本文選題：寬幅AZ31 + 大壓下軋制��； 參考：《燕山大學》2015年碩士論文

【摘要】：航空、航天、武器裝備、大型船舶和高速列車的輕量化需求對寬幅鎂合金板材及其組合件代替鋼板和塑料的需求量將越來越大,因此開發(fā)大尺寸寬幅鎂合金板材具有重要的戰(zhàn)略意義。鎂合金板帶軋制是研究變形鎂合金中的重要方向,以較高的軋制溫度來進行大壓下率軋制,使鎂合金在軋制中產生完全動態(tài)再結晶,以此來得到組織均勻細小和力學性能優(yōu)良的產品,這樣既提高了生產效率,又降低了生產成本,具有比較高的現(xiàn)實意義。且溫度是鎂合金板帶軋制過程中最重要的工藝參數(shù),直接影響著軋制時金屬的動態(tài)再結晶過程以及塑性變形機制,從而影響其最終組織和性能。因此研究板帶在軋制過程中的溫度變化和內部溫度分布規(guī)律是保證軋制成品質量的前提。在軋制過程中,有必要調整并且控制好軋制溫度以此來得到符合性能要求的成品。本課題的研究目的就是運用實驗法以及數(shù)值模擬法對寬幅鎂合金薄板大壓下率軋制過程中溫度場的變化規(guī)律進行研究。利用Gleeble-3800熱模擬試驗機,進行高溫壓縮熱模擬實驗,得到流變應力曲線,為后續(xù)有限元軟件模擬軋制過程以及理論分析提供可靠數(shù)據(jù)支持。并且進行平面應變壓縮實驗,模擬軋制過程。通過金相試驗,測試在不同壓下率以及軋制溫度下軋制后試樣的組織變化規(guī)律,得到鎂合金的最佳軋制工藝參數(shù)。運用MSC.Marc建立三維軋制模型對鎂合金薄板軋制過程軋制溫度、壓下率、軋輥預熱溫度以及板帶寬度等不同工藝參數(shù)進行數(shù)值模擬,初步探析研究鎂合金軋制較適合的壓下率。然后分析大壓下率軋制過程中溫度場沿板帶寬度方向的變化規(guī)律,研究鎂合金板帶軋制過程中的傳熱機理,建立溫度模型以對鎂合金熱軋進行最優(yōu)溫度控制。針對軋制過程中板帶邊部溫降的現(xiàn)象,并改善由于邊部溫降引起的邊裂問題,提出板帶邊部感應加熱來達到邊部溫度回升,對板帶邊部溫度進行補償,并建立電磁熱耦合模型來分析邊部溫度變化。
[Abstract]:The demand for lightweight aerospace, aerospace, weapons, large ships and high-speed trains will be increasing for wide-width magnesium alloy sheets and their assemblies instead of steel plates and plastics. Therefore, the development of large-size and wide-width magnesium alloy sheet has important strategic significance. The rolling of magnesium alloy strip is an important direction in the research of wrought magnesium alloy. With high rolling temperature, the rolling of magnesium alloy can produce complete dynamic recrystallization. In this way, the products with fine and uniform structure and excellent mechanical properties can be obtained, which not only improves the production efficiency but also reduces the production cost, so it has higher practical significance. The temperature is the most important technological parameter in the rolling process of magnesium alloy sheet and strip, which directly affects the dynamic recrystallization process and plastic deformation mechanism of the metal during rolling, thus affecting the final microstructure and properties. Therefore, it is the premise to study the temperature change and internal temperature distribution in the rolling process to ensure the quality of the finished product. In the process of rolling, it is necessary to adjust and control the rolling temperature to get the finished product. The purpose of this paper is to study the variation of temperature field in the process of high reduction rate rolling of wide magnesium alloy sheet by means of experimental method and numerical simulation method. The flow stress curve is obtained by using Gleeble-3800 thermal simulation machine to simulate the high temperature compression heat, which provides reliable data for the subsequent finite element software to simulate the rolling process and theoretical analysis. And the plane strain compression experiment was carried out to simulate the rolling process. By means of metallographic test, the microstructure changes of the samples after rolling at different reduction rates and rolling temperatures were measured, and the optimum rolling process parameters of magnesium alloys were obtained. The rolling temperature, reduction rate, roll preheating temperature and strip width of magnesium alloy sheet were numerically simulated by MSC.Marc. The suitable rolling rate of magnesium alloy rolling was studied. Then, the variation law of temperature field along the width of strip during high reduction rate rolling is analyzed, the heat transfer mechanism in the rolling process of magnesium alloy strip is studied, and the temperature model is established to control the optimal temperature of hot rolling of magnesium alloy. In view of the phenomenon of temperature drop on the edge of the strip during rolling, and to improve the edge crack caused by the temperature drop of the edge, it is put forward that the induction heating of the edge of the strip is used to recover the temperature of the edge, and the temperature of the edge of the plate is compensated. An electromagnetic-thermal coupling model is established to analyze the temperature variation of the edge.
【學位授予單位】：燕山大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG339

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