Hot deformation characteristics and hot working window of as-cast large-tonnage GH3535 superalloy ingot
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2018年第12期
论文作者：Yao Wang Junsong Wang Jiasheng Dong Aimin Li Zhijun Li Guang Xie Langhong Lou
文章页码：2439 - 2446
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-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.
Yao Wang1,2，Junsong Wang3，Jiasheng Dong1，Aimin Li4，Zhijun Li5，Guang Xie1,2，Langhong Lou1
1. Superalloys Division,Institute of Metal Research,Chinese Academy of Sciences2. Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences3. College of Materials Science and Chemical Engineering,Harbin Engineering University4. Technology Center,Fushun Special Steel Shares Co.,LTD.5. Thorium Molten Salts Reactor Center,Shanghai Institute of Applied Physics,Chinese Academy of Sciences
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-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.
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