【摘要】：熱加工作為一種常用的塑性成形方法,廣泛地應(yīng)用于鋁、鐵、鈦等合金零件的制備。而動(dòng)態(tài)再結(jié)晶(Dynamic recrystallization,DRX)作為熱加工中重要的晶粒細(xì)化和軟化機(jī)制,對(duì)于材料變形組織控制、塑性成形能力改善和成形工藝(如鍛造、擠壓、沖壓等)優(yōu)化具有重要的工程應(yīng)用價(jià)值。傳統(tǒng)采用的理論與實(shí)驗(yàn)的研究方法無(wú)法實(shí)時(shí)定量地獲得材料微觀組織的演化信息,元胞自動(dòng)機(jī)(Cellular Automaton,CA)因具有作用規(guī)則簡(jiǎn)單,計(jì)算高效以及具有真實(shí)的物理意義,故被廣泛地應(yīng)用于金屬材料動(dòng)態(tài)再結(jié)晶過(guò)程的組織演化模擬中。V-10Cr-5Ti合金具有良好的抗輻照性能、抗氫脆性、耐熱性、可加工性,同時(shí)具有強(qiáng)度高和熱膨脹性低等優(yōu)良性能,是核聚變反應(yīng)堆的候選材料。本研究采用元胞自動(dòng)機(jī)法研究V-10Cr-5Ti合金熱變形過(guò)程的微觀組織演化,探究其DRX行為及工藝參數(shù)對(duì)顯微組織演變規(guī)律的影響。通過(guò)V-10Cr-5Ti合金的等溫?zé)釅嚎s實(shí)驗(yàn)獲得變形溫度950~1350℃、應(yīng)變速率0.01~10s-1范圍內(nèi)的流動(dòng)應(yīng)力曲線,研究了其熱塑性流動(dòng)特點(diǎn)。建立了包含應(yīng)變的雙曲正弦Arrhenius模型,并對(duì)模型預(yù)測(cè)的效果開展了評(píng)估,結(jié)果表明所建立的本構(gòu)模型具有良好的預(yù)測(cè)精度,適用于CA法模擬微觀組織演化的研究。構(gòu)建了CA法基礎(chǔ)模型并耦合了材料物理過(guò)程的內(nèi)在規(guī)則作用模型,如:熱激活原則、晶界遷移、曲率驅(qū)動(dòng)和能量耗散。開發(fā)與調(diào)試初始化組織程序,生成初始化組織。初始化模擬結(jié)果與實(shí)驗(yàn)對(duì)比,結(jié)果發(fā)現(xiàn)兩者具有較好的一致性,驗(yàn)證所建立的CA模型的準(zhǔn)確性與適用性,同時(shí)也為后續(xù)V-10Cr-5Ti合金DRX研究開展奠定了理論基礎(chǔ)。構(gòu)建了V-10Cr-5Ti合金熱塑性變形過(guò)程中的拓?fù)鋵W(xué)模型,對(duì)試樣的不同變形區(qū)進(jìn)行了驗(yàn)證,結(jié)果顯示兩者吻合良好,同時(shí)對(duì)不同變形區(qū)晶粒的形態(tài)學(xué)開展了分析。在所建立的位錯(cuò)密度模型、再結(jié)晶形核模型、晶粒長(zhǎng)大模型和臨界位錯(cuò)密度模型的基礎(chǔ)上,開發(fā)了基于元胞自動(dòng)機(jī)的V-10Cr-5Ti合金DRX過(guò)程組織模擬演化的核心程序。利用所建立的模型,實(shí)現(xiàn)了對(duì)不同工藝參數(shù)下顯微組織演變的數(shù)值模擬,結(jié)合顯微組織觀察,結(jié)果表明模擬與實(shí)驗(yàn)數(shù)據(jù)誤差較小,說(shuō)明所建立的CA模型能夠較好地適用于V-10Cr-5Ti合金DRX過(guò)程組織演化的預(yù)測(cè)。此外,基于此模型,研究了不同初始晶粒尺寸、變形溫度、應(yīng)變速率以及應(yīng)變量等參數(shù)對(duì)V-10Cr-5Ti合金DRX過(guò)程的影響,闡明了DRX過(guò)程中工藝對(duì)組織演化的內(nèi)在機(jī)理。
[Abstract]:As a common plastic forming method, hot working is widely applied to the preparation of alloy parts such as aluminum, iron, titanium and the like. Dynamic Recrystallization (DRX), as an important grain refining and softening mechanism in hot working, has important engineering application value for the optimization of material deformation tissue, the improvement of the plastic forming ability and the optimization of the forming process (such as forging, extrusion, stamping, etc.). The traditional theory and experimental research method can not quantitatively obtain the evolution information of the micro-structure of the material in real time, and the cellular automaton (CA) has the advantages of simple rule, high calculation efficiency and real physical significance. And is widely applied to the tissue evolution simulation of the dynamic recrystallization process of the metal material. The V-10Cr-5Ti alloy has good anti-irradiation property, hydrogen embrittlement resistance, heat resistance and processability, and has excellent properties such as high strength and thermal expansion, and is a candidate material for nuclear fusion reactor. The microstructure evolution of the thermal deformation of V-10Cr-5Ti alloy is studied by the cellular automaton method, and the influence of the DRX behavior and process parameters on the evolution of the microstructure is investigated. The flow stress curves in the range of 950 to 1350.degree. C. and the strain rate of 0.01 to 10 s-1 were obtained by isothermal compression experiments of V-10Cr-5Ti alloy, and the characteristics of the thermoplastic flow were studied. The hyperbolic sine Arrhenius model with strain is established, and the effect of the model prediction is evaluated. The results show that the established constitutive model has good prediction precision and is suitable for the research of the simulation of microstructure evolution by the CA method. The basic model of CA method is built and the internal regular function model of material physical process is coupled, such as thermal activation principle, grain boundary migration, curvature driving and energy dissipation. Develop and debug the initialization organization program to generate the initialization organization. The simulation results are compared with the experiment, and the result shows that the two have good consistency, and the accuracy and the applicability of the established CA model are verified, and the theoretical basis for the follow-up V-10Cr-5Ti alloy DRX research is also established. In this paper, the mechanical model of V-10Cr-5Ti alloy is constructed, and the different deformation areas of the sample are verified. The results show that the two are in good agreement with each other, and the morphology of the grains in different deformation areas is analyzed. On the basis of the established dislocation density model, the recrystallization nucleation model, the grain growth model and the critical dislocation density model, the core program for the simulation and evolution of the V-10Cr-5Ti alloy DRX process based on the cellular automaton was developed. The numerical simulation of microstructure evolution under different process parameters is realized by using the established model, and the results show that the simulation and experimental data error are small, and the established CA model can be well applied to the prediction of the evolution of the V-10Cr-5Ti alloy DRX process. In addition, on the basis of this model, the influence of different initial grain size, deformation temperature, strain rate and the corresponding variable on the DRX process of V-10Cr-5Ti alloy is studied, and the internal mechanism of the process to the evolution of the structure in the DRX process is clarified.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG146.413;TG306

