DZ22B高温合金定向凝固叶片铸造缺陷的形成机理研究  

Study on Formation Mechanism of Casting Defects in Directionally Solidified Blades of DZ22B Superalloy

作　　者：李振锋 胡兵 钟文惠 欧阳雪枚 李飞[3] 王鑫铭 雷四雄 周坚 尹付成 LI Zhenfeng;HU Bing;ZHONG Wenhui;OUYANG Xuemei;LI Fei;WANG Xinming;LEI Sixiong;ZHOU Jian;YIN Fucheng(AECC South Industry Co.,Ltd.,Zhuzhou 412000,China;School of Materials Science and Engineering,Xiangtan University,Xiangtan 411105,China;Shanghai Key Laboratory for High Temperature Materials and Precision Forming,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]中国航发南方工业有限公司,株洲412000 [2]湘潭大学材料科学与工程学院,湘潭411105 [3]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,上海200240

出　　处：《航空制造技术》2020年第16期45-49,58,共6页Aeronautical Manufacturing Technology

基　　金：中国航发自主创新专项资金项目(ZZCX-2017-045);“十三五”装备预研共用技术项目(41423040206);“十三五”两机重大专项(2017-VII-0008)。

摘　　要：采用SEM、EDS等分析手段研究了DZ22B镍基高温合金定向凝固涡轮叶片不同区域铸造缺陷的特点及其形成原因。结果表明,裂纹缺陷主要分布在叶身的中上部位,其形成机理主要归因于叶片在凝固过程中的共晶组织过多;而疏松缺陷分布在叶身和缘板部位,产生在枝晶间共晶组织附近。枝晶间距小补缩不足和反应生成的CO气体未及时排除是疏松形成的两大原因。The characteristics and the reason of its formation of casting defects in different areas of directional solidified turbine blades of DZ22B nickel base superalloy were investigated by means of SEM and EDS.The results show that the crack defects are mainly distributed in the middle and upper parts of the blade body,and its formation mechanism is mainly due to the excessive eutectic structure of the blade during the solidification process.While the loose defects are distributed in the blade body and the edge plate,and are generated in the dendrite near the eutectic structure.The small gap between dendrites and insufficient filling and the CO gas generated by the reaction not released in time are the two main reasons for the formation of looseness.

关 键 词：DZ22B高温合金 定向凝固叶片 陶瓷型壳 铸造缺陷 形成机理 

分 类 号：V263[航空宇航科学与技术—航空宇航制造工程]