A new vacuum-assisted low-pressure investment casting process for K446 alloy  

作　　者：Lan-bo Ma Wen-jin Cheng Xin-li Guo Bing-zheng Fan Yang Guan Yi-peng Li Lei Jin Guo-yan Shui Yi-zhong Jiang Xun Sun 

机构地区：[1]Shenyang Research Institute of Foundry Co.,Ltd.CAM,State Key Laboratory of Advanced Casting Technologies,Shenyang 110022,China [2]Xi'an XAE Flying Aviation Manufacturing Technology Co.,Ltd.,Xi'an 710021,China

出　　处：《China Foundry》2024年第6期702-708,共7页中国铸造（英文版）

基　　金：financially supported by the National Key Research and Development Plan Project of the Ministry of Science and Technology:Intelligent Liquid Precision Casting Technology and Application of Large Complex Thin-Wall High-End Metal Components(No.2022YFB3706800).

摘　　要：Non-metallic inclusions and zyglo indications frequently occur in the superalloy castings produced through the traditional vacuum gravity investment casting process,particularly in components with thin-walled and complex structural features.The vacuum-assisted low-pressure casting(VLC),a type of counter-gravity casting(CGC)method,has been developed to minimize non-metallic inclusions and zyglo indications in superalloy castings.Rectifying frames for gas turbines made from K446 alloy were produced semi-continuously using the VLC process and subsequently evaluated through tensile testing,chemical composition analysis,X-ray diffraction,and zyglo penetrant inspection.The results indicate a roughly 10%improvement in tensile strength at 800℃ compared to gravity casting.Moreover,no significant changes are observed in the chemical composition of the alloys from the beginning to the end of a casting campaign,indicating that the developed VLC process is viable for the engineering-scale production of superalloy castings.Compared to traditional vacuum gravity casting(GC)method,the application of VLC can reduce the numbers of non-metallic inclusions and Zyglo indications in the castings by over 80%.At the same time,it significantly shortens the production time by 3 to 5 days.

关 键 词：K446 alloy rectifying frame investment casting vacuum-assisted low-pressure casting process 

分 类 号：TG146.15[一般工业技术—材料科学与工程]