Carbon Particle In-Situ Alloying of the Case-Hardening Steel 16MnCr5 in Laser Powder Bed Fusion
Carbon Particle In-Situ Alloying of the Case-Hardening Steel 16MnCr5 in Laser Powder Bed Fusion
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DOI：
10.3390/met11060896
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发表时间：
2021-06-01
期刊：
影响因子：
2.9
通讯作者：
Reinhart, Gunther
中科院分区：
文献类型：
--
作者：
Schmitt, Matthias;Gottwalt, Albin;Reinhart, Gunther
钢的碳含量影响其许多基本性能，如硬度和机械强度。在激光熔化金属粉末床工艺(PBF-LB/M)中，预合金化金属粉末通常是用激光逐层凝固形成零件。在这个过程中，可以观察到钢中碳含量的减少。作为对策，本研究探讨了在PBF-LB/M工艺中向金属粉末中添加碳颗粒和原位合金化。选择了合适的碳粉，分析了碳粉对混合料的粒度分布和均匀性的影响。最后给出了该算法在PBF-LB中的可行性。然后对所产生的机械性能(硬度和机械强度)和在建成状态和热处理后状态下的显微组织进行评估。此外，还讨论了多材料或功能梯度零件等潜在用例。
The carbon content of steel affects many of its essential properties, e.g., hardness and mechanical strength. In the powder bed fusion process of metals using a laser beam (PBF-LB/M), usually, pre-alloyed metal powder is solidified layer-by-layer using a laser beam to create parts. A reduction of the carbon content in steels is observed during this process. This study examines adding carbon particles to the metal powder and in situ alloying in the PBF-LB/M process as a countermeasure. Suitable carbon particles are selected and their effect on the particle size distribution and homogeneity of the mixtures is analysed. The workability in PBF-LB is then shown. This is followed by an evaluation of the resulting mechanical properties (hardness and mechanical strength) and microstructure in the as-built state and the state after heat treatment. Furthermore, potential use cases like multi-material or functionally graded parts are discussed.