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
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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.
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.
引文
[1]于保正,汤鑫,刘发信.细晶铸造K418B合金热处理工艺研究[J].航空材料学报,2002,22(3):13-21.
[2]袁文明,刘发信,汤鑫.铸型搅动法细晶铸造对K418B合金整体涡轮组织和力学性能的影响[J].航空材料学报,1998,18(4):19-25.
[3]于保正,汤鑫,刘发信.细晶铸造K418B合金热等静压工艺研究[J].机械工程材料,2003,27(3):24-26.
[4]Fei Wang,Fei Li,Bo He,et al.Gel-casting of fused silica based core packing for investment casting using silica sol as a binder[J].Journal of European Ce ramic Society,2013,33(13-14):2745-2749.
[5]尹庆玲.K403合金涡轮导向器的精密铸造工艺[J].铸造技术,2014,35(3):602-603.
[6]周志华,李维,吴剑涛,等.K414导向器精铸工艺研究[J].钢铁研究学报,2011,23(增2):438-441.
[7]黄艳松,马俊文,文柏衡,等.某发动机涡轮导向器精密整体叶盘铸造工艺研究[J].新技术新工艺,2012,(5):64-68.
[2]袁文明,刘发信,汤鑫.铸型搅动法细晶铸造对K418B合金整体涡轮组织和力学性能的影响[J].航空材料学报,1998,18(4):19-25.
[3]于保正,汤鑫,刘发信.细晶铸造K418B合金热等静压工艺研究[J].机械工程材料,2003,27(3):24-26.
[4]Fei Wang,Fei Li,Bo He,et al.Gel-casting of fused silica based core packing for investment casting using silica sol as a binder[J].Journal of European Ce ramic Society,2013,33(13-14):2745-2749.
[5]尹庆玲.K403合金涡轮导向器的精密铸造工艺[J].铸造技术,2014,35(3):602-603.
[6]周志华,李维,吴剑涛,等.K414导向器精铸工艺研究[J].钢铁研究学报,2011,23(增2):438-441.
[7]黄艳松,马俊文,文柏衡,等.某发动机涡轮导向器精密整体叶盘铸造工艺研究[J].新技术新工艺,2012,(5):64-68.