3D processing maps of cast Mg-8Gd-3Y alloy at high strain rates and their application in plane strain forging
3D processing maps of cast Mg-8Gd-3Y alloy at high strain rates and their application in plane strain forging
复制标题
铸造Mg-8Gd-3Y合金高应变率3D加工图及其在平面应变锻造中的应用
DOI：
10.1007/s00170-019-04437-z
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发表时间：
2020-01
影响因子：
3.4
通讯作者：
Dong Jie
中科院分区：
文献类型：
--
作者：
Zeng Jian;Wei Xiaoxiao;Dong Shuai;Wang Fenghua;Jin Li;Dong Jie
The stress-strain curves of cast Mg-8Gd-3Y (GW83) alloy at the high strain rates ranging from 0.1 to 1.5 s−1 were obtained by isothermal compression tests. In order to exhibit the hot formability related to material itself, the three-dimensional (3D) processing maps of GW83 alloy were constructed on the basis of hot compression experimental data and dynamic material model (DMM). The 3D processing maps show that the material at high strain rates mostly suffers flow instability, and safety deformation occurs only in a narrow high-temperature domain. The formable processing region is concentrated within the temperature range of 410–440 °C and strain rate range of 0.20–0.73 s−1. By means of user subroutines, the 3D processing maps were integrated into the finite element (FE) software Deform-3D, and the formability of GW83 alloy during the isothermal plane strain forging (PSF) process under four different parameters was predicted. The simulation results indicate that the material possesses good formability under the three parameters of safety region (410 °C/0.4 s−1, 440 °C/0.3 s−1, and 440 °C/0.4 s−1), and flow instability occurs under the parameters of instability region (400 °C/0.8 s−1). Combined with microstructure observation, the accuracy of the simulation results and 3D processing maps was verified via the PSF experiments under the same process parameters as the simulated conditions.
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