Tensile Properties of As-Built 18Ni300 Maraging Steel Produced by DED

Abstract

The mechanical behaviour of as-built DED-produced 18Ni300 Maraging steel was studied by manufacturing a wall-like structure from which three different specimen types were obtained: specimens in which the loading direction was the same as the printing direction (vertical), specimens in which these two directions were perpendicular (horizontal), and bimetallic specimens in which the interface between the AISI 1045 substrate and the 18Ni300 steel was tested. The yield strength of the produced samples was 987.9±34.2, 925.9±89.7 and 486.7±47.2MPa for the vertical, horizontal and bimetallic specimens, respectively, while the elongation to failure was 9.4±1.9, 18.3±2.3 and 14.06±0.6% in the same order. The latter specimen failed within the substrate-comprised portion of the specimen. Additionally, the fracture surfaces were analysed through scanning electron microscopy, concluding that while both surfaces consist of dimples, the horizontal specimen presented microporosities with a reduced diameter. A microhardness analysis in the printed wall-like structure following the printing direction yielded an average hardness of 392±21 HV0.3, with fluctuations along the build direction mostly within one standard deviation.

Tensile Strength Improvements of Ramie Fiber Threads through Combination of Citric Acid and Sodium Hypophosphite Cross-Linking

“…The interesting thing is an evaluation regarding the ultimate tensile strength of crosslinked CA/SHP with ramie fiber when compared to Built 18Ni300 Maraging Steel is around MPa 1188.6 ± 12.0 MPa–1209.4 ± 16.5 MPa [ 35 ]. Martensitic steel is significantly more cost-effective than aluminum.…”

Embrittlement Fracture Behavior and Mechanical Properties in Heat-Affected Zone of Welded Maraging Steel

“…The research and development concerning higher hardness and strength continues, establishing maraging steel as a key material in this domain. Over the past decade, metal additive manufacturing techniques, notably direct energy deposition and selective laser melting, have been employed to produce maraging steel components [26][27][28][29][30][31][32]. Additionally, ongoing research efforts in the metal manufacturing industry and academia, including precipitate analysis via transmission electron microscopy (TEM) [33][34][35][36] and atom probe tomography [37,38], as well as first-principle calculations and molecular dynamics studies, aim to enhance the RT strength and fatigue properties of maraging steels.…”