Study on Mechanism of Strengthening Interface Structure of Dissimilar Materials by Selective Laser Melting

doi:10.3901/JME.2020.03.189

Abstract

Abstract: In order to apply the selective laser melting(SLM) technology with high precision and low efficiency to the manufacturing process of large-scale complex structural parts, sophisticated complex structure can be fabricated by selective laser melting on the traditional machined substrate. However, the bonding performance of the structure with different materials and different manufacturing processes at the interface restricts the performance of the overall structure. In this study, 18Ni300 maraging steel is fabricated by SLM on traditional low-cost Cr8Mo2SiV cold work die steel manufactured by machining method. The microstructure and composition analysis of the interface bonding region are observed by metallographic microscope, scanning electron microscope, etc., and it is found that the additive structure (18Ni300) at the interface is tightly embedded in the substrate structure (Cr8Mo2SiV) to form a structure similar to a toothed mosaic. There is no macro crack in the interface area, and the SLM structure and the substrate achieve a good metallurgical bonding. It is observed in the interface region that the columnar crystals were epitaxially grown through the boundary of the melt channel, and the interface elements are slightly diffused. The analysis shows that the toothed mosaic structure of the interface region and the epitaxial growth morphology of the columnar crystal facilitate the bonding enhancement of the interface structure. Through the analysis of the bonding performance by the tensile testing, it is found that the fracture position of the composite structure tensile specimen is located at the substrate away from the interface, and the obvious strengthening effect is obtained in the interface area, which provides an effective method for efficient and low-cost production of complex molds.

Key words: selective laser melting, dissimilar materials, maraging steel, interface bonding, microstructure and properties

CLC Number:

TH162

LIU Linqing, SONG Changhui, YANG Yongqiang, WENG Changwei. Study on Mechanism of Strengthening Interface Structure of Dissimilar Materials by Selective Laser Melting[J]. Journal of Mechanical Engineering, 2020, 56(3): 189-196.

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