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首页> 外文期刊>Rapid prototyping journal >Densification behavior of 316L-NiB stainless steel powder and surface morphology during selective laser melting process using pulsed Nd:YAG laser
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Densification behavior of 316L-NiB stainless steel powder and surface morphology during selective laser melting process using pulsed Nd:YAG laser

机译：316L-NIB不锈钢粉末和表面形态的致密化行为使用脉冲Nd：YAG激光选择激光熔化过程中的选择性激光熔化过程

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Purpose This paper aims to report the production of 316L-1 Wt.% NiB cubes by using the selective laser melting (SLM) process. The laser used was pulsed, millisecond Nd:YAG system with maximum average power 100 W. Design/methodology/approach Densification under different processing conditions (pulse energy, average laser power, laser scan speed, powder layer thickness, pulse frequency) was investigated. Morphology, macro and microstructure of laser melted samples were characterized by digital camera images and by scanning electron microscope. Density of the cubes was determined by Archimedes method in water. Vickers microhardness of samples was determined under the load of 25 g. Corrosion behavior of 316L and 316L-NiB samples was conducted in 5 per cent HCl solution at the testing temperature of 20 degrees C during 240 h. Findings Using laser power of similar to 60-70 W, lower beam overlap and powder layer thickness of 200 mu m, 3D cubical samples were obtained with significant balling in individual layers and an overall porosity being around 30 per cent. By increasing laser power to similar to 80 W, with higher beam overlap and lower powder layer thickness of 100 mu m, SLM parts with no balling and the presence of small pores of up to 4 per cent (20 Hz) and 9 per cent (40 Hz) were obtained. With further increase of laser power to 90 W, overall porosity rose to around 12 per cent. The addition of 1 Wt.% NiB to stainless steel negligibly lowered its corrosion resistance in 5 per cent HCl solution. Originality/value A part from 316L stainless steel with balling-free structure and good density was successfully obtained through pulsed-SLM process with the aid of 1 Wt.% of NiB addition. Aside from significant influence on the improved structure of cubes, NiB had a favorable effect on microhardness values while practically not affecting the corrosion resistivity of the base material in an aggressive surrounding.
机译：目的本文旨在通过使用选择性激光熔化（SLM）工艺报告316L-1重量％。％尖端立方体。使用的激光脉冲，毫秒Nd：YAG系统，具有最大平均功率100 W.在不同加工条件下设计/方法/方法致密化（脉冲能量，平均激光功率，激光扫描速度，粉末层厚度，脉冲频率）。通过数码相机图像和扫描电子显微镜表征激光熔化样品的形态学，宏观和微观结构。立方体的密度由Archimedes方法在水中确定。在25g的负荷下测定样品的Vickers微硬度。在240小时期间在20℃的测试温度下在5％HCl溶液中在5％HCl溶液中进行316L和316L-NIB样品的腐蚀行为。使用激光功率的发现类似于60-70W，较低光束重叠和粉末层厚度为200μm，在各个层中具有显着的球形，并且整体孔隙度约为30％。通过将激光功率增加到类似于80W，具有较高的光束重叠和较低的粉末层厚度为100 mu m，没有弹性的SLM部件，并且存在小孔隙的毛孔，高达4％（20 Hz）和9％（获得了40 Hz。随着激光功率的进一步增加到90 W，整体孔隙度升至约12％。加入1重量％。％尖端到不锈钢疏忽地降低了其5％HCl溶液中的耐腐蚀性。原创性/值通过脉冲-SLM工艺成功地获得了316L不锈钢的一部分，通过脉冲-SLM工艺得到了1重量％的1重量％。除了对立方体的改进结构的显着影响，尖端对微硬度值具有良好的影响，同时实际上不会影响基材在侵略性周围的基础材料的腐蚀电阻率。

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