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<p>Ni-based hardfacing alloy (Ni-13Cr-3.6Fe−3.2Si-2B-0.5C; wt pct) namely Deloro 50 (D50) was deposited on 304L austenitic stainless steel (SS) by laser additive manufacturing process. These deposits were characterized using a variety of experimental techniques to understand the changes in microstructure and microchemistry as a function of distance from the deposited interface. The phase formation kinetics was also predicted using thermokinetic simulation tools. Typical solidification structure showing planar growth front followed by cellular and columnar dendrites were observed at the interface and the dilution was limited to 60 ± 10&#xa0;<i>μ</i>m. A low hardness of 340 ± 15 HV0.1 was observed in the dilution zone beyond which hardness remained high at ~ 670 HV0.1 throughout the thickness of the deposit. Away from the interface, D50 deposit had <i>γ</i>-(Ni, Cr, Fe) dendrites with lamellar type fine <i>γ</i>Ni + Ni<sub>3</sub>Si eutectics and globular type <i>γ</i>Ni + Ni<sub>3</sub>B type of eutectics in the interdendritic regions. Rest of the area consisted of randomly distributed borides (CrB and Cr<sub>2</sub>B) and carbides (M<sub>7</sub>C<sub>3</sub>) with distinct morphologies. EPMA microchemical analysis coupled with Rietveld-based XRD analysis gave confirmatory evidence for the formation of various phases. On SS side, grain boundary precipitation and precipitate lean zone at the deposit interface were confirmed by DICTRA simulations.</p>

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Laser Additive Manufactured Deloro 50 Hardfacing Alloy Deposits on Stainless Steel: Microstructure and Phase Stability

  • 期刊论文

  • 发表日期：

    2026年7月25日

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  • T. N. Prasanthi,
  • S. Haribabu,
  • C. P. Paul,
  • Akash Singh,
  • N. Vijayashanthi,
  • C. Sudha

摘要

Ni-based hardfacing alloy (Ni-13Cr-3.6Fe−3.2Si-2B-0.5C; wt pct) namely Deloro 50 (D50) was deposited on 304L austenitic stainless steel (SS) by laser additive manufacturing process. These deposits were characterized using a variety of experimental techniques to understand the changes in microstructure and microchemistry as a function of distance from the deposited interface. The phase formation kinetics was also predicted using thermokinetic simulation tools. Typical solidification structure showing planar growth front followed by cellular and columnar dendrites were observed at the interface and the dilution was limited to 60 ± 10 μm. A low hardness of 340 ± 15 HV0.1 was observed in the dilution zone beyond which hardness remained high at ~ 670 HV0.1 throughout the thickness of the deposit. Away from the interface, D50 deposit had γ-(Ni, Cr, Fe) dendrites with lamellar type fine γNi + Ni3Si eutectics and globular type γNi + Ni3B type of eutectics in the interdendritic regions. Rest of the area consisted of randomly distributed borides (CrB and Cr2B) and carbides (M7C3) with distinct morphologies. EPMA microchemical analysis coupled with Rietveld-based XRD analysis gave confirmatory evidence for the formation of various phases. On SS side, grain boundary precipitation and precipitate lean zone at the deposit interface were confirmed by DICTRA simulations.