TC4钛合金大规格铸锭及棒材生产工艺研究

发布时间：2018-01-12 19:26

本文关键词：TC4钛合金大规格铸锭及棒材生产工艺研究　出处：《西安建筑科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：TC4钛合金属于典型的α+β两相钛合金,是目前研究和应用最成熟的钛合金。本文针对TC4大规格棒材(Φ200~Φ350 mm)及其应用需求开展相应的研究工作,主要对TC4钛合金大规格铸锭(Φ710~Φ940 mm)及大规格棒材的生产工艺进行了研究和优化,其技术关键是确保大规格铸锭的成分和组织均匀性、减少冶金缺陷、提高锻造变形和锻后组织的均匀性,以及减少加工缺陷提高棒材的探伤水平。在大规格铸锭生产工艺研究中,探讨了铸锭冶金缺陷产生的原因,针对TC4钛合金容易出现的正偏析,优化中间合金选择和加入方式;采用单块电极混料技术和真空等离子焊接技术制备大规格TC4钛合金自耗电极,制定了熔炼工艺路线和熔炼工艺参数,保证了合金元素在自耗电极中的均匀分布,减少了冶金缺陷。在大规格棒材生产工艺研究中,探讨了现有棒材不能满足使用要求的主要原因,摒弃了小坯料反复镦拔技术,制定了大单重棒材整体锻造工艺技术路线,减少了反复镦拔造成的不均匀变形和锻后组织缺陷,增加了棒材的长度,明显改善了棒材的探伤水平。本研究成果为TC4钛合金大规格铸锭和棒材的研制生产提供了技术保证,满足了我国航空领域钛合金大规格棒材的应用需求,对提高我国钛工业科研生产水平、增强国防力量有重要的意义。
[Abstract]:TC4 titanium alloy is a typical 伪尾 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.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG292;TG306;TG146.23

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