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Forming quality optimization and microstructure analysis of multilayer coatings with laser powder-fed additive manufacturing
参考中译:激光送粉添加剂制造多层涂层成形质量优化及组织分析


          

刊名：Proceedings of the Institution of Mechanical Engineers, Part B. Journal of engineering manufacture
作者：Ning Lv（School of Mechanical Engineering, Liaoning Technical University）
Haitao Yue（School of Mechanical Engineering, Liaoning Technical University）
Chenguang Guo（School of Mechanical Engineering, Liaoning Technical University）
Lijuan Zhao（School of Mechanical Engineering, Liaoning Technical University）
Qiang Li（School of Mechanical Engineering, Liaoning Technical University）
Jianzhuo Zhang（School of Mechanical Engineering, Liaoning Technical University）
Yin Zhang（School of Mechanics and Engineering, Liaoning Technical University）
刊号：780C0002-B
ISSN：0954-4054
出版年：2023
年卷期：2023, vol.237, no.11
页码：1684-1694
总页数：11
分类号：TH16
关键词：Multilayer cladding；response surface method；optimization；forming quality；solidification
参考中译：多层熔覆；响应面法；优化；成形质量；凝固
语种：eng
文摘：To clarify the parameters interaction effects and improve the forming quality of Fe-Cr alloy multilayer laser powder-fed additive manufacturing (LPF-AM) on AISI 4340 substrate, experimental research for Fe-Cr alloy multilayer LPF-AM was carried out via the response surface method (RSM). The interaction effects and evolution rules of laser energy density ( E ), powder feed rate ( Q ), and Z -axis increment ( h ) on minimum cladding height, deposition efficiency and surface spheroidization defects were discussed. The multiobjective particle filter resampling particle swarm optimization (MORPSO) algorithm was adopted to optimize the processing parameters. The phase transformation, grain growth, and microhardness of multilayer LPF-AM were analyzed. The results showed that the powder feed rate and Z -axis increment were found to affect the minimum cladding height and deposition efficiency, respectively. Laser energy density played an essential role in spheroidization defects. The forming quality was significantly improved based on the optimal process parameters of E ?=?33?J/mm~(2), Q ?=?0.5?g/s, and h ?=?0.8?mm. The primary and secondary remelting zones are fine equiaxed dendrites and irregular cellular structures, respectively, and the microstructure of the cladding tracks and layers showed a good metallurgical bonding. The microhardness of the cladding layer ranged from 321?±?18 to 625?±?24 HV_(0.5), and the average microhardness is twice that of the AISI 4340 substrate.
参考中译：为明确Fe-Cr合金多层激光送粉增材制造（LPF-AM）工艺参数间的交互作用，提高AISI 4340基体的成形质量，采用响应面法（RSM）对Fe-Cr合金多层LPF-AM进行了实验研究。讨论了激光能量密度（E）、送粉速率（Q）和Z轴增量（h）对最小熔覆高度、熔敷效率和表面球化缺陷的交互作用及其演化规律。采用多目标粒子滤波剩余粒子群优化算法（MORPSO）对工艺参数进行优化。分析了LPF-AM多层膜的相变、晶粒长大和显微硬度。结果表明，送粉速率和Z轴增量分别影响最小熔覆高度和沉积效率。激光能量密度对球化缺陷的形成起着至关重要的作用。采用最优工艺参数E =？33岁？J/mm~ 2，Q =？0.5？g/s，h？=？0.8？一次重熔区为细小的等轴枝晶，二次重熔区为不规则的胞状组织，熔覆轨迹与熔覆层的显微组织呈良好的冶金结合。熔覆层的显微硬度为321？±？18至625？±？24 HV_（0.5），平均显微硬度是AISI 4340基体的2倍。



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