Effect of Cooling Rates on Solidification Microstructures and Tensile Property of a Novel Wrought Superalloy  

作　　者：李鑫旭 JIA Chonglin YU Ang JIANG Zhouhua LI Xinxu;JIA Chonglin;YU Ang;JIANG Zhouhua(Beijing Baimtec Material Co.,Ltd,Beijing,100095,China;Aero Engine Corporation of China,Beijing Institute of Aeronautical Materials,Beijing,100095,China;School of Metallurgy,Northeastern University,Shenyang,110819,China)

机构地区：[1]Beijing Baimtec Material Co.,Ltd,Beijing,100095,China [2]Aero Engine Corporation of China,Beijing Institute of Aeronautical Materials,Beijing,100095,China [3]School of Metallurgy,Northeastern University,Shenyang,110819,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2023年第4期903-910,共8页武汉理工大学学报（材料科学英文版）

摘　　要：The effects of cooling rates on solidification behaviors,segregation characteristics and tensile property of GH4151 alloy were investigated using microstructure characterization and tensile test.Firstly,a relationship between the secondary dendrite arm spacing and cooling rate was determined and it was confirmed to be valid.Secondly,it can be found from microstructure observations that the morphology of(Nb,Ti)C carbides transits from blocky and script type to fine script type and spotty type,and the refinedγ'phase was observed due to decrease of segregation with increasing cooling rates.Thirdly,the solidification microstructures of the industrial-scale samples were analyzed.The morphology ofηphase changes from indistinguishable shape,fine needle-like shape to large block-like shape with increasing ingot diameter.As a result,the mechanical properties of alloy decrease due to increase of brittle precipitations.The experimental results show that the precipitation behavior of GH4151 is affected by segregation degree of elements,and the segregation degree is determined by solute distribution process and solid back-diffusion process.

关 键 词：GH4151 superalloy SOLIDIFICATION SEGREGATION cooling rate tensile properties 

分 类 号：TG132.3[一般工业技术—材料科学与工程]