α′→γ Reverse Transformation in an 18%Ni Maraging Steel

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Other Title
  • 18%Niマルエージング鋼におけるα′→γ逆変態
  • 18%Niマルエージング鋼におけるα′-γ逆変態
  • 18パーセント Ni マルエージング コウ ニ オケル アルファ ガンマ ギャ
  • α′→γ Reverse Transformation in an 18%Ni Maraging Steel

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Abstract

Mechanism of α′→γ reverse transformation has been examined by means of dilatometric measurements, X-ray analysis and structural observations in an 18% Ni maraging steel.<BR>The mechanism is changed in the range of heating rate between 100 and 500°C/min. At the lower heating rates, the stabilization (decrcase in Ms and increase in the content of retained γ) and the unstabilization (increase in Ms) of reverted γ are observed, and this phenomenon is concerned with the partitioning of the solute atoms in α′ during heating. Under these conditions, surface relieves are observed during the reverse transformation and γ grain boundaries inherit the former features completely when heated to the temperature range from Af to γ recrystallization temperature. From the above results, the mechanism of α′→γ reverse transformation at lower heating rates is inferred as follows; first, α′ is partitioned to solute rich and solute poor regions by short range diffusion, and in the subsequent α′→γ transformation, martensitic character participates partially.<BR>On the other hand, at the higher heating rates, either stabilization or unstabilization of the reverted γ is not observed, and accordingly it is considered that α′ transforms to γ martensitically without the diffusion process.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 64 (5), 595-604, 1978

    The Iron and Steel Institute of Japan

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