Influence of minor boron on the microstructures of a second generation Ni-based single crystal superalloy

Zhao, Yongsheng; Liu, Chenguang; Guo, Yuanyuan; Liu, Yanfei; Zhang, Jian; Luo, Yang; Tang, Ding Zhong

doi:10.1016/j.pnsc.2018.06.001

Cited by 34 publications

(1 citation statement)

References 13 publications

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“…Single-crystal superalloy materials completely eliminate grain boundaries and have better comprehensive physical and chemical properties under high-temperature service conditions, which allow it to be rapidly developed and widely used in the preparation of turbine blades and other advanced thermal structural components [1][2][3]. To balance the effects of inlet high temperature on single-crystal superalloy components, large amounts of micro-holes are fabricated to reduce the temperature, but the surface quality and subsurface damage of these micro-holes will significantly affect the service life of these components [4].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on fabricating micro-holes in DD5 single-crystal nickel-based superalloy using electrical discharge drilling

Gong

Sun

Jin

et al. 2020

Archiv.Civ.Mech.Eng

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The single-crystal superalloy materials have been rapidly developed and widely used in advanced thermal structural components due to their excellent comprehensive physical and chemical properties under high-temperature service conditions. However, conventional micro-hole making results in defects such as edge breakage and burr. In this study, the electrical discharge drilling (EDD) combined with helical microelectrode is first adopted to fabricate DD5 single-crystal nickel-based superalloy. The effects of tool geometry and machining parameters on subsurface damage layer, micro-hole taper, surface morphology, surface roughness and machining time were investigated in detail. Experimental results indicated that helical microelectrode can obtained smoother surface without debris deposition and thinner subsurface damage layer depth lack of micro-cracks compared with cylindrical microelectrodes. Additionally, the computational fluid dynamics model was developed to analyze working fluid movement and reveal effective debris removal mechanism of helical microelectrode. The vortices will be generated in lateral gap fluid between micro-hole and helical microelectrode and have a certain delay time. The surface roughness and dimensional precision of micro-holes fabricated by helical micro-electrodes are greatly improved and machining efficiency is also improved by 30.94% compared to cylindrical microelectrodes. This work could provide theoretical and process guidance to assist in realizing high surface quality and low subsurface damage of micro-holes obtained with EDD process.

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