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Influence of Soaking Time on Microstructural, Machinability, and Mechanical Properties of Al-10Si-0.3Mg Alloy Fabricated by Direct Powder Forging

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Abstract

Direct Powder Forging has emerged as a new forming process to produce a forged component at the industry level from compacted powder. In the present work, the direct powder forging technique has been used to fabricate Al-10Si-0.3 Mg alloy in temperatures ranging from 550 to 600 °C. Initially, the stainless-steel (SS-304) canister was filled with pre-alloyed Al-10Si-0.3 Mg powder and compacted at 50 MPa, which was followed by sealing. The canisters were heated to temperatures ranging from 550 to 600 °C for a duration of 2 to 3 h, followed by forging. A total of four samples were prepared to study the effect of soaking time on microstructural development, mechanical properties, and machinability. It was found that an increase in hardness (~59.6HV to ~ 66.1 HV) and tensile strength (~203.07 MPa to ~ 280.5 MPa) with the increase in soaking time from 2 h at 550 °C to 2 h at 550 °C and 15 min at 600 °C, respectively. However, with a further increase in soaking time of 2.5 and 3 h at 550 °C and 15 min at 600 °C, a decrease in UTS value was observed (251.48 MPa). The machinability of the samples was analyzed through the electrical discharge machining hole-drilling operation at three different levels of machining current (1, 2, and 3 A). Machined holes with a maximum drilling rate of 7.03 µm/s and taper angle of around 4.3° were machined without abnormal discharges. The variation in mechanical properties and machining rate of DPF alloys was explained with the help of Si particle size, fraction, and porosity values. Microstructure evolution was studied by using OM, SEM, and EBSD techniques. Fractographs reveal the mixed failure mode which is also used to correlate the limited plastic strain during the deformation.

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Acknowledgements

This work was financially supported by the Science and Engineering Research Board (SERB), Government of India, through (Grant No: EEQ/2020/000306). We extend our heartfelt gratitude to Prof. Shashank Shekhar for the lab facilities. The Advanced Centre of Materials Science (ACMS) at IIT Kanpur deserves our special thanks for materials characterization facilities.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, 208016, India

    Akanksha Dwivedi & S. Gangolu

  2. Department of Mechanical Engineering, National Institute of Technology Hamirpur, Hamirpur, Himachal Pradesh, 177005, India

    Mahavir Singh

  3. Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, 208016, India

    Janakarajan Ramkumar

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  1. Akanksha Dwivedi
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Dwivedi, A., Singh, M., Ramkumar, J. et al. Influence of Soaking Time on Microstructural, Machinability, and Mechanical Properties of Al-10Si-0.3Mg Alloy Fabricated by Direct Powder Forging. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09379-6

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