Increasing numbers of critical components for the aerospace and power industries are fabricated using additive manufacturing (AM). To increase the productivity of high‐temperature components by AM, the scanning speed needs to be maximized without sacrificing the required creep properties. In this study, five rectangular blocks were manufactured using selective laser melting while varying the scanning speed from 420 to 980 mm/s. Small punch creep tests were conducted at 650°C using 10 × 10 × 0.5 mm specimens machined from each block. Creep deformation and rupture life were measured. Power law creep constants were also determined. Difference of creep behaviours were explained based on the microstructures showing pore defects and the measured metal density values. A 3D response surface plot was employed to predict the creep life as a function of the scanning speed and the energy density. As a consequence, a scanning speed range of 416 to 572 mm/s is recommended to maximize productivity and to increase creep resistance.

中文翻译：

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扫描速度对选择性激光熔炼生产的316L不锈钢蠕变行为的影响

使用增材制造（AM）制造了越来越多的航空航天和电力行业的关键组件。为了通过AM提高高温组件的生产率，需要在不牺牲所需蠕变特性的情况下最大化扫描速度。在这项研究中，使用选择性激光熔化技术制造了五个矩形块，同时将扫描速度从420毫米/秒改变为980毫米/秒。小冲头蠕变试验是在650°C下进行的，每个试块加工了10×10×0.5 mm的试样。测量蠕变变形和断裂寿命。还确定了幂律蠕变常数。根据显示孔隙缺陷的微观结构和测得的金属密度值解释了蠕变行为的差异。使用3D响应表面图来预测蠕变寿命，该蠕变寿命是扫描速度和能量密度的函数。因此，建议使用416至572 mm / s的扫描速度范围，以最大化生产率并提高抗蠕变性。