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To increase the hardness and specific wear resistance (SWR), the AISI-D2 die steel underwent an electrical discharge coating (EDC) procedure utilizing graphite powder mixed with dielectric fluid. SWR was measured with the help of pin-on-disc tribometer. Utilizing Taguchi’s DOE technique and the ANOVA method, the experiment was optimized based on the design of the L-27 orthogonal array. Hard intermetallics based on Fe7C3, Cr3C2, and Fe3C (iron carbide) formed during EDC were primarily responsible for the improvement in hardness up to 1089.23 HV0.5 compared to the hardness of the basic material 275 HV0.5 and in SWR up to 523.245 Nm mm−3 × 103 compared to the SWR of the basic material 236.17 Nm mm−3 × 103. The influence of Poff was found to be predominant in determining the higher microhardness and SWR among the peak current (Ip), pulse off-time (Poff), and pulse on-time (Pon).

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Taguchi Optimization of AISI D-2 Die Steel Using Graphite-Based Electrical Discharge Coating (EDC)

  • 会议论文

  • 发表日期：

    2025年

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  • Mohit Singhal,
  • Shalini Singh,
  • Jogendra Bharti,
  • Muthukannan Duraiselvam,
  • Anurag Harsh

摘要

To increase the hardness and specific wear resistance (SWR), the AISI-D2 die steel underwent an electrical discharge coating (EDC) procedure utilizing graphite powder mixed with dielectric fluid. SWR was measured with the help of pin-on-disc tribometer. Utilizing Taguchi’s DOE technique and the ANOVA method, the experiment was optimized based on the design of the L-27 orthogonal array. Hard intermetallics based on Fe7C3, Cr3C2, and Fe3C (iron carbide) formed during EDC were primarily responsible for the improvement in hardness up to 1089.23 HV0.5 compared to the hardness of the basic material 275 HV0.5 and in SWR up to 523.245 Nm mm−3 × 103 compared to the SWR of the basic material 236.17 Nm mm−3 × 103. The influence of Poff was found to be predominant in determining the higher microhardness and SWR among the peak current (Ip), pulse off-time (Poff), and pulse on-time (Pon).