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熔模铸造工艺对K418B涡轮导向器充型性能与晶粒组织的影响
Effect of Investment Casting Process on Filling Performance and Grain Structure of K418B Turbine Guide
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- DOI:
- 作者:
- 李飞 侯正乾 赵彦杰 郝新 李振锋 周坚
LI Fei;HOU Zhengqian;ZHAO Yanjie;HAO Xin;LI Zhenfeng;ZHOU Jian
- 作者单位:
- 上海交通大学上海市先进高温材料及其精密成形重点实验室 中国航发南方工业有限公司
Shanghai Key Laboratory for High Temperature Materials and Precision Forming,Shanghai Jiao Tong University,Shanghai 200240,China;National South Aviation Industry Co.,Ltd.,Zhuzhou 412000,China
- 关键词:
- 镍基高温合金 涡轮导向器 陶瓷型壳 充型性能 晶粒组织
Nickel-based superalloy turbine guide ceramic shell filling performance grain structure
- 摘要:
- 研究了熔模铸造浇注系统、浇注温度、型壳预热温度对K418B涡轮导向器在重力铸造条件下充型性能与晶粒组织的影响。结果表明,在调整浇注工艺的基础上,将排气边一侧的型壳外部加厚的方式,改变了型腔的温度场分布,使导向器叶片的排气边冷却速度降低;一方面保证了排气边的充型完整性,另一方面降低了排气边与叶身厚大部位的温度梯度,使整个叶片的晶粒组织由大尺寸柱状晶转变成较细小的等轴晶,提升了导向器的综合力学性能。The effects of investment casting pouring system, pouring temperature and shell preheating temperature on filling performance and grain structure of K418 B turbine guide under gravity casting were studied. The results show that on the basis of adjusting the casting process, the temperature field distribution of the cavity is changed by thickening the outer shell of the exhaust side to reduce the cooling speed of the exhaust side of the guide vanes. On the one hand, the filling integrity of the exhaust edge is guaranteed, and on the other hand, the temperature gradient between the exhaust edge and the bulk of the blade thickness is reduced. The grain structure of the whole blade is changed from large size columnar crystal to smaller equiaxed crystal, which improves the comprehensive mechanical properties of the guide.