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Microstructures and mechanical properties of hot isostatically pressed powder metallurgy Alloy APK-1

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Abstract

The influence of Hot Isostatic Pressing (HIP) and heat treatment parameters on the microstructure and mechanical properties of powder metallurgy alloy APK-1 (a low carbon modification of Astroloy) has been investigated. Poor mechanical properties result if carbide networks are present along the prior particle boundaries (PPBs). These networks which form during powder consolidation can be avoided by manipulating HIP parameters. Heat treatments which produce a large volume fraction of fine γ’ make this alloy susceptible to environment-assisted tensile embrittlement around 760 °C.

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Authors and Affiliations

  1. Defence Metallurgical Research Laboratory, Hyderabad-500258, India

    T. L. Prakash (Scientists), Y. N. Chari (Senior Scientific Assistant) & E. S. Bhagiradha Rao

Authors
  1. T. L. Prakash
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  2. Y. N. Chari
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  3. E. S. Bhagiradha Rao
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  4. R. Thamburaj
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Additional information

Formerly with Defence Metallurgical Research Laboratory, is now with the Department of Mechanical Engineering, Carleton University, Ottawa, Ontario K1S 5B6, Canada.

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Prakash, T.L., Chari, Y.N., Rao, E.S.B. et al. Microstructures and mechanical properties of hot isostatically pressed powder metallurgy Alloy APK-1. Metall Trans A 14, 733–742 (1983). https://doi.org/10.1007/BF02643790

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  • DOI: https://doi.org/10.1007/BF02643790

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