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Lingzhi Wu, Cong Zhang, Dil Faraz Khan, Ruijie Zhang, Yongwei Wang, Xue Jiang, Haiqing Yin, Xuanhui Qu, Geng Liu, and Jie Su, Unveiling the cellular microstructure–property relations in martensitic stainless steel via laser powder bed fusion, Int. J. Miner. Metall. Mater., 31(2024), No. 11, pp.2476-2487. https://dx.doi.org/10.1007/s12613-024-2947-z
Lingzhi Wu, Cong Zhang, Dil Faraz Khan, Ruijie Zhang, Yongwei Wang, Xue Jiang, Haiqing Yin, Xuanhui Qu, Geng Liu, and Jie Su, Unveiling the cellular microstructure–property relations in martensitic stainless steel via laser powder bed fusion, Int. J. Miner. Metall. Mater., 31(2024), No. 11, pp.2476-2487. https://dx.doi.org/10.1007/s12613-024-2947-z
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通过激光粉床熔化揭示马氏体时效钢微观胞状结构与性能关系

摘要: 增材制造作为一种具有较大设计自由度的快速制造技术,通过逐层成形实现复杂零部件的快速制造。目前文献关于选区激光熔化过程中激光扫描速度对胞状组织及力学性能的研究鲜有报道,因此本文系统地研究了激光粉末床熔化的主要工艺参数之一—激光扫描速度对马氏体不锈钢显微组织及室温拉伸的影响。实验表明通过改变激光扫描速度,试样的微观组织和力学性能发生了明显的变化。当激光扫描速度从400 mm/s增大到1000 mm/s时,相分数无明显变化,平均胞状晶粒尺寸从0.60 μm 减少到0.35 μm,随着扫描速度的增加,力学性能先增加后降低,过高的扫描速度(≥1000 mm/s)和过低的扫描速度(≤400 mm/s)均对性能不利,分别会导致缺乏熔合和匙孔缺陷,最优的扫描速度为800 mm/s制备的样品室温拉伸强度和延伸率最高,抗拉强度为(1088.3±2.0) MPa,延伸率为(16.76±0.1)%。阐明了表面形态、缺陷和能量输入的演变机制,并建立了胞状组织结构与机械性能之间的关系。

 

Unveiling the cellular microstructure–property relations in martensitic stainless steel via laser powder bed fusion

Abstract: Laser powder bed fusion (LPBF) is a widely recognized additive manufacturing technology that can fabricate complex components rapidly through layer-by-layer formation. However, there is a paucity of research on the effect of laser scanning speed on the cellular microstructure and mechanical properties of martensitic stainless steel. This study systematically investigated the influence of laser scanning speed on the cellular microstructure and mechanical properties of a developed Fe11Cr8Ni5Co3Mo martensitic stainless steel produced by LPBF. The results show that increasing the laser scanning speed from 400 to 1000 mm/s does not lead to a noticeable change in the phase fraction, but it reduces the average size of the cellular microstructure from 0.60 to 0.35 μm. The scanning speeds of 400 and 1000 mm/s both had adverse effects on performances of sample, resulting in inadequate fusion and keyhole defects respectively. The optimal scanning speed for fabricating samples was determined to be 800 mm/s, which obtained the highest room temperature tensile strength and elongation, with the ultimate tensile strength measured at (1088.3 ± 2.0) MPa and the elongation of (16.76 ± 0.10)%. Furthermore, the mechanism of the evolution of surface morphology, defects, and energy input were clarified, and the relationship between cellular microstructure size and mechanical properties was also established.

 

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