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学者姓名：吴潮潮
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Abstract ：
基于离散元方法和计算流体力学,建立了介观尺度下激光粉末床熔融(LPBF)成形纯锌熔池传热流动耦合模型,重点讨论了工艺参数对熔池温度场、流场演变以及熔道形貌的影响机制.研究结果表明:在LPBF成形过程中,低熔点低沸点的纯锌对瞬时热输入的变化非常敏感,随着激光功率增大,熔道成形尺寸、峰值温度、冷却速率均显著增加;当激光功率由30 W分别提高到60 W和90 W时,熔池的实时体积分别增长了 510％和1730％;扫描速率的提高导致激光能量更多地被表层锌粉吸收,熔池的长宽比逐渐由1.28变为1.98,长深比由1.61变为3.45,熔池形态呈现长、浅、窄特征;熔深方向的温度梯度变大,最大冷却速率由3.6×106 K·s-1提高到1.3×107 K·s-1;在高扫描速率下,实时熔池体积波动大,熔道成形具有不稳定性;随着激光能量密度增加,熔池内部流动不断加剧,激光中心区域的纯锌蒸发现象变得更加明显,熔池流动的主导驱动力逐渐由温度梯度引起的Marangoni对流转变为蒸发致反冲压力,熔道形貌逐渐由中心点状凹坑发展为连续的裂隙状.本研究结果可为LPBF成形过程中低熔点低沸点金属熔池演变研究与工艺优化提供理论指导.
Keyword ：
传热流动耦合 传热流动耦合 增材制造 增材制造 数值模拟 数值模拟 激光粉末床熔融 激光粉末床熔融 纯锌 纯锌
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| GB/T 7714 | 韩昌骏 , 袁道林 , 董志 et al. 激光粉末床熔融成形纯锌介观尺度熔池传热与流动机理研究(特邀) [J]. | 中国激光 , 2024 , 51 (20) : 152-162 . |
| MLA | 韩昌骏 et al. "激光粉末床熔融成形纯锌介观尺度熔池传热与流动机理研究(特邀)" . | 中国激光 51 . 20 (2024) : 152-162 . |
| APA | 韩昌骏 , 袁道林 , 董志 , 黄金淼 , 吴潮潮 , 吴家柱 et al. 激光粉末床熔融成形纯锌介观尺度熔池传热与流动机理研究(特邀) . | 中国激光 , 2024 , 51 (20) , 152-162 . |
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Abstract ：
The supportfree printing of overhanging structure arouses enormous interest for its advantages to eliminate the need for support removal and to improve the efficiency in laser powder bed fusion (L-PBF) additive manufacturing. However, the improvement of down -facing surface quality remains a significant challenge, where an in-depth understanding of the formation of overhanging tracks is essential. This paper developed a multiphysics model of overhanging tracks in L-PBF to systematically investigate the formation mechanisms of key features such as discontinuity and dross, as well as their correlation with surface roughness. It reveals that there are two main causes of discontinuity of overhanging tracks: the coalescence and balling of the melt under low energy density, and the irregular sinking of melt pool at the overhanging edge. The high energy density could mitigate the occurrence of discontinuous tracks, but it might also lead to undesirable dross upon the complete penetration of the overhanging structure. The relationship between processing parameters, morphological defects and surface roughness were systematically discussed, which revealed the necessity to tailor processing parameters for different overhang angles to improve the down -facing surface quality. Furthermore, the significant correlation between the single-track morphology and the down -facing surface roughness has been demonstrated quantitatively, which proposed a practical way to predict the trend of the down -facing surface quality by single-track simulation. This could help improve the supportfree printing process in metal additive manufacturing.
