Enhanced mechanical performance of duplex stainless steels via dense core-shell nano-inclusions in-situ formed upon selective laser melting

Zhang, Jiantao; Dong, Haokai; Xi, Xiaoying; Tang, Hao; Li, Xingyi; Rao, J. Babu; Xiao, Zhiyu

doi:10.1016/j.scriptamat.2023.115711

Cited by 9 publications

(3 citation statements)

References 43 publications

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“…The laser energy input of the next layer, to a certain extent, affects the already-formed matrix in the previous layer, causing secondary heating and recrystallization, ultimately leading to the grid-like structure. The microstructure metallography of the specimen when heat-treated at 1200 °C for 1 h is shown in Figure 3c, and it is worth noting that the grid-like mosaic structure in the microstructure remains intact and regular after heat treatment, which is significantly different from the destruction of the grid-like structure that has been observed in previous studies after heat treatment [29][30][31][32][33]. The magnified microstructure shown in Figure 3d reveals that a certain amount of new phase has precipitated on the grain boundaries of the matrix phase and, even after 1 h of heat treatment at 1200 °C, the size remains small.…”

Section: Microstructurementioning

confidence: 68%

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Maintaining Excellent Mechanical Properties via Additive Manufacturing of Low-N 25Cr-Type Duplex Stainless Steel

He,

Lv,

Song

et al. 2023

Materials

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Duplex stainless steel (DSS) exhibits good mechanical properties and corrosion resistance, and has attracted more and more attention within the fields of both science and technology. However, the increasing levels of N and of Cr, Mo, etc., as alloying elements in DSS increase production difficulty. In particular, the N element increases the risk of Cr2N precipitation, which can seriously deteriorate the thermal plasticity of DSS, while increasing its strength. For this reason, a low-N-content 25Cr-type DSS was designed in order to adapt additive manufacturing processes. With regard to the nano-inclusions of oxide precipitation and effective grain refinement, and considering the benefits of selective laser melting fabrication, a low-N 25Cr-type duplex stainless steel with a 0.09 wt.% N content achieved high mechanical properties, with a yield strength of 712 MPa and an elongation of 27.5%, while the V-notch impact toughness was 160 J/cm2. The microstructure evolution and the reasons behind the improvement in mechanical properties will be discussed in detail.

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Section: Microstructurementioning

confidence: 68%

“…In addition, in previous studies, the introduction of high-temperature oxide Al 2 O 3 into the system also leads to an improvement in strength [33,39]. In traditional casting processes, the high-temperature-formed Al 2 O 3 easily grows and producies inclusions during slow cooling, making it difficult to eliminate.…”

Section: Discussionmentioning

confidence: 99%

Maintaining Excellent Mechanical Properties via Additive Manufacturing of Low-N 25Cr-Type Duplex Stainless Steel

He,

Lv,

Song

et al. 2023

Materials

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“…As the oxidation temperature increases, an Mn-rich layer (with a small amount of Si) appears at the substrate interface. At temperatures of 1000-1200 • C, steel undergoes rapid CO 2 production due to excess solid solution gas [28], and the oxidation of C leads to a large gap between the enriched oxide layer of Mn and Fe-O. This phenomenon is related to the fact that the oxide layer of 22MnB5 is prone to blistering and shedding at high temperatures.…”

Section: Effect Of Cr and Si On Oxide Structurementioning

confidence: 99%

Studying the Effect of Cr and Si on the High-Temperature Oxidation-Resistance Mechanism of Hot Stamping Steel

Wu,

Zhang,

Zhu

et al. 2023

Metals

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The surface of hot stamping steel is severely oxidized during heating, holding, and transfer from the heating furnace to the stamping die in the production of traditional automotive parts. Coating-free hot stamping steel with Cr and Si elements exhibits excellent oxidation resistance during hot stamping without the protection of a surface coating. This paper investigates the oxidation behavior of three types of hot stamping steel at 800–1200 °C. The results show that although Cr-Si hot stamping steel performs excellently short-term (≤7.5 min) for oxidation resistance, its long-term (≥15 min) or high-temperature (≥1100 °C) oxidation resistance is much lower than that of the conventional hot stamping steel 22MnB5, affecting the production and surface quality control of the new coating-free Cr-Si hot stamping steel. By analyzing the oxidation kinetics and characterizing the structure of oxide layers in hot stamping steel, it was found that the structural change in the Cr and Si element enrichment layer between the oxide scale and the substrate varied in oxidation performance at different temperatures. When the oxidation temperature was below 1000 °C, the solid Cr and Si enrichment layer acted as a barrier to prevent the diffusion of Fe ions. When the oxidation temperature exceeded 1100 °C, the molten Cr and Si enrichment layer effectively adapted to the substrate and avoided blistering. Meanwhile, Fe2SiO4 penetrated the Fe oxide layer along the grain boundary and became a rapidly diffusing channel of Fe ions, contributing to a significant increase in the oxidation rate.

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Selective Laser Melting of Stainless Steels: A review of Process, Microstructure and Properties

Mansoura,

Omidi,

Barka

et al. 2024

Met. Mater. Int.

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Enhanced mechanical performance of duplex stainless steels via dense core-shell nano-inclusions in-situ formed upon selective laser melting

Cited by 9 publications

References 43 publications

Maintaining Excellent Mechanical Properties via Additive Manufacturing of Low-N 25Cr-Type Duplex Stainless Steel

Maintaining Excellent Mechanical Properties via Additive Manufacturing of Low-N 25Cr-Type Duplex Stainless Steel

Studying the Effect of Cr and Si on the High-Temperature Oxidation-Resistance Mechanism of Hot Stamping Steel

Selective Laser Melting of Stainless Steels: A review of Process, Microstructure and Properties

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