本文選題：熱軋 + 帶鋼　； 參考：《北京科技大學(xué)》2017年博士論文

【摘要】：熱軋帶鋼生產(chǎn)中時常存在精軋出口檢測到的板形良好,在冷卻后開卷時卻出現(xiàn)浪形和橫彎板形缺陷的情況。這種現(xiàn)象在采用快速冷卻技術(shù)生產(chǎn)的熱軋高強(qiáng)度帶鋼中更為突出,目前對其產(chǎn)生機(jī)理及演變規(guī)律缺乏統(tǒng)一認(rèn)識。這個問題涉及軋后的層流冷卻、鋼卷冷卻以及開卷等工序,既有宏觀形變過程,又有微觀相變過程,較為復(fù)雜。加之無在線檢測儀表獲得帶鋼、鋼卷在冷卻過程中的狀態(tài),大大增加了對此過程研究的難度。本文針對熱軋帶鋼軋后出現(xiàn)的浪形缺陷和橫彎缺陷,從不同工序?qū)彳垘т撥埡髢煞N板形缺陷產(chǎn)生的原因及其演變規(guī)律進(jìn)行研究。本文主要內(nèi)容和研究成果如下:(1)結(jié)合實(shí)際的冷卻設(shè)備參數(shù)和冷卻工藝,通過等溫轉(zhuǎn)變膨脹及動態(tài)CCT等實(shí)驗及ABAQUS有限元軟件的二次開發(fā),精細(xì)考慮帶鋼初始溫度分布、熱物性參數(shù)、熱交換邊界條件及層流冷卻過程中的相變及相變潛熱等因素,建立了具有代表性的700 MPa級高強(qiáng)度熱軋帶鋼層流冷卻過程中溫度、相變、應(yīng)變/應(yīng)力的多場耦合三維有限元模型,得到了快速冷卻條件下帶鋼溫度、相變、應(yīng)力的演變規(guī)律及在帶鋼寬度方向上的分布。(2)以熱軋帶鋼層流冷卻耦合模型為基礎(chǔ),將卷后冷卻過程加入模型,建立熱軋帶鋼軋后冷卻一體化模型,對熱軋帶鋼從精軋溫度冷卻至室溫過程中的溫度、相變、應(yīng)變/應(yīng)力進(jìn)行耦合求解。研究結(jié)果表明,卷后冷卻過程對帶鋼浪形存在較大影響。利用熱軋帶鋼軋后冷卻一體化模型,對比分析了邊部遮擋、稀疏冷卻、微中浪軋制等多種手段對軋后帶鋼板形的改善效果,得到了與工業(yè)試驗一致的最有效的板形優(yōu)化工藝方案。(3)考慮溫度及相變不均的影響,建立快速冷卻條件下熱軋帶鋼上下表面非對稱冷卻的多場耦合有限元模型,得到了層流冷卻過程中帶鋼橫彎的演變規(guī)律,系統(tǒng)分析了不同冷卻工藝及參數(shù)對橫彎的影響,改變了橫彎是由層流冷卻過程中帶鋼上下表面冷卻不均導(dǎo)致的一般認(rèn)識。在此基礎(chǔ)上,建立了熱軋帶鋼開卷過程的彈性力學(xué)解析模型和有限元模型,對帶鋼開卷過程中的力學(xué)變形行為進(jìn)行分析,結(jié)合工業(yè)生產(chǎn)實(shí)測,得到了鋼卷開卷過程中橫彎產(chǎn)生的原因及其主要影響因素。
[Abstract]:In the production of hot rolled strip, the shape detected by finish rolling exit is good, but the wave shape and transverse bending shape defect appear when coiling after cooling. This phenomenon is more prominent in hot rolled high strength strip produced by rapid cooling technology. At present, there is a lack of a unified understanding of its formation mechanism and evolution law. This problem involves laminar cooling, coil cooling and unwinding after rolling, which is complicated by both macroscopic deformation process and micro phase transformation process. In addition, the steel coil is in the state of cooling process without on-line measuring instrument, which greatly increases the difficulty of studying this process. In this paper, the causes and evolution rules of the two kinds of strip defects after hot rolling are studied from different working procedures aiming at the wave shape defects and transverse bending defects after hot strip rolling. The main contents and research results are as follows: (1) considering the actual cooling equipment parameters and cooling process, the initial temperature distribution of strip steel is carefully considered through isothermal transformation expansion and dynamic CCT experiments and the secondary development of Abaqus finite element software. The temperature and phase transition during laminar cooling of 700 MPA grade high strength hot rolled strip steel were established by the parameters of thermal physical properties, boundary conditions of heat exchange, phase transition and latent heat of phase transition during laminar cooling. The multi-field coupled three-dimensional finite element model of strain / stress is used to obtain the strip temperature, phase transformation, stress evolution and width distribution under rapid cooling condition. (2) based on the laminar cooling coupling model of hot rolled strip. The integrated model of post-rolling cooling of hot rolled strip was established by adding the coiling process into the model, and the temperature, phase transformation and strain / stress of hot rolled strip from finishing temperature to room temperature were solved by coupling method. The results show that the cooling process after coiling has a great influence on the wave shape of strip. By using the integrated model of post-rolling cooling of hot rolled strip, the effect of edge occlusion, sparse cooling and micro-medium wave rolling on the improvement of the shape of the strip after rolling is compared and analyzed. The most effective optimization process scheme for strip shape is obtained in accordance with the industrial test. (3) considering the influence of temperature and phase change, a multi-field coupled finite element model for asymmetric surface cooling of hot rolled strip is established under the condition of rapid cooling. The evolution law of transverse bending of strip during laminar cooling is obtained. The influence of different cooling process and parameters on transverse bending is analyzed systematically, and the general understanding that transverse bending is caused by uneven cooling of upper and lower surface of strip during laminar cooling is changed. On this basis, the elastic mechanics analytical model and finite element model of strip uncoiling process are established, and the mechanical deformation behavior of strip uncoiling process is analyzed, combined with the actual measurement in industrial production. The causes and main influencing factors of transverse bending in the unwinding process of steel coils are obtained.
【學(xué)位授予單位】：北京科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：TG335.56

