發(fā)布時(shí)間：2018-06-04 05:07

  本文選題：430鐵素體不銹鋼冷軋帶鋼 + 臥式連續(xù)退火爐　； 參考：《北京科技大學(xué)》2015年博士論文

【摘要】：針對(duì)430鐵素體不銹鋼冷軋帶鋼在臥式爐內(nèi)的連續(xù)退火過(guò)程,通過(guò)實(shí)驗(yàn)和數(shù)值研究,建立了其在退火過(guò)程中的溫度、組織和力學(xué)性能預(yù)測(cè)模型。在本研究中利用高溫表面氣霧冷卻實(shí)驗(yàn)結(jié)果,并結(jié)合火焰爐內(nèi)對(duì)流換熱和輻射換熱的計(jì)算方法,建立了帶鋼在爐內(nèi)的溫度預(yù)測(cè)模型；采取等溫退火實(shí)驗(yàn)建立了430鐵素體冷軋帶鋼的再結(jié)晶動(dòng)力學(xué)和再結(jié)晶完成后的晶粒長(zhǎng)大動(dòng)力學(xué)模型；通過(guò)模擬退火實(shí)驗(yàn)的方法,研究了連續(xù)退火過(guò)程中帶鋼組織和性能演變規(guī)律,并建立了430鐵素體冷軋帶鋼在連續(xù)退火過(guò)程中的屈服強(qiáng)度和延伸率計(jì)算模型。在上述研究成果的基礎(chǔ)上,基于Sheil疊加原理,將溫度、組織和性能預(yù)測(cè)模型耦合,實(shí)現(xiàn)了實(shí)際退火過(guò)程的模擬和新退火工藝的制定。綜觀本文的研究工作,主要包括以下重要研究成果： (1)基于一維導(dǎo)熱反問(wèn)題的研究方法,搭建了高溫表面氣霧冷卻實(shí)驗(yàn)平臺(tái)。針對(duì)目前廣泛使用的某型號(hào)扇形氣霧噴嘴,研究了其在高溫不銹鋼表面的沸騰換熱規(guī)律,在水流量V≤0.83×10-5m3/s的范圍內(nèi)建立了沸騰換熱熱流密度計(jì)算關(guān)聯(lián)式。該研究成果一方面可以用于退火過(guò)程中帶鋼溫度的預(yù)測(cè)；另一個(gè)方面可研究不同操控條件下氣霧噴嘴在高溫表面的冷卻能力和冷卻均勻性,為提升帶鋼氣霧冷卻的開始冷卻溫度提供重要指導(dǎo)； (2)針對(duì)臥式連續(xù)退火爐,建立了爐內(nèi)帶鋼的一維非穩(wěn)態(tài)導(dǎo)熱模型,不同爐段的的換熱過(guò)程以邊界條件的形式進(jìn)行考慮。在加熱段內(nèi),利用輻射網(wǎng)絡(luò)圖法處理了帶鋼與爐氣和爐墻之間的換熱,根據(jù)經(jīng)驗(yàn)公式計(jì)算爐氣與帶鋼之間的對(duì)流換熱問(wèn)題。利用Holger Martin公式計(jì)算狹縫式噴氣冷卻情況下帶鋼表面對(duì)流換熱系數(shù)。利用噴霧冷卻實(shí)驗(yàn)得到的關(guān)列式計(jì)算噴霧冷卻區(qū)帶鋼表面熱流。經(jīng)過(guò)實(shí)驗(yàn)驗(yàn)證,模擬預(yù)測(cè)得到的爐內(nèi)帶鋼溫度誤差基本在±10%以內(nèi)； (3)通過(guò)等溫退火實(shí)驗(yàn)研究不同冷軋應(yīng)變量條件下430鐵素體不銹鋼冷軋帶鋼的再結(jié)晶過(guò)程,并建立了Avrami再結(jié)晶動(dòng)力學(xué)模型。利用等溫退火實(shí)驗(yàn),結(jié)合截線法得到了完全軟化后材料內(nèi)部的晶粒長(zhǎng)大規(guī)律,并分析了晶粒長(zhǎng)大過(guò)程中的織構(gòu)演變規(guī)律。利用該模型可對(duì)連續(xù)退火過(guò)程中冷軋帶鋼的晶粒尺度和軟化率/硬度進(jìn)行預(yù)測(cè)； (4)利用CCT-AV-Ⅱ模擬退火試驗(yàn)機(jī),研究了連續(xù)退火過(guò)程中帶鋼的組織和力學(xué)性能演變規(guī)律。利用所得到的實(shí)驗(yàn)結(jié)果,基于Hall-Peth公式,首次建立了430鐵素體冷軋帶鋼退火過(guò)程中的屈服強(qiáng)度和延伸率計(jì)算模型； (5)利用本文所建立的430鐵素體冷軋帶鋼在臥式爐連續(xù)退火爐內(nèi)的溫度、組織和力學(xué)性能預(yù)測(cè)耦合模型。對(duì)實(shí)際退火過(guò)程進(jìn)行模擬預(yù)測(cè),以評(píng)價(jià)實(shí)際退火過(guò)程中存在的問(wèn)題,并提出解決方案。針對(duì)特定的臥式連續(xù)退火爐,制定出了適用于不同規(guī)格430鐵素體冷軋帶鋼的退火工藝和操控參數(shù)。
[Abstract]:In view of the continuous annealing process of 430 ferrite stainless steel cold rolled strip steel in horizontal furnace, the prediction model of temperature, microstructure and mechanical properties of 430 ferrite stainless steel cold rolled strip steel during annealing process was established by experiment and numerical study. In this study, the temperature prediction model of strip steel in furnace is established by using the experimental results of high temperature surface aerosol cooling and the calculation method of convection heat transfer and radiation heat transfer in flame furnace. The kinetics of recrystallization and grain growth after recrystallization of 430 ferrite cold-rolled strip steel was established by isothermal annealing experiment. The evolution of microstructure and properties of 430 ferrite cold-rolled strip during continuous annealing was studied. The model of yield strength and elongation of 430 ferrite cold-rolled strip during continuous annealing was established. Based on the above research results and based on the Sheil superposition principle, the temperature, microstructure and properties prediction models are coupled to realize the simulation of the actual annealing process and the formulation of the new annealing process. The research work of this paper mainly includes the following important research results: 1) based on the research method of one-dimensional inverse problem of heat conduction, an experimental platform of high temperature surface aerosol cooling is built. The boiling heat transfer on the surface of high temperature stainless steel has been studied for a type of fan-shaped spray nozzle which is widely used at present. The correlation formula for calculation of boiling heat flux is established in the range of water flow rate V 鈮，

本文編號(hào)：1976075