建筑环境氧浓度及马氏体时效钢氧化程度对粉末床熔焊飞溅行为的影响

M. Yamaguchi, Kotaro Tsubouchi, Asako Kamimoto, Shinnosuke Yamada, Kenji Sugiyama, T. Furumoto
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引用次数: 1

摘要

研究了建筑环境中的氧浓度和马氏体时效钢粉的氧化程度对粉末床熔合过程中飞溅产生行为的影响。在不同的热处理温度下对粉末进行氧化处理,并用俄歇能谱对其氧化程度进行评价。然后研究了粉末在建筑大气中氧气浓度为1.0×102 ppm(纯度为99.99%)~ 5.0×104 ppm(纯度为95%)时的飞溅行为。结果表明:建筑环境中氧气的存在比氧化膜对马氏体时效钢粉溅射产生的影响更大。氧浓度对溅射粒子的速度和角度有影响。当氧气浓度为5.0×104 ppm时,飞溅颗粒的数量是1.0×102 ppm时的2.5倍。较高的氧浓度会导致附着在飞溅表面的烟雾颗粒数量增加,从而降低其可重复使用性。粉末表面的氧化膜对蒸汽喷射行为没有显著影响,但改变了粉末的流动性,影响了飞溅的产生。为了减少飞溅的产生,获得高质量的飞溅表面,建议建筑环境中的氧气浓度保持在1.0×102 ppm。
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Influence of Oxygen Concentration in Building Environment and Oxidation Extent of Maraging Steel on Spatter Generation Behavior in Powder Bed Fusion
This study investigated the influence of oxygen concentration in the building environment and the degree of oxidation of maraging steel powder on spatter generation behavior during powder bed fusion (PBF) process. The powders were oxidized at various heat treatment temperatures, and their degree of oxidation was evaluated using Auger electron spectroscopy. The spatter generation behavior of the powders at oxygen concentrations of 1.0×102 ppm (99.99% purity) to 5.0×104 ppm (95% purity) in the building atmosphere was then investigated. The results indicated that the presence of oxygen in the building environment had a greater effect on spatter generation than the oxide film on the maraging steel powder. The oxygen concentration affected the velocity and angle of spatter particles. At an oxygen concentration of 5.0×104 ppm, the number of spatter particles was 2.5 times greater than that of 1.0×102 ppm. A higher oxygen concentration resulted in an increase in the number of fume particles adhering to the spatter surface, reducing its reusability. The oxide film on the powder did not significantly affect the vapor jet behavior, but it altered the powder’s flowability, impacting the spatter generation. To decrease spatter generation and obtain a high-quality spatter surface, it is recommended that the oxygen concentration in the building environment should be maintained at 1.0×102 ppm.
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