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 陳林;張智剛;金自力;;熱軋微合金高強(qiáng)鋼卷冷卻過程溫度場數(shù)值模擬[J];鋼鐵;2016年10期

2 胡漢江;趙愛民;董瑞;丁然;;72AU2熱軋帶鋼塌卷問題溫度場及應(yīng)力場耦合分析[J];金屬熱處理;2015年09期

3 孫明軍;段爭濤;;超快冷卻技術(shù)及在梅鋼熱軋的應(yīng)用[J];上海金屬;2015年04期

4 蔡麗娟;彭成允;劉其源;李小平;;冷卻通道對超高強(qiáng)度鋼熱成形過程溫度場的影響[J];重慶理工大學(xué)學(xué)報(自然科學(xué));2014年09期

5 張清東;盧興福;張曉峰;;表觀平直帶鋼裁切加工后翹曲變形行為研究[J];工程力學(xué);2014年S1期

6 惠亞軍;趙征志;趙愛民;黃耀;尹恒祥;郭睿;;卷取溫度對鈦微合金化鋼組織與性能的影響[J];材料科學(xué)與工藝;2014年02期

7 張清東;盧興福;戴杰濤;秦劍;;冷軋帶鋼板形翹曲變形過程及規(guī)律的解析[J];北京科技大學(xué)學(xué)報;2014年03期

8 胡燕慧;孔凡慶;滕華湘;李潔;尉冬;商婷;;卷取溫度對低碳鋁鎮(zhèn)靜鋼熱鍍鋅板抗時效性能的影響[J];鋼鐵;2013年11期

9 白振華;李龍華;李銘澤;高明磊;王瑞;李和;;熱軋帶鋼卷取后翹曲計算模型研究[J];燕山大學(xué)學(xué)報;2013年03期

10 譚海林;;熱沖壓模具冷卻系統(tǒng)的設(shè)計及模擬分析[J];模具制造;2012年11期

相關(guān)博士學(xué)位論文 前5條

1 董瑞;中錳鋼組織演變規(guī)律與相變誘導(dǎo)塑性行為[D];北京科技大學(xué);2015年

2 張磊;高強(qiáng)度鋼板熱沖壓過程的模具溫度控制與數(shù)值模擬技術(shù)研究[D];山東大學(xué);2013年

3 賀連芳;硼鋼B1500HS的熱沖壓關(guān)鍵參數(shù)測試及其淬火性能研究[D];山東大學(xué);2012年

4 徐海倫;連鑄異形坯冷卻過程模擬仿真及優(yōu)化[D];重慶大學(xué);2010年

5 賀慶強(qiáng);H型鋼熱軋工藝過程數(shù)值分析及其仿真技術(shù)研究[D];山東大學(xué);2007年

相關(guān)碩士學(xué)位論文 前4條

1 何育軍;超高強(qiáng)度硼鋼熱沖壓工藝及模具優(yōu)化研究[D];西南交通大學(xué);2016年

2 董捷;高速鋼車刀淬火及深冷處理殘余應(yīng)力研究[D];浙江大學(xué);2014年

3 董峰;熱軋帶鋼層流冷卻過程板形研究[D];燕山大學(xué);2014年

4 顏飛;Q345E熱軋帶鋼軋后冷卻過程溫度及組織演變模擬[D];武漢科技大學(xué);2004年

，

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