本文關(guān)鍵詞： 鋁合金中厚板 異步軋制 形變 翹曲 力學(xué)性能　出處：《北京科技大學(xué)》2016年博士論文　論文類型：學(xué)位論文

【摘要】：異步軋制作為一種可引入劇烈附加剪切變形而使板材心部缺陷消除、厚向組織及性能均勻性獲得改善的加工技術(shù)被廣泛應(yīng)用于薄板帶材生產(chǎn)和研究。然而異步軋制過程中存在的板材翹曲問題限制了其在中厚板軋制生產(chǎn)中的應(yīng)用。因此在確保異步軋制引入劇烈剪切變形的同時(shí),最小化或消除板材翹曲現(xiàn)象成為其應(yīng)用于中厚板生產(chǎn)需解決的關(guān)鍵問題。本文利用有限元數(shù)值模擬和實(shí)驗(yàn)研究了異步軋制中厚鋁板的變形行為及關(guān)鍵工藝參數(shù)對(duì)組織演化的影響,并基于關(guān)鍵異步軋制工藝參數(shù)對(duì)翹曲的影響,發(fā)現(xiàn)多軋制參數(shù)間的關(guān)聯(lián)規(guī)律,獲得無翹曲或翹曲最小化異步軋制控制原理和工藝,實(shí)現(xiàn)了無翹曲連續(xù)化異步軋制和板材制備,明顯提高板材的綜合力學(xué)性能。主要結(jié)論如下：模擬研究發(fā)現(xiàn),異步軋制變形區(qū)內(nèi)板材受到的總剪切變形是前滑區(qū)引入的正剪切變形和后滑區(qū)引入的負(fù)剪切變形共同作用結(jié)果,使多道次異步軋板獲得更高剪切變形,尤其軋板心部剪切應(yīng)變由同步軋制的0.026提高到0.836。采用刻蝕“標(biāo)志線”法研究異步軋制鋁合金中厚板材的宏觀變形行為發(fā)現(xiàn),多道次異步軋制可大幅提高板厚向的剪切和等效應(yīng)變,而同步軋制的剪切變形只集中于板材表面。雖然異步軋板表面應(yīng)變的增加遠(yuǎn)高于心部并導(dǎo)致應(yīng)變分布不均勻性增加,但由于異步軋板心部剪切與壓縮變形的大小處同一量級(jí),故該應(yīng)變不均勻性未顯著增加后續(xù)組織不均勻性。總壓下量一定,減少道次壓下量可累積更多附加剪切變形,并大幅提高板厚向變形均勻性。采用10-30%的異步軋制道次壓下量可獲得厚向均勻分布的細(xì)小晶粒,明顯改善T6態(tài)延伸率及其厚向均勻性。針對(duì)異步軋制變形路徑的研究發(fā)現(xiàn),ASR-R變形路徑可通過道次間附加剪切變形的相互交叉促進(jìn)變形向板材心部深入,從而提高板厚向變形及組織均勻性�；诋惒杰埌迓N曲曲率與關(guān)鍵工藝參數(shù)間演變規(guī)律的研究,構(gòu)建了異步軋板實(shí)現(xiàn)“變曲”現(xiàn)象所需臨界道次壓下量與異速比、軋輥輥徑和軋板初始厚度間的關(guān)聯(lián)工藝圖及經(jīng)驗(yàn)關(guān)系式;利用所獲無翹曲異步軋制工藝原理,首次實(shí)現(xiàn)了40mm7050中厚板的無翹曲連續(xù)異步軋制,獲得了板型平直的異步軋板,其T6態(tài)延伸率、LT和TL方向上的斷裂韌性均較同步軋板明顯提高。
[Abstract]:Asynchronous rolling as a kind of severe additional shear deformation can be introduced to eliminate plate core defects. The processing technology of improving the homogeneity of thick structure and properties has been widely used in the production and research of thin plate and strip. However, the warpage problem in asynchronous rolling process limits its application in the production of medium and thick plate. Therefore, while ensuring the introduction of severe shear deformation in asynchronous rolling. Minimizing or eliminating the warpage is the key problem to be solved in plate production. In this paper, finite element numerical simulation and experiment are used to study the deformation behavior and key process parameters of asynchronous rolling medium and thick aluminum plate. The influence of organizational evolution. Based on the influence of key parameters of asynchronous rolling on warpage, the correlation rule of multi-rolling parameters is found, and the control principle and process of non-warpage or warpage minimization are obtained. Non-warping continuous asynchronous rolling and plate preparation can obviously improve the comprehensive mechanical properties of the plate. The main conclusions are as follows: simulation research found. The total shear deformation of plate in the deformation zone of asynchronous rolling is the result of both the positive shear deformation introduced by the front slip zone and the negative shear deformation introduced by the backward slip zone, which makes the multi-pass asynchronous rolling plate obtain higher shear deformation. Especially, the shear strain in the center of rolling plate was increased from 0.026 to 0.836. The macroscopic deformation behavior of asynchronous rolling aluminum alloy plate was studied by etching "mark line" method. Multi-pass asynchronous rolling can greatly increase the thickness shear and equivalent strain of the plate. While the shear deformation of synchronous rolling is only concentrated on the surface of the plate, although the increase of strain on the surface of asynchronous rolling plate is much higher than that of the center, which results in an increase in the uneven distribution of the strain. However, due to the same order of magnitude of shear and compression deformation in the center of asynchronous rolling plate, the strain inhomogeneity does not significantly increase the inhomogeneity of subsequent microstructure, and the total reduction is constant. Reducing pass reduction can accumulate more additional shear deformation and greatly improve the uniformity of plate thickness deformation. The fine grains with uniform thickness distribution can be obtained by using 10-30% of the secondary reduction of pass in asynchronous rolling. The elongation of T6 state and its thickness uniformity are obviously improved. The ASR-R deformation path can promote the deformation to the center of the plate through the intersecting of the additional shear deformation between the passes. In order to improve the thickness deformation and microstructure uniformity of the plate, based on the asynchronous rolling plate warpage curvature and key process parameters of the evolution of the study. The correlation process diagram and empirical relation between the critical pass reduction rate and the different speed ratio, the roll diameter and the initial thickness of the rolling plate are constructed for the realization of "bending" phenomenon in asynchronous rolling plate. Based on the principle of non-warping asynchronous rolling, 40mm 7050 plate without warping has been rolled continuously for the first time, and the straight plate has been obtained, and its T6 elongation has been obtained. The fracture toughness of LT and TL direction is obviously higher than that of synchronous rolling plate.
【學(xué)位授予單位】：北京科技大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TG339

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