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Characterization of aluminides formed on superalloy 690 substrate

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Abstract

Ni-Cr-Fe based superalloy 690 substrate, pack aluminized at 1273 K, revealed formation of multilayer comprising (NiCr)Al + Cr5Al8, Ni2Al3 + Cr5Al8, NiAl and γ phases. Knoop hardness number varied from 225 to 1142 along the cross-section. Wear and friction tests on aluminized specimen were performed in dry medium using reciprocating sliding wear and friction machine with tungsten carbide ball at 15 N load with frequencies at 10, 15 and 20 Hz. The coefficient of friction, the static ones were obtained in the vicinity of 0.2, 0.3 and 0.5, while dynamic ones were 0.3, 0.4 and 0.4 respectively. For the ball, the wear rate was 1.9 × 10−6, 1.2 × 10−5 and 1.5 × 10−5 mm3/Nm, whereas the wear rate was 5.8 × 10−5, 3.8 × 10−4 and 4.6 × 10−4 mm3/Nm respectively for the aluminized specimen indicating good adherent surface coating.

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Authors and Affiliations

  1. Materials Science Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India

    R. S. Dutta, U. D. Kulkarni & G. K. Dey

  2. Materials Processing Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India

    S. Majumdar

  3. Refuelling Technology Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India

    P. K. Limaye

Authors
  1. R. S. Dutta
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  2. S. Majumdar
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  3. P. K. Limaye
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  4. U. D. Kulkarni
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  5. G. K. Dey
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Correspondence to R. S. Dutta.

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Dutta, R.S., Majumdar, S., Limaye, P.K. et al. Characterization of aluminides formed on superalloy 690 substrate. Trans Indian Inst Met 64, 31 (2011). https://doi.org/10.1007/s12666-011-0006-8

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  • DOI: https://doi.org/10.1007/s12666-011-0006-8

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