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利用COAXquattro多丝DED-LB喷嘴原位合金化实现高通量合金筛选
High-Throughput Alloy Screening by Means of In Situ Alloying with Multi-wire DED-LB Nozzle COAXquattro
Journal of Thermal Spray Technology
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Springer Science+Business Media
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多丝激光熔覆高通量选合金，参数缺失难复现
AI理解
要点 用COAXquattro同轴多丝激光熔覆头将316L与IN625丝原位混合并添加Mo/Ti/Al粉，高通量制备复杂成分合金；NiFeCr基熔覆道呈FCC基体含铌偏析，相结构与CALPHAD计算一致，耐蚀性优于316L。
能不能用 DED-LB属激光熔覆工艺，与热喷涂同属表面/材料工程可关注方向。需要同轴多丝激光熔覆设备（COAXquattro类）与送丝送粉系统。摘要未给激光功率、扫描速度、送丝速率等关键工艺参数，无法直接复现；论文目的是高通量合金筛选而非涂层制备，对热喷涂产线属思路参考，不能直接照搬。
存疑
- 缺工艺：激光功率、扫描速度、送丝/送粉速率等参数摘要未给
- 评价单一：仅用动电位极化对比耐蚀性，力学与磨损性能数据有限
中文摘要
通过激光定向能量沉积（DED-LB）进行原位合金化是一项创新技术，能够在增材制造过程中直接设计具有定制性能的复杂金属合金。Fraunhofer IWS开发的同轴高功率多丝激光熔覆头COAXquattro能够在沉积过程中利用多种丝材与粉末组合实现原位合金化。本工作通过以不同比例原位混合市售316L不锈钢与Inconel 625（IN625）丝材，制备了新型复杂成分合金。添加少量钼、钛、铝粉末以增强所设计合金的耐蚀性与力学强度。原位合金化的NiFeCr基激光熔覆道呈现出面心立方基体微观组织并伴随铌偏析。将试样的相结构与使用Thermo-Calc软件基于TCFE13和TCNI12数据库进行的初步CALPHAD计算结果进行了比较，计算与实验结果吻合良好。动电位极化测试表明，原位生成合金的耐蚀性能优于316L不锈钢。
查看英文摘要
Abstract In situ alloying through laser direct energy deposition (DED-LB) is an innovative technique that enables the design of complex metal alloys with tailored properties directly during the additive manufacturing process. The coaxial high-power multi-wire laser cladding head COAXquattro developed at Fraunhofer IWS enables in situ alloying from a variety of wire and powder combinations during the deposition process. In this work, novel compositionally complex alloys were produced by in situ mixing of commercially available stainless steel 316L and Inconel 625 (IN625) wires at different ratios. Additions of small amounts of molybdenum, titanium, and aluminum powders were used to enhance the corrosion resistance and mechanical strength of designed alloys. In situ alloyed NiFeCr-based laser tracks exhibited a microstructure with face-centered cubic matrix and segregations of niobium. The phase structure of the specimens has been compared to the results of preliminary CALPHAD calculations executed with Thermo-Calc software using TCFE13 and TCNI12 databases, showing a good agreement between calculations and experimental results. Potentiodynamic polarization tests revealed better corrosion resistance performance of in situ generated alloys compared to 316L stainless steel.
原文依据
查看原文依据
- In situ alloying through laser direct energy deposition (DED-LB) is an innovative technique that enables the design of complex metal alloys with tailored properties directly during the additive manufacturing process.
- In situ alloyed NiFeCr-based laser tracks exhibited a microstructure with face-centered cubic matrix and segregations of niobium.
- Potentiodynamic polarization tests revealed better corrosion resistance performance of in situ generated alloys compared to 316L stainless steel.