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Microstructure and machinability of selective laser melted high-strength maraging steel with heat treatment
Journal of Materials Processing Technology ( IF 6.3 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.jmatprotec.2020.116906
Yuchao Bai , Cuiling Zhao , Jin Yang , Ruochen Hong , Can Weng , Hao Wang

Abstract Additive manufacturing (AM) provides a higher degree-of-freedom manufacturing process for high-mix low-volume manufacturing. However, the as-built surface quality by AM processes is generally inferior to that fabricated by conventional subtractive manufacturing and the machinability investigation for post-processing of additively manufactured (AMed) parts is insufficient. In this paper, milling experiments are undertaken to improve the surface finish of the AMed high-strength maraging steel (18Ni300) manufactured by additive manufacturing with and without heat treatment. The influence of microstructure on the machinability is explored, including microhardness, cutting force, surface roughness, tool wear, and chip formation. Significant variation in machinability is identified between the AMed samples that feature distinct microstructures. Surface microhardness of the as-built and heat-treated samples both increased after milling. Cutting forces and tool wear increased sharply after ageing treatment but only a minor change was observed in the as-built samples and those subjected to solution treatment. Roughness value of the as-built samples was reduced from ∼10 to

中文翻译:

选择性激光熔化热处理高强度马氏体时效钢的显微组织和切削加工性

摘要 增材制造 (AM) 为高混合小批量制造提供了更高自由度的制造工艺。然而,增材制造工艺的完工表面质量通常不如传统的减材制造,而且增材制造 (AMed) 零件后加工的可加工性研究不足。在本文中,进行了铣削实验以改善通过热处理和不热处理的增材制造制造的 AMed 高强度马氏体时效钢 (18Ni300) 的表面光洁度。探讨了微观结构对切削加工性的影响,包括显微硬度、切削力、表面粗糙度、刀具磨损和切屑形成。在具有不同微观结构的 AMed 样品之间确定了可加工性的显着差异。研磨后的成品和热处理样品的表面显微硬度均增加。时效处理后切削力和刀具磨损急剧增加,但在完工样品和经过固溶处理的样品中仅观察到微小的变化。竣工样品的粗糙度值从~10降低到
更新日期:2021-02-01
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