Preparation of Ti60 high temperature titanium alloy ingot for aerospace
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摘要: 针对Ti60高温钛合金在熔炼工艺上的关键技术，选用等级较高的0A级军工小粒海绵钛以及合适的中间合金，采用真空自耗电弧炉熔炼，通过控制熔炼电流电压等关键工艺参数，制备出Ø310 mm大型Ti60高温钛合金铸锭。铸锭表面质量良好，没有出现冷隔和不到边等缺陷。经检测，各合金元素在铸锭上均匀分布，杂质元素含量以及分布控制较好，系统研究了以中间合金方式添加的Nb、Ta、Mo等高熔点元素以及低熔点元素Sn的配入方式和熔炼电流、熔炼电压等工艺参数对合金铸锭的成分均匀性以及缺陷控制的影响。此铸锭通过后续工序所制出的锻件，经过力学性能以及超声探伤，均达到了行业要求。Abstract: Aiming at the key technology of Ti60 high temperature titanium alloy preparation by smelting process, 0A grade military granulated sponge titanium and appropriate master alloy were selected to prepare Φ310 mm large Ti60 high temperature titanium alloy ingot, via vacuum consumable arc furnace smelting. The prepared ingot has a well surface quality without defects such as cold isolation and missing edge. The alloy elements are evenly distributed in the ingot, and the impurities content and distribution are well controlled. The effects of the mixing mode of high melting point elements such as Nb, Ta, Mo and low melting point elements such as Sn, melting current and voltage on composition uniformity and defect control of the alloy ingot were systematically studied. The forgings made from the ingot through subsequent processes have met the industrial and technical requirements through mechanical properties test and ultrasonic flaw detection.
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Key words:
- high temperature titanium alloy /
- Ti60 /
- master alloy /
- current /
- voltage /
- ingots /
- composition /
- uniformity
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图 1 Ti60高温钛合金生产工艺流程
Figure 1. Production process flow of Ti60 high temperature titanium alloy
图 3 Ti60铸锭（Ø310 mm）和熔炼过程
Figure 3. Ti60 ingot casting process (Ø310 mm) and melting process
图 4 数值模拟的熔炼过程的熔池固液相界面轮廓
Figure 4. Solid-liquid interface profile of molten pool through numerical simulation during smelting process
表 1 Ti60铸锭成分
Table 1. Composition of Ti60 ingot
% Al Mo Nb Sn Si Ta 5.68～5.75 0.470～0.485 0.324～0.341 3.42～3.53 0.459～0.475 0.91～1 Zr C H O N Fe 3.48～3.53 0.059～0.063 0.0008～0.001 0.079～0.085 0.076～0.081 0.02～0.021 
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