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

• Autorzy: Gong Siqian , Sun Yao , Jin Liya , Su Zhipeng

Identyfikatory

DOI

10.1007/s43452-020-00089-z

• Języki publikacji: EN

Abstrakty

EN

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 microelectrodes 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.

Słowa kluczowe

EN

electrical discharge drilling; microholes; single-crystal nickel-based superalloy; subsurface damage; surface quality

PL

powierzchnia; uszkodzenia powierzchni; mikrootwór; wiercenie

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2020
• Tom: Vol. 20, no. 3
• Strony: 337--352
• Opis fizyczny: Bibliogr. 25 poz., rys., wykr.

Twórcy

autor

Gong Siqian

• School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, No. 3 Shangyuancun, Haidian Distrct, Beijing 100044, People’s Republic of China

autor

Sun Yao

• School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, People’s Republic of China

autor

Jin Liya

• School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, People’s Republic of China

autor

Su Zhipeng

• School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, People’s Republic of China

Bibliografia

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Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021)