Keyword ：
Laser powder bed fusion Laser powder bed fusion Multi-physics modeling Multi-physics modeling Overhanging structure Overhanging structure Supportfree printing Supportfree printing Surface roughness Surface roughness
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| GB/T 7714 | Xiang, Hongliang , Zhou, Yulong , Zhang, Xiangkai et al. Supportfree printing in laser powder bed fusion: Formation mechanisms of discontinuity, dross and surface roughness [J]. | OPTICS AND LASER TECHNOLOGY , 2024 , 177 . |
| MLA | Xiang, Hongliang et al. "Supportfree printing in laser powder bed fusion: Formation mechanisms of discontinuity, dross and surface roughness" . | OPTICS AND LASER TECHNOLOGY 177 (2024) . |
| APA | Xiang, Hongliang , Zhou, Yulong , Zhang, Xiangkai , Li, Jie , Huang, Ye , Mou, Gang et al. Supportfree printing in laser powder bed fusion: Formation mechanisms of discontinuity, dross and surface roughness . | OPTICS AND LASER TECHNOLOGY , 2024 , 177 . |
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Laser powder bed fusion (LPBF) of duplex stainless steel is a promising route to fabricate intricate parts with excellent mechanical properties. However, further understanding of build mechanisms is required to improve the process. This paper aims to better understand the influence of hatch distance on the densification behavior and figure out the correlation with microstructure and mechanical properties in LPBF of 2205 stainless steel. With the optimized laser power and scanning speed, the significant influence of hatch distance on the build quality is revealed. A hatch distance of 0.07 mm is selected for an even surface and dense part with a relative density of up to 99.13 %. The hatch distance has a crucial impact on the heat and mass transfer between tracks; hence, poor surface morphologies such as inter-track voids or swelling surfaces occur if an improper hatch distance is adopted. The optimal mechanical properties are also achieved. Specifically, the yield strength (0.2 YS), ultimate tensile strength (UTS), and elongation (EL) values are 896.8 MPa, 1035.13 MPa, and 15.34 %, respectively. The improvement in mechanical properties can be ascribed to the coordination between high dislocation density, fine grain size, high CSL boundaries and LAGBs, and high relative density with few pores. This work can help improve the build quality and expand the application horizon of duplex stainless steel for manufacturing intricate components.
Keyword ：
Duplex stainless steel Duplex stainless steel Laser powder bed fusion Laser powder bed fusion Mechanical properties Mechanical properties Microstructure Microstructure Relative density Relative density Surface morphology Surface morphology
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| GB/T 7714 | Zhao, Wei , Xiang, Hongliang , Wu, Chaochao et al. Tuning hatch distance to optimize microstructure and mechanical properties of 2205 duplex stainless steel produced by laser powder bed fusion [J]. | OPTICS AND LASER TECHNOLOGY , 2024 , 172 . |
| MLA | Zhao, Wei et al. "Tuning hatch distance to optimize microstructure and mechanical properties of 2205 duplex stainless steel produced by laser powder bed fusion" . | OPTICS AND LASER TECHNOLOGY 172 (2024) . |
| APA | Zhao, Wei , Xiang, Hongliang , Wu, Chaochao , Huangfu, Chengyang , Lu, Yanjin . Tuning hatch distance to optimize microstructure and mechanical properties of 2205 duplex stainless steel produced by laser powder bed fusion . | OPTICS AND LASER TECHNOLOGY , 2024 , 172 . |
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Electron beam powder bed fusion (EB-PBF) is a key metal additive manufacturing (AM) technology known for its high energy absorption and low heat stress. However, the high surface roughness of EB-PBF parts has limited its broader application. To address this issue, this paper proposes a dashed-scan contouring strategy to obtain lower surface roughness in EB-PBF. This strategy involves melting the contour in the form of segmented staggered scans and employing high-frequency jumping of the electron beam (EB) to melt multiple positions synchronously. A comprehensive analysis, combining experimental investigations and multi-physical simulations, elucidates the intrinsic connection between control processes and melt pool stability. Results show that by controlling the length-to-width ratio of the melt pool, regulating overlap distances between melt pools, and fine-tuning cooling times, balling phenomena and Plateau-Rayleigh instabilities can be suppressed. Additionally, these measures effectively mitigate irregularities in track formation when compared to the traditional process. Experimental validation demonstrates the efficacy of the approach, achieving reduced surface roughness (Ra) of thin-walled Ti6Al-4 V parts from over 25 mu m to below 12.6 mu m, while enhancing dimensional accuracy and reducing melt anomalies at corners. The proposed dashed-scan contouring strategy opens new avenues for AM of highly reliable and intricate structures, such as lattice sandwich structures, thin walls, and internal flow passages.
