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Fracture behaviour of the 304 stainless steel with micro-EDMed micro-holes

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Abstract

Micro-electrical discharge machining (EDM) is an ideal technique for micro-hole drilling of 304 stainless steel. However, the local stress raiser at the holes and the concomitant microcracks generally leads to the strength degradation. In order to explore the appropriate approach of post-treatment to improve the degraded strength, a series of experiments were carried out to systematically understand the fracture behaviour of the 304 stainless steel with micro-EDMed micro-holes. In this study, array holes (3 × 3) with the diameter of 0.7 mm were fabricated by micro-EDM in the 304 stainless steel. The stress–strain curves and tensile fracture topography demonstrate that the fracture form of the micro-EDMed sample belongs to the combination of quasi-cleavage fracture and ductile fracture. By comparing the metallographic characterizations and the microhardness of specimens with and without micro-EDM, it is found that slippage occurs in the grains near the fracture of the micro-EDMed specimen and the elongation of grain is hardly observed. It is considered as the main reason that work hardening and grain refinement of the molten solidified layer formed during EDM limit the elongation of the surrounding grains.

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Acknowledgements

The authors would like to thank Key Laboratory of Advanced Manufacturing Technology for Mold &Die, Shenzhen University, and School of Materials and Electromechanics, Jiangxi Science and Technology Normal University, and School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong for their support to this work. Also, the authors would really appreciate Guoqiang Li for providing access to Metallographic test and SEM observation at the School of Metallurgy and Materials.

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Authors and Affiliations

  1. School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, NSW, 2522, Australia

    Yu Liu

  2. Shenzhen Key Laboratory of Advanced Manufacturing Technology for Mold and Die, Shenzhen University, Guangdong, 518060, People’s Republic of China

    Chenxue Wang, Xiaole Yang & Fei Sun

  3. School of Materials and Electromechanics, Jiangxi Science and Technology Normal University, Nanchang, 330013, People’s Republic of China

    Jia Song

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  1. Yu Liu
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  3. Xiaole Yang
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Correspondence to Chenxue Wang.

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Technical Editor: Adriano Fagali de Souza.

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Liu, Y., Wang, C., Yang, X. et al. Fracture behaviour of the 304 stainless steel with micro-EDMed micro-holes. J Braz. Soc. Mech. Sci. Eng. 42, 264 (2020). https://doi.org/10.1007/s40430-020-02361-y

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  • DOI: https://doi.org/10.1007/s40430-020-02361-y

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