朱郎平,李建崇,张美娟,等.钛铝低压涡轮叶片熔模铸造精确成形及冶金缺陷分析[J].精密成形工程,2018,10(3):87-92.
ZHU Lang-ping,LI Jian-chong,ZHANG Mei-juan,et al.Precise Forming and Metallurgical Defects of TiAl Low Pressure Turbine Blade by Investment Casting[J].Journal of Netshape Forming Engineering,2018,10(3):87-92. |
| 钛铝低压涡轮叶片熔模铸造精确成形及冶金缺陷分析 |
| Precise Forming and Metallurgical Defects of TiAl Low Pressure Turbine Blade by Investment Casting |
| 投稿时间：2018-04-15 修订日期：2018-05-10 |
| DOI：10.3969/j.issn.1674-6457.2018.03.016 |
| 中文关键词: 熔模精密铸造 TiAl金属间化合物 低压涡轮叶片 重力浇注 冶金缺陷 |
| 英文关键词: investment casting TiAl intermetallics low pressure turbine blade gravity casting metallurgical defect |
| 基金项目:北京市科技计划专项(Z171100002217012)；国家自然科学基金(51671026)；装备预研基金(6140922020107) |
|
| 摘要点击次数: 4001 |
| 全文下载次数: 3151 |
| 中文摘要: |
| 目的 研究不同浇冒口设置对TiAl低压涡轮叶片的成形的影响及叶片冶金缺陷形成的原因。方法 采用熔模精铸方法，通过设计顶注式重力铸造浇注系统，采用冷坩埚感应熔炼炉进行TiAl叶片浇注实验，采用目视和X射线检验方法分析叶片铸件表面及内部缺陷，并结合金属凝固理论分析缺陷形成原因。结果 合理的浇口和排气孔设置有效避免了因熔体流动性差造成的叶片充型不完整，以及凝固收缩导致的应力开裂等问题，浇注出成形完整的铸造叶片；叶冠与叶身端部转角部位充型凝固过程中形成热节，容易出现贯穿性疏松缺陷；树脂基熔模焙烧后残留的碳黑在熔体充型凝固过程中，与面层中的ZrO2反应生产CO，导致叶身出现聚集性皮下气孔；由于凝固收缩引起叶身与铸型分离，降低横向散热能力，导致叶盆部位出现表面疏松。结论 通过浇注合理的浇注系统设置可实现TiAl叶片完整充型，疏松缺陷控制为进一步提高叶片质量的关键。 |
| 英文摘要: |
| The paper aims to study influences of different sprue and risers setting on forming of TiAl low pressure turbine blades and the reasons for its metallurgical defects. The investment casting method was adopted and top gating system of gravity casting was designed to carry out TiAl blade casting experiment with cold crucible induction melting furnace. Internal and external metallurgical defects were respectively inspected by visual inspection and X-ray inspection technology, and the cause of defect formation was deduced by metal solidification theory analysis. It was evitable to prevent misrun cause of low melt fluidity and cracking cause of shrinkage stress by setting up reasonable gate and vent, and acquire complete blade casting. Hot spot prone to form in the corner of the shroud and blade body during filling and solidification process, which lead to penetrating porous defects. Carbon black brought by sintering of residual resin reacted with ZrO2 in investment precoat, resulting in aggregated distribution of subsurface blowhole. Separation of the blade body and the mould caused by solidification shrinkage reduced the ability of transverse cooling, leading to formation of surface porosity. Complete filling of TiAl blades can be achieved by reasonable setting of pouring system. While the control of porous defects is the key to further improve the quality of the blades. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
渝公网安备 50010702501719号