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  本文關鍵詞：TC4鈦合金大規(guī)格鑄錠及棒材生產工藝研究　出處：《西安建筑科技大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： TC4鈦合金 大規(guī)格鑄錠 熔煉工藝 大規(guī)格棒材 鍛造工藝

【摘要】：TC4鈦合金屬于典型的α+β兩相鈦合金,是目前研究和應用最成熟的鈦合金。本文針對TC4大規(guī)格棒材(Φ200~Φ350 mm)及其應用需求開展相應的研究工作,主要對TC4鈦合金大規(guī)格鑄錠(Φ710~Φ940 mm)及大規(guī)格棒材的生產工藝進行了研究和優(yōu)化,其技術關鍵是確保大規(guī)格鑄錠的成分和組織均勻性、減少冶金缺陷、提高鍛造變形和鍛后組織的均勻性,以及減少加工缺陷提高棒材的探傷水平。在大規(guī)格鑄錠生產工藝研究中,探討了鑄錠冶金缺陷產生的原因,針對TC4鈦合金容易出現的正偏析,優(yōu)化中間合金選擇和加入方式;采用單塊電極混料技術和真空等離子焊接技術制備大規(guī)格TC4鈦合金自耗電極,制定了熔煉工藝路線和熔煉工藝參數,保證了合金元素在自耗電極中的均勻分布,減少了冶金缺陷。在大規(guī)格棒材生產工藝研究中,探討了現有棒材不能滿足使用要求的主要原因,摒棄了小坯料反復鐓拔技術,制定了大單重棒材整體鍛造工藝技術路線,減少了反復鐓拔造成的不均勻變形和鍛后組織缺陷,增加了棒材的長度,明顯改善了棒材的探傷水平。本研究成果為TC4鈦合金大規(guī)格鑄錠和棒材的研制生產提供了技術保證,滿足了我國航空領域鈦合金大規(guī)格棒材的應用需求,對提高我國鈦工業(yè)科研生產水平、增強國防力量有重要的意義。
[Abstract]:TC4 titanium alloy is a typical 偽 尾 two-phase titanium alloy. It is the most mature titanium alloy studied and applied at present. In this paper, the corresponding research work is carried out according to the TC4 large specification bar (桅 200 ~ 桅 350mm) and its application requirements. The production process of large size ingot (桅 710 ~ 桅 940mm) and large specification bar of TC4 titanium alloy was studied and optimized. The key technology is to ensure the composition and structure uniformity of large size ingot, reduce metallurgical defects, and improve forging deformation and microstructure uniformity after forging. In the research of production technology of large specification ingot, the causes of metallurgical defects of ingot are discussed, and the positive segregation of TC4 titanium alloy is discussed. Optimizing the selection and addition of master alloy; Large scale TC4 titanium alloy consumable electrode was prepared by single electrode mixing technology and vacuum plasma welding technology. The melting process route and melting parameters were established. The uniform distribution of alloy elements in the consumable electrode is ensured, and the metallurgical defects are reduced. The main reasons why the existing bars can not meet the requirements of application are discussed in the research of the production process of large specification bar. The technology of small billet upsetting and drawing was abandoned, and the technical route of integral forging of large single bar was established, which reduced the uneven deformation caused by repeated upsetting and drawing, and increased the length of bar. The research results provide a technical guarantee for the development and production of TC4 titanium alloy large specification ingot and bar, and meet the application demand of titanium alloy large specification bar in aviation field of our country. It is of great significance to raise the level of scientific research and production of titanium industry in China and to strengthen the national defense force.
【學位授予單位】：西安建筑科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG292;TG306;TG146.23

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本文編號：1415673