Directed energy deposition of 18NiM300 steel: effect of process and post processing conditions on microstructure and properties.

IF 7.4 3区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Science and Technology of Advanced Materials Pub Date : 2024-04-26 eCollection Date: 2024-01-01 DOI:10.1080/14686996.2024.2346071

Stefano Felicioni, Alberta Aversa, Erica Librera, Federica Bondioli, Paolo Fino

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Abstract

This current study investigates the effect of Direct Energy Deposition (DED) process conditions on the properties and microstructure of M300 maraging steel samples. The investigation centers on two key factors: laser power and deposition environment. The microstructure of this tool steel is analyzed by computing the Primary Cellular Arm Spacing. The findings revealed a significant influence of both inert atmosphere and laser power on cooling conditions. These different cooling rates influence the phase content as demonstrated by X-Ray Diffraction and Electron Backscatter Diffraction measurements. It was demonstrated the presence of different content of residual austenite at cell boundaries. These distinct microstructural features caused variations in the hardness values of the printed samples. Furthermore, a direct aging heat treatment was implemented, that was chosen from Differential Scanning Calorimetry measurements results. This heat treatment proves effective in achieving consistent hardness increases and eliminated the differences among samples built in different process conditions. This outcome suggests the possibility of selecting the most economically viable DED parameters for optimal results.

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18NiM300 钢的定向能沉积：工艺和后处理条件对微观结构和性能的影响

本研究调查了直接能量沉积（DED）工艺条件对 M300 马氏体时效钢样品性能和微观结构的影响。研究集中于两个关键因素：激光功率和沉积环境。通过计算主胞臂间距分析了这种工具钢的微观结构。研究结果表明，惰性气氛和激光功率对冷却条件有显著影响。X 射线衍射和电子反向散射衍射测量结果表明，不同的冷却速度会影响相的含量。结果表明，在晶胞边界存在不同含量的残余奥氏体。这些不同的微观结构特征导致了印刷样品硬度值的变化。此外，还根据差示扫描量热仪的测量结果选择了一种直接老化热处理方法。事实证明，这种热处理能有效实现硬度的一致提高，并消除了在不同工艺条件下制作的样品之间的差异。这一结果表明，可以选择最经济可行的 DED 参数，以获得最佳效果。

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来源期刊

Science and Technology of Advanced Materials 工程技术-材料科学：综合

CiteScore

10.60

自引率

3.60%

发文量

审稿时长

4.8 months

期刊介绍： Science and Technology of Advanced Materials (STAM) is a leading open access, international journal for outstanding research articles across all aspects of materials science. Our audience is the international community across the disciplines of materials science, physics, chemistry, biology as well as engineering. The journal covers a broad spectrum of topics including functional and structural materials, synthesis and processing, theoretical analyses, characterization and properties of materials. Emphasis is placed on the interdisciplinary nature of materials science and issues at the forefront of the field, such as energy and environmental issues, as well as medical and bioengineering applications. Of particular interest are research papers on the following topics: Materials informatics and materials genomics Materials for 3D printing and additive manufacturing Nanostructured/nanoscale materials and nanodevices Bio-inspired, biomedical, and biological materials; nanomedicine, and novel technologies for clinical and medical applications Materials for energy and environment, next-generation photovoltaics, and green technologies Advanced structural materials, materials for extreme conditions.