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Phase-field simulation of lack-of-fusion defect and grain growth during laser powder bed fusion of Inconel 718

International Journal of Minerals,Metallurgy and Materials 2023年第11期30卷 2224-2235页

作者： Miaomiao Chen Renhai Shi Zhuangzhuang Liu Yinghui Li Qiang Du Yuhong Zhao Jianxin Xie Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory for Advanced Materials Processing(MOE) Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China SINTEF Industry Oslo 0314Norway School of Materials Science and Engineering North University of ChinaTaiyuan 030051China

The anisotropy of the structure and properties caused by the strong epitaxial growth of grains during laser powder bed fusion(L-PBF)significantly affects the mechanical performance of Inconel 718 alloy components such as turbine *** defects(lack-of-fusion Lo F)in components processed via L-PBF are detrimental to the strength of the *** purpose of this study is to investigate the effect of laser scanning parameters on the epitaxial grain growth and LoF formation in order to obtain the parameter space in which the microstructure is refined and LoF defect is *** temperature field of the molten pool and the epitaxial grain growth are simulated using a multiscale model combining the finite element method with the phase-field *** LoF model is proposed to predict the formation of LoF defects resulting from insufficient melting during *** mitigation and grain-structure control during L-PBF can be realized simultaneously in the *** simulation shows the input laser energy density for the as-deposited structure with fine grains and without LoF defects varied from 55.0–62.5 J·mm^(-3)when the interlayer rotation angle was 0°–90°.The optimized process parameters(laser power of 280 W,scanning speed of 1160 mm·s^(-1),and rotation angle of 67°)were computationally *** these conditions,the average grain size was 7.0μm,and the ultimate tensile strength and yield strength at room temperature were(1111±3)MPa and(820±7)MPa,respectively,which is 8.8%and10.5%higher than those of *** results indicating the proposed multiscale computational approach for predicting grain growth and Lo F defects could allow simultaneous grain-structure control and defect mitigation during L-PBF.

关键词： Inconel 718 alloy laser powder bed fusion scanning parameter optimization lack-of-fusion phase-field method finite element method

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