Donghan Fan, Naicheng Sheng, Kuo Jiang, Jie Meng, Guichen Hou, Jinguo Li, Yizhou Zhou, Xiaofeng Sun
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Effect of wall thickness on residual stress and microstructural evolution in multi-blade casting technique
The multi-blade casting technique used in fabricating blades by the superalloy K418B was investigated, which is more efficient and cost-saving in comparison with the traditional polycrystalline superalloy casting technique. In this work, the differences in microstructures and mechanical properties were analyzed by adjusting different thicknesses of the blades. The results of experimental studies and numerical simulations showed that the size of the γ' phase and the stress rupture property were positively correlated with the thickness of the blades and that the cooling rate and the residual stress were negatively correlated with it. Additionally, the residual stress decreased from 200 to 50 MPa as the thickness of the blades increased which followed the same trends as the geometrically necessary dislocation (GND) density. This study provides guidance in the optimization of microstructure in multi-blade casting technology.
期刊介绍：
The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.
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