Optimization and analysis of surface milling parameters of additive manufacturing maraging steel

YANG Zeyu; LI Weimin; ZHANG Yanpeng; SONG Minglin; GAO Qi

doi:10.13228/j.boyuan.issn0449-749x.20240091

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Iron and Steel ›› 2024, Vol. 59 ›› Issue (6) : 135-144. DOI: 10.13228/j.boyuan.issn0449-749x.20240091

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Optimization and analysis of surface milling parameters of additive manufacturing maraging steel

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Abstract

Maraging steels are well known for their high strength and toughness, as well as good molding properties, and are well suited to meet the requirements of additive manufacturing production. However, the poor surface quality of the materials used in its manufacture has constrained its rapid development. And there are few existing studies related to the post-treatment of maraging steel surface additive manufacturing materials. Therefore, in this paper, cladding layers with different lap spacing were fabricated by laser cladding. and the cladding layers with a lap spacing of 0.7 mm was selected for surface milling orthogonal experiments with flatness as the index. The surface roughness of the milled cladding layer and its morphological characteristics were also analyzed, and parameter prediction, experimental validation and analysis were carried out with the aim of reducing the surface roughness. The results show that the cladding layers mainly exhibits wavy, raised and flat shape at different scanning intervals, with a large difference in morphology. The microstructure of the cladding layer mainly consists of cellular crystals and columnar dendritic crystals, and the microstructure is different at different positions. The surface roughness of the material was significantly reduced after cutting, but the knife marks were obvious, exposing the unfused cracks, holes and other defects generated by the additive manufacturing process. Through the orthogonal cutting experiments, it was analyzed that the degree of influence of each parameter on the machined surface roughness is feed rate>depth of cut>spindle speed. Through the effect curve predicted the lowest surface roughness parameters spindle speed of 11 000 r/min, feed rate of 1.5 mm/min, depth of cut of 0.5 mm, the minimum value of roughness at this time is 0.373 μm, compared with the orthogonal cutting experiments, the lowest roughness results in a reduction of 11.4%. The top of the cladding layer produced work hardening after the cutting process, which increased by 10.5% compared with that before the cutting process. The aim of this study is to improve the surface quality of additive manufacturing materials, and to provide reference for the research of additive manufacturing materials post-treatment.

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additive manufacturing / maraging steel / orthogonal experiment / milling process / surface roughness / hardness

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YANG Zeyu, LI Weimin, ZHANG Yanpeng, et al. Optimization and analysis of surface milling parameters of additive manufacturing maraging steel[J]. Iron and Steel, 2024, 59(6): 135-144 https://doi.org/10.13228/j.boyuan.issn0449-749x.20240091

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