Effect of Carbon Content on the Microstructure of As-cast Superalloy
Author of the article:LIU Congqing;ZHAO Wenxue;WANG Fan;ZHANG Lei;CHEN Jin;LIU Bo
Author's Workplace：National Technology Centre,Chongqing Pump Industry Co.,Ltd.,Chongqing 400030,China
Key Words：directionally solidified Ni-base superalloys carbon additions as-cast microstructure porosity carbides
Abstract：
In order to study the effect of carbon additions on the as-cast microstructure of a superalloy,the sample of the superalloy with different carbon were prepared by Bridgeman technology.The results show that the primary and secondary dendrite arm spacing is not significantly altered with the addition of carbon increase from 0.05%to 0.18%;with carbon addition increased,the volume fraction ofγ-γ′eutectic both decreased,meanwhile the volume fraction of carbides increased;the carbides formed in all alloys appeared script-type morphology and the orientation relationships between the carbides and the matrix were(001)γ//(001)TiCand<001>γ//<001>TiC.Higher carbon content promote the formation cript-type morphology MC.In addition,with the carbon addition increasing,the number and the volume fraction of porosity represent the trend of decreasing first and increasing afterwards.the number and the volume is the least when the carbon content is0.05%.
