本文選題：熱浸鍍鋁 + 預(yù)鍍工藝　； 參考：《西安建筑科技大學(xué)》2017年碩士論文

【摘要】：本文利用鞍鋼連續(xù)熱鍍鋅模擬器,主要研究了鍍前預(yù)電鍍Fe/Ni工藝以及鍍后過時(shí)效處理工藝對(duì)美鋼聯(lián)法連續(xù)熱浸鍍純鋁/鋁硅鍍層組織結(jié)構(gòu)和力學(xué)性能的影響以及各工藝在實(shí)際生產(chǎn)中應(yīng)用的可行性。同時(shí)采用多種模型對(duì)鍍層形成過程中的Fe-Al金屬間化合物的熱力學(xué)性質(zhì)與動(dòng)力學(xué)性質(zhì)進(jìn)行了計(jì)算與分析,進(jìn)一步明確鍍層的形成機(jī)理。最后通過ANSYS Workbench軟件對(duì)鍍層進(jìn)行了三點(diǎn)彎曲試驗(yàn)的有限元模擬計(jì)算,分析了鍍層的開裂形式以及力學(xué)加工性能的影響因素。研究結(jié)果表明:合金層形成過程中只可能同時(shí)存在Fe2Al5相與FeAl3相,Fe2Al5相首先在固液界面形核并長大并形成單相層,隨后FeAl3相才會(huì)在Fe2Al5相與鋁液界面形核。鍍后冷卻速度越快合金層厚度越薄,當(dāng)冷卻速度超過一定程度后減薄同樣的厚度所需的冷卻能力將會(huì)成倍增加,理想狀態(tài)下即使采用30℃/s的冷卻速度,合金層厚度依然≥5.6μm。預(yù)電鍍Ni工藝可以改善了鋁液的浸潤性,減小合金層厚度,提高II型鍍鋁板表面鋁層質(zhì)量。預(yù)電鍍Fe工藝會(huì)使得鍍層整體質(zhì)量較差,合金層厚度增加,局部出現(xiàn)裂紋和較大得空洞等缺陷,表面鋁層疏松多孔,鍍層表面十分粗糙。過時(shí)效處理工藝可以改善鍍鋁板鋼基體的塑韌性,但其會(huì)使得合金層厚度有小幅度增加,表面鋁層中微小孔隙等缺陷增多,此工藝應(yīng)該根據(jù)鍍鋁基材中的C、N原子含量進(jìn)行合理選擇。鍍鋁板在彎曲加工時(shí),合金層不論厚薄都必然會(huì)發(fā)生破碎斷裂產(chǎn)生微裂紋,鍍層在微裂紋處容易產(chǎn)生應(yīng)力集中而被破壞,下表面鍍層容易被拉裂,上表面鍍層容易擠出脫落,隨著合金層與基體厚度的增加,鍍層越容易被拉裂或擠出脫落,隨著表面鋁層厚度增加,裂紋越不容易擴(kuò)展貫穿整個(gè)表面鋁層,鍍層力學(xué)加工性能變好。
[Abstract]:In this paper, the continuous galvanizing simulator of Angang is used. In this paper, the effect of pre-plating Fe/Ni process before and after plating on the microstructure and mechanical properties of continuous hot-dip aluminum / aluminum-silicon coating by American steel couplet method and its feasibility in practical production were studied. At the same time, the thermodynamic and kinetic properties of Fe-Al intermetallic compounds in the process of coating formation were calculated and analyzed by various models, and the formation mechanism of the coating was further clarified. Finally, the finite element simulation of the three-point bending test was carried out by ANSYS Workbench software, and the cracking form and the influencing factors of mechanical processing properties of the coating were analyzed. The results show that during the formation of alloy layer, only Fe2Al5 phase and FeAl3 phase Fe _ 2Al _ 5 phase can nucleate and grow at the solid-liquid interface and form a single phase layer at the same time, and then the FeAl3 phase will nucleate at the interface between Fe2Al5 phase and liquid aluminum phase. The faster the cooling rate after plating is, the thinner the thickness of alloy layer is, and the cooling ability required for thinning the same thickness will increase exponentially when the cooling rate exceeds a certain degree. In ideal condition, the thickness of alloy layer is still more than 5.6 渭 m even if the cooling rate of 30 鈩，

本文編號(hào)：1799553