期刊
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
卷 120, 期 9-10, 页码 5985-5996出版社
SPRINGER LONDON LTD
DOI: 10.1007/s00170-022-09124-0
关键词
Mg-Gd-Y-Zn-Zr alloy; 3D processing maps; Multi-directional forging; Large scale
资金
- National Key Research and Development Program of China [2021YFB3501002]
- National Natural Science Foundation of China [52071208]
The optimal forging parameters for cast Mg-9.0Gd-3.0Y-2.0Zn-0.5Zr alloy were determined using 3D processing maps and finite element analysis, resulting in the production of a large forged part with consistent properties.
The three-dimensional (3D) processing maps of cast Mg-9.0Gd-3.0Y-2.0Zn-0.5Zr alloy were established based on isothermal compression tests and dynamic material model (DMM). The stable and power-efficient forming domains were determined by considering both the instability and power dissipation efficiency maps. Multi-directional forging (MDF) was then simulated by employing finite element (FE) analysis in the Deform-3D software, using the 3D power dissipation efficiency maps as input. The optimal forging parameters were thus obtained for a large-scale ingot with 430 mm in diameter and 440 mm in height, i.e., a forging temperature of 450 degrees C and forging speed of 10 mm/s. Finally, a Mg-9.0Gd-3.0Y-2.0Zn-0.5Zr cake-shaped forged part with 900 mm in diameter and 100 mm in height was produced. After T6-heat treatment, the edge and center of the forged part exhibit homogeneous microstructure and relatively consistent properties, with the tensile strength, yield strength, and elongation being about 400 MPa, 320 MPa, and 14.0%, respectively. Using transmission electron microscopy, the main strengthening phases were revealed to be the dense nano-scale beta ' phases that are uniformly distributed inside the material.
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