Hot deformation characteristics and hot working window of as-cast large-tonnage GH3535 superalloy ingot  

作　　者：Yao Wang Junsong Wang Jiasheng Dong Aimin Li Zhijun Li Guang Xie Langhong Lou 

机构地区：[1]Superalloys Division,Institute of Metal Research,Chinese Academy of Sciences [2]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences [3]College of Materials Science and Chemical Engineering,Harbin Engineering University [4]Technology Center,Fushun Special Steel Shares Co.,LTD. [5]Thorium Molten Salts Reactor Center,Shanghai Institute of Applied Physics,Chinese Academy of Sciences

出　　处：《Journal of Materials Science & Technology》2018年第12期2439-2446,共8页材料科学技术（英文版）

基　　金：supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA02004210)

摘　　要：Deformation characteristics and range of optimized hot working parameters of a 6.5 tons GH3535 superalloy ingot with an average columnar grain size of over 1 mm in diameter were investigated. Axial compression experiments were performed in temperature range of 900-1240 ℃ and strain rate range of 0.001-30 s;at a total strain of 0.8. The hot deformation activation energy of the experimental GH3535 alloy is calculated to be 483.22 kJ/mol. Furthermore, the deformation constitutive equation is established by the peak stresses obtained from the stress-strain curves under various conditions. The hot working window of the alloy ingot at a strain of 0.8 can be preliminarily discussed based on the deformed microstructures and processing maps. The optimized hot working window was thus determined at the strain of 0.95 for 6.5 tons GH3535 alloy ingot by the supplementary compression tests. A large-size GH3535 superalloy ring with a dimension of 03010 mm x 410 mm was ultimately manufactured.Deformation characteristics and range of optimized hot working parameters of a 6.5 tons GH3535 superalloy ingot with an average columnar grain size of over 1 mm in diameter were investigated. Axial compression experiments were performed in temperature range of 900-1240 ℃ and strain rate range of 0.001-30 s^(-1) at a total strain of 0.8. The hot deformation activation energy of the experimental GH3535 alloy is calculated to be 483.22 kJ/mol. Furthermore, the deformation constitutive equation is established by the peak stresses obtained from the stress-strain curves under various conditions. The hot working window of the alloy ingot at a strain of 0.8 can be preliminarily discussed based on the deformed microstructures and processing maps. The optimized hot working window was thus determined at the strain of 0.95 for 6.5 tons GH3535 alloy ingot by the supplementary compression tests. A large-size GH3535 superalloy ring with a dimension of 03010 mm x 410 mm was ultimately manufactured.

关 键 词：Ni-base superalloy Dynamic recrystallization Hot working Large-tonnage ingot Processing map 

分 类 号：TG[金属学及工艺]