Keyword ：
Contouring strategy Contouring strategy Electron beam melting Electron beam melting Melt pool Melt pool Multi-physical simulation Multi-physical simulation Powder bed fusion Powder bed fusion Surface quality Surface quality
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| GB/T 7714 | Wang, Feihong , Wu, Chaochao , Liang, Yongfeng et al. A surface quality optimization strategy based on a dedicated melt-pool control via the dashed-scan contouring technique in electron beam powder bed fusion [J]. | JOURNAL OF MATERIALS PROCESSING TECHNOLOGY , 2024 , 330 . |
| MLA | Wang, Feihong et al. "A surface quality optimization strategy based on a dedicated melt-pool control via the dashed-scan contouring technique in electron beam powder bed fusion" . | JOURNAL OF MATERIALS PROCESSING TECHNOLOGY 330 (2024) . |
| APA | Wang, Feihong , Wu, Chaochao , Liang, Yongfeng , Liang, Xiaoyu , Wu, Honghui , Liu, Li et al. A surface quality optimization strategy based on a dedicated melt-pool control via the dashed-scan contouring technique in electron beam powder bed fusion . | JOURNAL OF MATERIALS PROCESSING TECHNOLOGY , 2024 , 330 . |
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Duplex stainless steels (DSSs) produced via laser powder bed fusion (LPBF) exhibit excellent strength and plasticity compatibility. In this study, in -situ electron backscatter diffraction (EBSD) was employed to investigate the coordinated deformation behavior of 2205 DSSs fabricated by LPBF with heat treatment at 1050 degrees C for 1 h, including strain distribution behavior and mechanism of stress concentration release. The results indicate that the initial deformation of LPBF samples is primarily concentrated in the austenite phase. As the tension progresses, austenite gradually transitioned to hard orientation, and the strain in austenite can pass through the phase boundary into the ferrite grain. To coordinate the deformation, ferrite transitioned to soft orientation through rotation towards the slip systems of {110}<- 111> and {1-21}<111>. The stress concentration in ferrite can be alleviated by forming dislocation walls and cells through planar and cross-slip dislocations. In contrast, the stress concentration in austenite can be released by stacking faults and deformation twins. Compared to the as -cast samples, the yield strength of LPBF samples is improved from 472 +/- 13 to 641 +/- 17 MPa due to fine grain strengthening and dislocation strengthening. This study offers guidance for further enhancing the strength and plasticity of materials prepared by LPBF.
Keyword ：
Deformation behavior Deformation behavior Duplex stainless steel Duplex stainless steel Laser powder bed fusion Laser powder bed fusion Microstructure evolution Microstructure evolution
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| GB/T 7714 | Zhao, Wei , Xiang, Hongliang , Zhan, Xianming et al. In-situ EBSD study of the coordinated deformation behavior of 2205 duplex stainless steel fabricated via laser powder bed fusion during the tensile process [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2024 , 901 . |
| MLA | Zhao, Wei et al. "In-situ EBSD study of the coordinated deformation behavior of 2205 duplex stainless steel fabricated via laser powder bed fusion during the tensile process" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 901 (2024) . |
| APA | Zhao, Wei , Xiang, Hongliang , Zhan, Xianming , Zhang, Xiangkai , Wu, Chaochao . In-situ EBSD study of the coordinated deformation behavior of 2205 duplex stainless steel fabricated via laser powder bed fusion during the tensile process . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2024 , 901 . |
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