航空发动机用导向叶片叶身裂纹形成机制研究  

Research on Crack Forming Mechanism of Guide Vane for Aero Engine

作　　者：吴廷宝[1] 于兴福[2] 李波[1] 曲殿鹏 王铁军[1] 

机构地区：[1]中航工业沈阳黎明航空发动机(集团)有限责任公司,辽宁沈阳110043 [2]沈阳工业大学材料科学与工程学院,辽宁沈阳110870

出　　处：《铸造》2013年第2期156-158,163,共4页Foundry

摘　　要：通过对K441合金导向叶片铸件出现的铸造裂纹及磨削裂纹的观察,并对裂纹处的析出相进行了能谱分析,确定了该导向叶片铸造裂纹和磨削裂纹的形成原因。K441合金导向叶片铸造裂纹的形成与铸件凝固期间补缩能力及合金中C元素含量密切相关。K441合金凝固过程中,除正常枝晶搭接外,在枝晶间析出的碳化物相阻塞了补缩通道,削弱了凝固前沿的界面强度,从而促进热裂纹的产生。合金中碳化物在晶界的析出使叶片磨削裂纹沿晶界形成和长大,并最终导致叶片报废。通过在叶片隔板上增加与冒口相连的补缩通道部分解决了叶片形成疏松和裂纹的问题,而磨削裂纹要通过调整碳化物的析出量和析出形态来解决。By means of observing casting and grinding cracks in K441 alloy guide vane, and analyzing the energy spectrum of precipitates nearby the cracks, we identified the formation reason of casting crack and grinding crack. The results show that the crack formation was closely related to feeding capacity and alloy element C content in vane during solidification of K441 alloy. During solidification, besides the normal dendrite coherency, carbides precipitated phase in interdendritic not only blocked the feeding channel, but also weakened the strength in the front of solidification interface, thereby facilitating the heat crack. The carbide precipitated near the grain boundaries resulting grinding crack formation and growth, which eventually led to the discard. The forming shrinkage and crack problems were solved by connecting feeding channel between blade plate and riser. The grinding cracks need to be solved by adjusting amount and morphology of carbide precipitation.

关 键 词：导向叶片 铸造裂纹 磨削裂纹 碳化物 

分 类 号：V232.4[航空宇航科学与技术—航空宇航推进理论与工程]