...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Proceedings of the institution of mechanical engineers >The influence of face coat material on reactivity and fluidity of the Ti6Al4V and TiAl alloys during investment casting
【24h】

The influence of face coat material on reactivity and fluidity of the Ti6Al4V and TiAl alloys during investment casting

机译：熔敷过程中表面涂层材料对Ti6Al4V和TiAl合金反应性和流动性的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Ti6Al4V alloy belongs to the most significant alloys within the conventional titanium alloys, namely for producing turbochargers impellers and human prostheses. TiAl alloys, because of its attractive properties, such as half density of any nickel-based alloys and excellent high temperature properties, exhibit excellent potential for aerospace turbines and turbocharger turbines application. Investment casting is a near net shape process with great interest for these kind of complex parts, but the processing of these alloys using this technique is still a challenge. In spite of these advantages, these alloys are highly reactive in their molten state, reacting with the ceramic shells used in investment casting, forming a hardened and brittle layer called alpha case on the cast alloy surface, rich in interstitial elements such as oxygen. It is commonly accepted that yttria-based face coats are the best solution for minimizing metal mold reaction, but this ceramic oxide is very expensive. So, the aim of this work is to test alternative materials to produce ceramic shells face coats. A test sample simulating both compressor wheels and turbines was developed and assembled in a wax tree for alpha case and fluidity evaluation. Reactivity studies were conducted based on microhardness measurements and microstructural analysis of gamma-TiAl and Ti6Al4V standard test samples, casted in shells with different face coat materials: fused Y2O3, ZrSiO4, Al2O3, yttria (6%) stabilized ZrO2 and yttria stabilized ZrO2 with 10% fine Y2O3 (3-7 mu m). The results obtained showed that fused Y2O3 face coat eliminates the alpha case, although affecting the fluidity, and gamma-TiAl castings have more misruns blades than Ti6Al4V castings.
机译：Ti6Al4V合金属于常规钛合金中最重要的合金，即用于生产涡轮增压器叶轮和人体假体的合金。 TiAl合金具有吸引人的特性，例如任何镍基合金的半密度和出色的高温特性，因此在航空航天涡轮机和涡轮增压器涡轮机的应用中显示出极好的潜力。熔模铸造是一种接近最终形状的工艺，对这类复杂零件很有兴趣，但是使用这种技术加工这些合金仍然是一个挑战。尽管具有这些优点，但这些合金在熔融状态下具有高反应性，可与熔模铸造中使用的陶瓷壳反应，在铸造合金表面形成称为α壳的硬化脆性层，其中富含诸如氧的间隙元素。氧化钇基面涂层是使金属模具反应最小化的最佳解决方案，这是公认的，但是这种陶瓷氧化物非常昂贵。因此，这项工作的目的是测试替代材料以生产陶瓷壳面涂层。开发了一个模拟压气机叶轮和涡轮机的测试样品，并将其组装在蜡树中，以进行alpha情况和流动性评估。基于γ-TiAl和Ti6Al4V标准测试样品的显微硬度测量和显微结构分析，进行了反应性研究，这些样品浇铸在具有不同面涂层材料的壳中：熔融的Y2O3，ZrSiO4，Al2O3，氧化钇（6％）稳定的ZrO2和氧化钇稳定的ZrO2与10细Y 2 O 3（3-7μm）的％。获得的结果表明，尽管会影响流动性，但熔融的Y2O3面涂层消除了Alpha情况，并且与Ti6Al4V铸件相比，γ-TiAl铸件的叶片失误更多。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号