Selective laser melting (SLM) is a new 3D printing technology capable of directly manufacturing metal end products and near-end products. Currently, the processing of Ni-based alloy powders by SLM technology have not been reported yet. For this consideration, this paper lays the foundation for developing relevant SLM technology by experimenting with GH4169 Ni-based alloy powders using an LWY400P laser. The paper dealt primarily with single-layer, single-path and single-layer, multi-path scan processes in order to explore the mechanisms of the effects of laser process parameters (e.g. current, frequency, pulse width, scan speed and scan spacing) on the formability of GH4169 Ni-based alloy powders. Process optimization was carried out as well. The optimized SLM process involved a parameter group comprising a 140 A laser current, a 150 mm/min scan speed, a 0.35 mm scan spacing, a 5.5 ms pulse width, a 12 Hz frequency and a 0.15 mm coating thickness. Under the optimized parameter group, a 427 HV microhardness was observed. Meanwhile, the formed products had a basically flat surface, uniform microstructure, and high density.

中文翻译：

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选择性激光熔化GH4169镍基合金粉末的成形性和硬度研究

选择性激光熔化（SLM）是一种新的3D打印技术，能够直接制造金属最终产品和近端产品。目前，尚未报道通过SLM技术处理Ni基合金粉末。为此，本文通过使用LWY400P激光器对GH4169镍基合金粉末进行试验，为开发相关的SLM技术奠定了基础。本文主要涉及单层，单路径和单层，多路径扫描过程，以探讨激光过程参数（例如电流，频率，脉冲宽度，扫描速度和扫描间隔）影响的机制。 GH4169镍基合金粉末的成形性 还进行了工艺优化。优化的SLM工艺涉及一个包含140 A激光电流的参数组，扫描速度为150毫米/分钟，扫描间距为0.35毫米，脉冲宽度为5.5毫秒，频率为12 Hz，涂层厚度为0.15毫米。在优化的参数组下，观察到427 HV显微硬度。同时，形成的产品具有基本平坦的表面，均匀的微观结构和高密度。