Fatigue properties of resistance spot‐welded maraging steel produced by selective laser melting

Shi, Yandong; Luo, Chen; Li, Wenkai; Shi, Liting; Zhang, Yansong; Su, Xuming

doi:10.1111/ffe.14009

Fatigue Fract Eng Mat Struct

2023

DOI: 10.1111/ffe.14009

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Fatigue properties of resistance spot‐welded maraging steel produced by selective laser melting

Yandong Shi¹,

Chen Luo

Wenkai Li³

et al.

Abstract: This research study investigates the fatigue properties of resistance spot welds (RSWs) made from selective laser-melted (SLMed) maraging steel (MS1) and compares them with dual-phase (DP) steel RSWs. The findings reveal that MS1 spot welds exhibit superior fatigue properties compared with DP steel RSWs, regardless of the printing orientation of the MS1 substrate. Furthermore, fatigue fracture occurs at the MS1 substrate, with a transition of fracture location observed from MS1 to itself and MS1-to-DP600 dissi… Show more

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Cited by 2 publications

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High-temperature exposure of the high-strength 18Ni-300 maraging steel manufactured by laser powder bed fusion: oxidation, structure and mechanical changes

Strakosova,

Průša,

Jiříček

et al. 2024

J Mater Sci

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The present work describes the effect of long-term (8 weeks) high-temperature oxidation (500 °C) on the formation of an oxide layer as well as on the microstructure and mechanical properties of the 3D-printed 18Ni-300 maraging steel. For this purpose, samples produced by additive manufacturing in the as-built and the as-built + solution annealed and aging treated states were used. The as-built + solution annealed and aging treated material was found to be more prone to oxide layer formation due to a homogeneously distributed Ni3Mo intermetallic phase in the material matrix compared to the as-built material. The 8 weeks long exposure to a temperature of 500 °C has caused the formation of a thick oxide layer that exhibited a very bad adhesion with the metal matrix/oxide. The X-ray diffraction analysis confirmed the formation of a layer with a complex phase composition: martensite, austenite, Fe2O3, and Fe3O4. Moreover, the presence of CoFe2O4 was determined on the thin outer oxide layer using X-ray photoelectron spectroscopy. The phenomenon of over-aging was found to be the most significant after the first week of high-temperature oxidation. Then, a negligible change in the microhardness was observed throughout the entire experiment. X-ray diffraction analysis and energy dispersive spectroscopy confirmed the phase composition of the alloy corresponding to 75% of martensite + 25% of austenite as well as the change of Ni3Mo precipitate to Ni3(Mo, Ti) type after the long-term oxidation.

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High-temperature exposure of the high-strength 18Ni-300 maraging steel manufactured by laser powder bed fusion: oxidation, structure and mechanical changes

Strakosova,

Průša,

Jiříček

et al. 2024

J Mater Sci

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show abstract

Research on Laser Melting Powder Layer Shrinkage Process Based on Moving Mesh Technology

Tang,

Shu

2024

Applied Mathematics and Nonlinear Sciences

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During the melting and solidification process, volume shrinkage occurs in the corresponding parts of the selected laser melted powder layer, which further affects the temperature distribution of the powder layer. It is urgent to conduct corresponding analysis and research on the influencing factors of its process parameters. This paper is based on the finite element method and adopts the moving mesh technology to establish an equivalent model for the shrinkage of the selected laser melting powder layer. The influence of shrinkage on the simulated temperature distribution of the selected laser melting is analyzed, and the temperature field distribution of the powder layer under different laser powers and scanning speeds is further analyzed, verifying the feasibility of the model. The results show that by using an appropriate grid movement speed, the powder layer shrinkage of selected laser melting and forming can be effectively simulated under different laser powers and scanning speeds. The shrinkage model can better simulate the temperature field distribution of selected laser melting. This method provides a new approach for achieving equivalent simulation of volume shrinkage of powder layer during selective laser melting and forming process.

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Fatigue properties of resistance spot‐welded maraging steel produced by selective laser melting

Cited by 2 publications

References 34 publications

High-temperature exposure of the high-strength 18Ni-300 maraging steel manufactured by laser powder bed fusion: oxidation, structure and mechanical changes

High-temperature exposure of the high-strength 18Ni-300 maraging steel manufactured by laser powder bed fusion: oxidation, structure and mechanical changes

Research on Laser Melting Powder Layer Shrinkage Process Based on Moving Mesh Technology

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