3.5 GPa級マルエージング鋼の微細組織

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  • Microstructures of a 3.5 GPa Grade Maraging Steel
  • 3 5GPaキュウ マルエージング コウ ノ ビサイ ソシキ

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Changes in hardness and microstructure during aging at 773 K (500°C) of a 3.5 GPa grade maraging steel having the concentration of 8%Ni-14%Mo-20%Co-58%Fe with or without pre-cold-working after quenching from 1623 K (1350°C) have been observed by transmission electron microscopy and electron diffraction. Results obtained are as follows:<BR>(1) The hardness increased rapidly after short time aging. In these specimens modulated structures have been observed. The wave length was several nano-meters and increased by pre-cold-working.<BR>(2) The wave length of modulated structures in over-aged specimens aged for 300 h was about 50 nm, and M2Mo (Laves phase) particles severel nano-meters in diameter precipitated densely in the Mo-enriched zones in the modurated structure in the in-situ manner. However, the contrast of modurated structure was indistinct, and increase of the wave length during aging was suppressed by pre-cold-working. Consequently, the dispersion of precipitated M2Mo particles was more uniform than that in the specimen without pre-cold-working.

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