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<p>Ni-based superalloys have high demand in aero-industry components that operate at high temperatures. The main challenge in developing the superalloy is to select the proper composition and post-treatment procedure, which are responsible for the development of the hard phase (in situ reinforcement phase, such as γ’ and other intermetallics) that will significantly contribute to high strength at high temperature. This paper investigates the effect of varying iron in Ni-based superalloys, which is responsible for significantly reducing the cost of alloys. Here, elemental powders are blended for 8 hours in a planetary ball mill, followed by cold compaction at 600&#xa0;MPa. All the green pellets are sintered at 1100&#xa0;°C and 1200&#xa0;°C for 2 hours. The objective of this paper is to investigate the influence of variation in powder composition and sintering temperature on microstructure and mechanical properties. The microstructure and phase evaluation of the powder and the sintered samples were carried out using SEM and XRD analysis. It was observed that the sintered sample consists of intermetallic phases such as Ni<sub>3</sub>Al, Ni<sub>3</sub>Cr, and Ni<sub>3</sub>Fe. It is revealed that densification, hardness, and elastic modulus values increase with the increase in temperature. The 1200&#xa0;°C sintered sample (S3) achieved the higher value of hardness, 6.78 GPa, and elastic modulus, 293.54 GPa, in comparison with other sets of compositions and sintering temperatures.</p>

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Effect of Variation of Iron (15-21 wt.%) Content on Microstructure and Mechanical Properties of Nickel-Based Superalloy Prepared by Powder Metallurgy Technique

  • 期刊论文

  • 发表日期：

    2026年2月12日

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  • Sudhir Kumar Mahanta,
  • Jagadish Parida,
  • Bikash Chandra Behera,
  • Ajit Behera

摘要

Ni-based superalloys have high demand in aero-industry components that operate at high temperatures. The main challenge in developing the superalloy is to select the proper composition and post-treatment procedure, which are responsible for the development of the hard phase (in situ reinforcement phase, such as γ’ and other intermetallics) that will significantly contribute to high strength at high temperature. This paper investigates the effect of varying iron in Ni-based superalloys, which is responsible for significantly reducing the cost of alloys. Here, elemental powders are blended for 8 hours in a planetary ball mill, followed by cold compaction at 600 MPa. All the green pellets are sintered at 1100 °C and 1200 °C for 2 hours. The objective of this paper is to investigate the influence of variation in powder composition and sintering temperature on microstructure and mechanical properties. The microstructure and phase evaluation of the powder and the sintered samples were carried out using SEM and XRD analysis. It was observed that the sintered sample consists of intermetallic phases such as Ni3Al, Ni3Cr, and Ni3Fe. It is revealed that densification, hardness, and elastic modulus values increase with the increase in temperature. The 1200 °C sintered sample (S3) achieved the higher value of hardness, 6.78 GPa, and elastic modulus, 293.54 GPa, in comparison with other sets of compositions and sintering temperatures.