Single Crystal Castability and Undercoolability of PWA1483 Superalloy  

作　　者：De-Xin Ma Fu Wang Jian-Zheng Guo Wen-Liang Xu 

机构地区：[1]Wedge Central South Research Institute,Shenzhen 518045,China [2]State Key Laboratory for Powder Metallurgy,Central South University,Changsha 410083,China [3]State Key Laboratory for Manufacturing System Engineering,School of Mechanical Engineering,Xi'an Jiaotong University,Xi'an 710049,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2019年第11期1415-1420,共6页金属学报（英文版）

基　　金：financially supported by the Shenzhen Peacock Plan (Grant No. 20150128085205453);the Program for Guangdong Introducing Innovative and Entrepreneurial Teams (Grant No. 607264877417);the National Natural Science Foundation of China (Grant No. 51505457);the National Science and Technology Major Project (Grant No. 2017-Vll-0008);the Key Research and Development Program of Shaanxi Province (Grant No. 2018ZDXMGY-059);the National Science and Technology Major Project (No. 2017ZX04014001)

摘　　要：Both of the single crystal(SX) castability and undercoolability of PWA1383 superalloy were investigated during the directional solidifi cation and isothermal cooling. In all the six SX parts of a casting cluster, no stray grains were found, revealing a defect-free SX structure. This excellent SX castability of the superalloy was attributed to its good undercoolability. The melting point(T_L) and the critical nucleation temperature( T_N) of the alloy were measured to be 1327 °C and 1306 °C, respectively. The statistic average of the critical nucleation undercooling Δ T_N = T_L-T_N of the alloy was determined to be about 21 K, exhibiting a relatively great capacity to be deeply cooled to a temperature below the melting point without the onset of solidifi cation.Both of the single crystal(SX) castability and undercoolability of PWA1383 superalloy were investigated during the directional solidifi cation and isothermal cooling. In all the six SX parts of a casting cluster, no stray grains were found, revealing a defect-free SX structure. This excellent SX castability of the superalloy was attributed to its good undercoolability. The melting point(T_L) and the critical nucleation temperature( T_N) of the alloy were measured to be 1327 °C and 1306 °C, respectively. The statistic average of the critical nucleation undercooling Δ T_N = T_L-T_N of the alloy was determined to be about 21 K, exhibiting a relatively great capacity to be deeply cooled to a temperature below the melting point without the onset of solidifi cation.

关 键 词：SUPERALLOYS CRYSTAL growth Phase TRANSITIONS 

分 类 号：TG1[金属学及工艺—金属学]