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首页> 美国卫生研究院文献>Materials >Study on the Numerical Simulation of the SLM Molten Pool Dynamic Behavior of a Nickel-Based Superalloy on the Workpiece Scale
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Study on the Numerical Simulation of the SLM Molten Pool Dynamic Behavior of a Nickel-Based Superalloy on the Workpiece Scale

机译：镍基合金在工件尺度上SLM熔池动态行为的数值模拟研究

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摘要

Nickel-based superalloys are one of the most industrially important families of metallic alloys at present. Selective Laser Melting (SLM), as one of the additive manufacturing technologies for directly forming complex metal parts, has been applied in the production of Inconel 718 components. Based on the more reasonable and comprehensive equivalent processing models (vaporization heat loss, equivalent physical parameters) for the nickel-based superalloy SLM process, an SLM molten pool dynamic behavior prediction model on the workpiece scale was established. Related equivalent processing models were customized by secondary development with the software Fluent. In order to verify the feasibility of the SLM molten pool dynamics model, the SLM single-pass employed to form the Inconel 718 alloy process was calculated. The simulated and experimental solidified track dimensions were in good agreement. Then, the influences of different process parameters (laser power, scanning speed) on the SLM formation of the Inconel 718 alloy were calculated and analyzed. The simulation and experimental solidified track widths were well-matched, and the result showed that, as a rule, the solidified track width increased linearly with the laser power and decreased linearly with the scanning speed. This paper will help lay the foundation for a subsequent numerical simulation study of the thermal-melt-stress evolution process of an SLM workpiece.
机译：镍基高温合金是目前工业上最重要的金属合金家族之一。选择性激光熔化（SLM）作为直接成型复杂金属零件的增材制造技术之一，已应用于Inconel 718组件的生产中。基于镍基高温合金SLM工艺更合理，更全面的等效加工模型（汽化热损失，等效物理参数），建立了针对工件规模的SLM熔池动态行为预测模型。相关等效处理模型是通过使用Fluent软件进行二次开发定制的。为了验证SLM熔池动力学模型的可行性，计算了用于形成Inconel 718合金工艺的SLM单道次。模拟和实验的固化轨道尺寸非常吻合。然后，计算并分析了不同工艺参数（激光功率，扫描速度）对Inconel 718合金SLM形成的影响。模拟和实验的固化轨道宽度非常匹配，结果表明，通常，固化轨道宽度随激光功率线性增加，而随扫描速度线性减少。本文将为后续的SLM工件热熔应力演化过程的数值模拟研究奠定基础。

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