine twinning microstructure produced by the annealing process after rolling. Smaller twin structures and higher 緯 -texture components can be obtained due to the larger equivalent strain and shear deformation obtained by asynchronous rolling in the deformation region. However, the microstructure gradient exists in the vertical section thickness direction of the deformation zone during asynchronous hot rolling (that is, the upper and lower surface of the deformation zone is smaller than the grain in the center), and the effect of the process on the strain field in the thickness direction of the deformation zone is obtained. The difference of strain field in thickness direction is still lack of systematic and deep research. In this paper, rigid plastic finite element method is used to simulate the asynchronous hot rolling process of TWIP steel. The ratio of different speed, the initial temperature, the reduction rate and the diameter of work roll are analyzed. The influence of the friction coefficient and other technological parameters on the deformation and thickness direction strain field difference of the plate and strip is studied, and the related mathematical model is established. The specific research contents are as follows: (1) the thermal physical parameters and the true stress-strain curves of the materials are measured by the experiments of thermal physical parameters and uniaxial compression of cylinders. MATLAB software is used to regress the deformation resistance model of materials. (2) Two-dimensional rigid-plastic finite element method is used to establish a numerical simulation analysis model for strain field analysis in the deformation zone of asynchronous hot rolling. The best meshing method is determined by studying the regularity of shear deformation of the core with the number of elements. The validity of the finite element model is verified by comparing the maximum rolling force calculation value with the measured value. (3) based on the numerical simulation results, the finite element model is validated. The effects of different process parameters on the strain difference in the central part of plate and strip (shear strain 蔚 12, compressive strain 蔚 22, equivalent strain 蔚 e) and vertical section thickness of plate and strip were studied, and the related mathematical models were established.
【學(xué)位授予單位】：安徽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG335.11

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