Effect of scanning strategy on microstructure properties of 316L/IN718 gradient materials prepared by HTSLM

SU Meixia; JIANG Fengchun; WANG Minle; ZHANG Mengxing; CHU Weihan; LIU Yu; WANG Changjun

doi:10.13228/j.boyuan.issn0449-749x.20240205

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Iron and Steel ›› 2024, Vol. 59 ›› Issue (10) : 130-140. DOI: 10.13228/j.boyuan.issn0449-749x.20240205

Materials

Effect of scanning strategy on microstructure properties of 316L/IN718 gradient materials prepared by HTSLM

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Abstract

With the increasing demand for high-performance materials in modern industry, functionally graded materials（FGM） have attracted extensive attention due to their characteristics of different properties in different regions.Nickel-iron-based FGM has important application prospects in aerospace, petrochemical and other fields due to its excellent high/low temperature composite comprehensive mechanical properties and corrosion resistance.While the limitations of traditional manufacturing methods in manufacturing FGMs limit their application, additive manufacturing techniques provide the foundation for fabricating complex FGM structures by manufacturing highly complex parts with reduced losses. The effects of scanning strategies（scanning methods, different lap ratios） on the porosity, microstructure and mechanical properties of 316L/IN718 functionally graded materials were studied by high-throughput selective laser melting equipment（HTSLM）,and The results show that the influence of the scanning method on the 316L/IN718 functional gradient material is greater than the lap rate,and the tensile strength and yield strength of 316L/IN718 functional gradient material formed by strip scanning method and scanning spacing equal to laser spot diameter were the highest, which were 854 MPa and 676 MPa, respectively.With the decrease of IN718 content, the columnar grains dominated by Laves phase in the microstructure decreased, the microhardness of the gradient material decreased linearly, and the decrease of Ni, Nb and Mo solution increment is the main reason for the decrease of microhardness, while the rapid change of composition and the existence of Laves phase were important reasons for poor interfacial bonding performance and crack formation.The results of this study will help to select appropriate scanning strategies, understand the forming mechanism of high-throughput selective laser melting to fabricate functionally graded materials, and compare the microstructure and mechanical properties of 316L/IN718 FGM under different scanning methods and lap ratios, aiming to provide useful guidance and reference for the fabrication of high-quality functional-graded materials.

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functionally graded material / high-flux selective laser melting / nickel-iron base / microstructure / mechanical property

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SU Meixia, JIANG Fengchun, WANG Minle, et al. Effect of scanning strategy on microstructure properties of 316L/IN718 gradient materials prepared by HTSLM[J]. Iron and Steel, 2024, 59(10): 130-140 https://doi.org/10.13228/j.boyuan.issn0449-749x.20240205

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