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 Ya-Ping Li;Ren-Bo Song;Er-Ding Wen;Fu-Qiang Yang;;Hot Deformation and Dynamic Recrystallization Behavior of Austenite-Based Low-Density Fe Mn Al C Steel[J];Acta Metallurgica Sinica(English Letters);2016年05期

2 Xin-gang LIU;Li-ge ZHANG;Rong-sheng QI;Lei CHEN;Miao JIN;Bao-feng GUO;;Prediction of Critical Conditions for Dynamic Recrystallization in 316LN Austenitic Steel[J];Journal of Iron and Steel Research(International);2016年03期

3 高志剛;郭鴻鎮(zhèn);苗小浦;姚澤坤;;協(xié)同K-M和E-M準(zhǔn)則的TC18鈦合金高溫變形加工硬化行為[J];材料熱處理學(xué)報(bào);2015年S2期

4 李魚飛;王震宏;張林英;羅超;賴新春;;熱壓縮V-5Cr-5Ti合金的Arrhenius本構(gòu)方程和動(dòng)態(tài)再結(jié)晶行為（英文）[J];Transactions of Nonferrous Metals Society of China;2015年06期

5 李增德;林晨光;崔舜;;V-5Cr-5Ti合金的熱變形行為及加工圖[J];稀有金屬;2015年03期

6 韓亞瑋;蘇娟華;任鳳章;魏世忠;陳志強(qiáng);;應(yīng)用Laasraoui-Jonas位錯(cuò)密度模型模擬工業(yè)純鈦微觀組織演變[J];材料熱處理學(xué)報(bào);2014年11期

7 楊彪;王麗閣;王恩澤;;聚變用V-Cr-Ti合金的研究進(jìn)展[J];材料導(dǎo)報(bào);2014年05期

8 劉筱;朱必武;李落星;;Laasraoui-Jonas位錯(cuò)密度模型結(jié)合元胞自動(dòng)機(jī)模擬AZ31鎂合金動(dòng)態(tài)再結(jié)晶[J];中國(guó)有色金屬學(xué)報(bào);2013年04期

9 陳先華;汪小龍;張志華;;鎂合金動(dòng)態(tài)再結(jié)晶的研究現(xiàn)狀[J];兵器材料科學(xué)與工程;2013年01期

10 姜科;孫圣潔;;動(dòng)態(tài)再結(jié)晶臨界判據(jù)和機(jī)理的研究[J];有色金屬加工;2009年06期

相關(guān)博士學(xué)位論文 前4條

1 李魚飛;V-5Cr-5Ti合金的熱壓縮動(dòng)態(tài)再結(jié)晶行為[D];中國(guó)工程物理研究院;2015年

2 季海鵬;基于元胞自動(dòng)機(jī)法的316LN不銹鋼動(dòng)態(tài)再結(jié)晶組織預(yù)測(cè)[D];燕山大學(xué);2013年

3 禹寶軍;二相粒子材料動(dòng)態(tài)再結(jié)晶行為的元胞自動(dòng)機(jī)模型及其模擬研究[D];山東大學(xué);2012年

4 陳飛;熱鍛非連續(xù)變形過(guò)程微觀組織演變的元胞自動(dòng)機(jī)模擬[D];上海交通大學(xué);2012年

相關(guān)碩士學(xué)位論文 前4條

1 祝培培;基于元胞自動(dòng)機(jī)法的Ti-55高溫鈦合金熱變形過(guò)程組織模擬[D];哈爾濱工業(yè)大學(xué);2016年

2 羅平;GH4169合金熱變形動(dòng)態(tài)再結(jié)晶模擬[D];東北大學(xué);2014年

3 齊珂;核電用鋼316LN動(dòng)態(tài)再結(jié)晶行為實(shí)驗(yàn)研究與數(shù)值模擬[D];上海交通大學(xué);2014年

4 李魚飛;V-4Cr-4Ti合金的制備及組織結(jié)構(gòu)研究[D];中國(guó)工程物理研究院;2008年

，

本文編號(hào)：2502467