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Necklace structure obtained by forging Astroloy supersolidus-sintered preforms

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Abstract

A new and original densification process of nickel-based superalloys consists in forging supersolidus-sintered preforms. From the coarse-grained structure of the material sintered in the presence of a liquid phase, forging at a high deformation ratio can lead to a duplex structure (usually called “necklace” structure) as can be obtained by conventional HIP + forge or cast/wrought routes. Optimal forging conditions to form a “necklace” structure have been determined for Astroloy powders. The restoration and recrystallization mechanisms are described in relation to deformation conditions and heat-treatments. Structures and related mechanical behaviour have been characterized. The “necklace” material compares well with conventional direct “HIPed” or forged materials. Good creep-rupture properties are due to large warm-worked grains, and a high resistance to crack initiation and propagation results from recrystallized grains of the duplex structure.

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Jeandin, M. Necklace structure obtained by forging Astroloy supersolidus-sintered preforms. J Mater Sci 17, 2902–2910 (1982). https://doi.org/10.1007/BF00644668

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Keywords

  • Polymer
  • Liquid Phase
  • Recrystallization
  • Mechanical Behaviour
  • Crack Initiation