Effects of cutting parameters on roughness and residual stress of maraging steel specimens produced by additive manufact
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ORIGINAL ARTICLE
Effects of cutting parameters on roughness and residual stress of maraging steel specimens produced by additive manufacturing A. R. Oliveira 1 & A. L. Jardini 2,3 & E. G. Del Conte 1 Received: 10 August 2020 / Accepted: 21 October 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract Additive Manufacturing of metallic parts by powder bed fusion (PBF) has great potential to build complex geometries with innovative materials in a broad field of applications; however, it also presents some limitations as residual stresses, porosities, microcracks, and high roughness that restrict your plateau of productivity. Therefore, an alternative to improve the surface condition of PBF parts is the post-processing as milling. Maraging steel 300 is an important material used in the PBF process, considering its application in different segments, like automotive, tooling, and aerospace. Although there are a few works that investigated the effects of cutting parameters on the surface condition of maraging steel 300 components produced by PBF, this work investigated the effects of different cutting speeds (vc) and feed per tooth (fz) on average roughness Ra and residual stress of maraging 300 specimens. The lowest roughness level of Ra = 0.31 μm was obtained with fz = 0.02 mm/tooth and vc = 250 m/min. Furthermore, the cutting speed had a relevant effect on the compressive behavior of residual stresses. The feed per tooth combined with the cutting speed improved the surface roughness and the compressive residual stress of the specimens, showing the importance of considering both these parameters in the milling process planning of PBF maraging steel parts. Keywords Maraging steel 300 . Roughness . Residual stress . Powder bed fusion . Cutting parameters
1 Introduction Additive manufacturing of metallic materials by powder bed fusion (PBF) characterize the fabrication of components based on the fusion of metallic powders disposed on the build platform [1–3]. This layer production occurs due to thermal energy provided by a laser beam that melts the particles to bond them, giving rise to complex shapes [1–3]. Maraging steel 300 is a notable material compatible with the PBF process, considering its application in different segments, such as automotive, tooling, and aerospace [4–7]. The prior properties of this low carbon steel are the high strength and microhardness [6, 7] due to the martensite matrix with intermetallic precipitates * E. G. Del Conte [email protected] 1
Federal University of ABC, Av. dos Estados, 5001, Santo André, SP 09210-580, Brazil
2
School of Chemical Engineering, University of Campinas, Campinas, Brazil
3
National Institute of Biofabrication (INCT-BIOFABRIS), Campinas, Brazil
generated by aging treatment [4, 5, 8], which limits the mobility of dislocations on the microstructure [9]. Although the potential application of PBF technology is noticeable in the industry, the main barriers to its plateau of application are microcracks, pores, and high roughness [2, 10–15].
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