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学者姓名：吴潮潮
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Abstract ：
This study investigated the fabrication of a strengthened Ti-TiO2 material with adding 0.5 wt.% TiO2 nanoparticles via selective laser melting process in comparison with CP-Ti. Through the process parameters optimized by response surface methodology, the Ti-TiO2 material fabricated by SLM showed remarkable tensile strength of 800.6 MPa and elongation of 14%, as compared to the fabricated CP-Ti with tensile strength of 594.0 MPa and elongation of 21%. The x-ray diffraction patterns of fabricated specimens showed the expansion of the hcp-Ti lattice along the c-axis due to dissolved oxygen atoms from the decomposition of TiO2 nanoparticles. The microstructure analysis observed remains of incompletely decomposed TiO2 and TiO phases in SLMed Ti-TiO2 material, which was distinguished from former studies. Consequently, the decomposition behavior of added TiO2 nanoparticles associated with the dissolved oxygen in the Ti-matrix during the SLM process was discussed. Based on the evaluation of both the solution effect of oxygen atoms and the reinforcing effect of undecomposed nanoparticles, the dissolved oxygen from decomposed TiO2 was considered the primary factor in the intensified strength of SLMed Ti-TiO2 material. These results could offer novel insights into the additive manufacturing of high-strength and biocompatible titanium alloy via the SLM process.
Keyword ：
additive manufacturing additive manufacturing biomaterials biomaterials composites composites metallic matrix metallic matrix strengthening mechanism strengthening mechanism titanium titanium
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| GB/T 7714 | Xiang, Hongliang , Chen, Xiaoyu , Huang, Ye et al. Decomposition Behavior and Strengthening Mechanism of Ti-TiO2 Material in Selective Laser Melting Process [J]. | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2025 . |
| MLA | Xiang, Hongliang et al. "Decomposition Behavior and Strengthening Mechanism of Ti-TiO2 Material in Selective Laser Melting Process" . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE (2025) . |
| APA | Xiang, Hongliang , Chen, Xiaoyu , Huang, Ye , Wu, Chaochao , Mou, Gang , Zheng, Kaikui . Decomposition Behavior and Strengthening Mechanism of Ti-TiO2 Material in Selective Laser Melting Process . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2025 . |
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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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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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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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Objective Laser powder bed fusion (LPBF) additive manufacturing technology has been widely utilized to fabricate degradable zinc (Zn) implants and is a novel approach for creating complex structures with controllable shape and exceptional performance. However, printing Zn is challenging owing to its evaporative nature and narrow fabricating window arising from its low melting and boiling points. Therefore, a comprehensive investigation must be conducted to reveal the mechanisms of heat and mass transfer in molten pool during LPBF, which can provide theoretical guidance for the optimization of printing-process parameters. Methods A mesoscopic-scale heat transfer and flow coupling model of molten pool during the LPBF of pure Zn was established using discrete-element and computational fluid dynamics methods. Single molten-track experiments were designed to verify the numerical model. The mechanisms by which the process parameters affect the temperature field, flow field evolution, and morphology of the molten track were discussed. Results and Discussions Pure Zn is sensitive to changes in transient heat input owing to its low melting and boiling points. Increasing the laser power significantly alters the molten-track size, peak temperature, and cooling rate. Specifically, when the laser power is increased from 30 W to 60 W and 90 W, the real-time volume of the molten pool increases nonlinearly by 510% and 1730%, respectively (Fig. 9). At higher scanning rates, more laser energy is absorbed by the surface of Zn powder, the length-width ratio of the molten pool changes gradually from 1.28 to 1.98, and the length-depth ratio changes from 1.61 to 3.45 (Figs. 4 and 5). Consequently, the molten pool is longer, shallower, and more narrow, thus resulting in larger temperature gradients along the direction of the molten-pool depth, with the maximum cooling rate increasing from 3.6×106 K·s-1 to 1.3×107 K·s-1 (Figs. 6 and 7). Furthermore, the real-time volume fluctuated considerably and erratically during molten-track formation. As the laser energy density within the molten pool increases further, the internal flow accelerates and the evaporation of Zn at the center becomes evident, thus changing the Marangoni convection caused by temperature gradient into evaporative recoil pressure as the dominant driving force for flow within the molten pool. The morphology of the printed molten tracks transformed from central point-like pits into continuous slitlike shapes (Fig. 11). The findings of this study can provide theoretical guidance for the evolution of the molten pool and for optimizing the LPBF processing of metals with low melting and boiling points. Conclusions (1) Significant evaporation is observed under high laser power during the LPBF printing of pure Zn, whereas the molten tracks indicate low stability at high scanning rates. Under laser power levels and laser scanning rates of 45‒60 W and 300‒600 mm·s-1, respectively, the simulation results indicate strong metallurgical bonding between Zn powders and Zn substrate, thus implying the high stability of the molten tracks. (2) The stability of the printing process is affected significantly by the process parameters owing to the low melting and boiling points of Zn. Therefore, LPBF machines equipped with the appropriate gas flow field can prevent Zn vapor from destroying laser propagation. (3) When a laser source with Gaussian-distribution characteristics is used, the temperature in the central region of the molten pool exceeds the boiling point, even when a laser power as low as 30 W is used, which is not conducive to the stable formation of Zn. Laser-beam shaping or positive defocusing can be considered to weaken the high energy density in the central region of the laser to reduce evaporation, thus ultimately improving the forming quality of LPBF-printed Zn. © 2024 Science Press. All rights reserved.
Keyword ：
additive manufacturing additive manufacturing flow coupling flow coupling heat transfer heat transfer laser powder bed fusion laser powder bed fusion numerical simulation numerical simulation pure zinc pure zinc
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| GB/T 7714 | Han, C. , Yuan, D. , Dong, Z. et al. Heat Transfer and Flow Mechanisms in Mesoscale Molten Pool of Pure Zinc Fabricated via Laser Powder Bed Fusion (Invited); [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]. | Chinese Journal of Lasers , 2024 , 51 (20) . |
| MLA | Han, C. et al. "Heat Transfer and Flow Mechanisms in Mesoscale Molten Pool of Pure Zinc Fabricated via Laser Powder Bed Fusion (Invited); [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）]" . | Chinese Journal of Lasers 51 . 20 (2024) . |
| APA | Han, C. , Yuan, D. , Dong, Z. , Huang, J. , Wu, C. , Wu, J. et al. Heat Transfer and Flow Mechanisms in Mesoscale Molten Pool of Pure Zinc Fabricated via Laser Powder Bed Fusion (Invited); [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）] . | Chinese Journal of Lasers , 2024 , 51 (20) . |
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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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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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