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<p>In this study, Partitioned Alloy Component Healing (PACH) and mechanical alloying (MA) were used for the first time to braze the wide gap joint of René 142 superalloy. The filler powder with optimized chemical composition (containing Ni, Cr, Co, Al, Ta, W, Ti, Mo, Hf and Re) without Si and with reduced B concentration was produced by 100&#xa0;h of mechanical alloying. The results showed that after 60&#xa0;h, the particle size decreased from 50&#xa0;μm to below 100&#xa0;nm and chemical homogeneity at the nanoscale was achieved. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) analyses confirmed the formation of a uniform face-centered cubic (FCC) phase and an increase in internal residual stresses. After vacuum brazing and diffusion cycle, a void-free and crack-free joint with a uniform diffusion zone (DZ) was formed. The hardness of the joint zone was measured to be 345 HV on average, which was lower than that of the base metal (420 HV), but this was due to the absence of the γ′ reinforcing phase and coarse-grained structure that could help improve creep resistance. Field emission scanning electron microscopy (FESEM) analysis showed that refractory elements were uniformly distributed and brittle boride and oxide phases were formed in negligible amounts. This method is proposed as an economical and effective solution for the regeneration of superalloy parts.</p>

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Mechanical alloying of filler for René 142 superalloy wide-gap brazing via partitioned alloy component healing (PACH) method

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Alireza Roozbahani,
  • Hassan Abdoos,
  • Omid Bayat

摘要

In this study, Partitioned Alloy Component Healing (PACH) and mechanical alloying (MA) were used for the first time to braze the wide gap joint of René 142 superalloy. The filler powder with optimized chemical composition (containing Ni, Cr, Co, Al, Ta, W, Ti, Mo, Hf and Re) without Si and with reduced B concentration was produced by 100 h of mechanical alloying. The results showed that after 60 h, the particle size decreased from 50 μm to below 100 nm and chemical homogeneity at the nanoscale was achieved. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) analyses confirmed the formation of a uniform face-centered cubic (FCC) phase and an increase in internal residual stresses. After vacuum brazing and diffusion cycle, a void-free and crack-free joint with a uniform diffusion zone (DZ) was formed. The hardness of the joint zone was measured to be 345 HV on average, which was lower than that of the base metal (420 HV), but this was due to the absence of the γ′ reinforcing phase and coarse-grained structure that could help improve creep resistance. Field emission scanning electron microscopy (FESEM) analysis showed that refractory elements were uniformly distributed and brittle boride and oxide phases were formed in negligible amounts. This method is proposed as an economical and effective solution for the regeneration of superalloy parts.