Recrystallization of Lath Martensite with Bulge Nucleation and Growth Mechanism

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概要

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• The recrystallization behavior of lath martensite during tempering was investigated in high-chromium martensitic steels by means of hardness testing, optical and transmission electron microscopy. The role of carbide particles on the recrystallization was also discussed in terms of the grain boundary pinning effect. The hardness of tempered specimens was plotted as a function of the tempering parameter, T(logt+20), for a low-carbon steel (Fe–9Cr–0.1C mass%) and an ultra-low carbon steel (Fe–9Cr–1Ni–0.006C mass%). The low-carbon steel exhibited gradual softening with recovery but did not undergo recrystallization. However, the ultra-low carbon steel suffered abrupt softening owing to the discontinuous recrystallization of lath martensite. Microstructural observations in the ultra-low carbon steel indicated that the recrystallization of lath martensite occurs with the bulge nucleation and growth (BNG) mechanism. The possibility of recrystallization via this mechanism depends upon both the spacing of carbide particles on grain boundaries and the dislocation density of martensite. An energetic analysis on the formation of a recrystallized grain revealed the critical carbide spacing minimum required for the occurrence of recrystallization as a function of dislocation density. In the case of the low-carbon steel, carbide precipitates on grain boundaries with spacing smaller than the critical value, thus suppressing recrystallization.

• 社団法人 日本鉄鋼協会の論文
• 2001-09-15

著者

• TAKAKI S.

  Department of Materials Science and Engineering, Graduate School of Engineering, Kyusyu University

• Tsuchiyama T.

  Department Of Materials Science And Engineering Kyushu University

• MIYAMOTO Y.

  Corporate Research & Development Center, NSK Ltd.

• TSUCHIYAMA T.

  Department of Materials Science and Engineering, Kyushu University

関連論文

• Mechanical Properties of Fe-C Alloys with Ultra-fine Grained Ferrite+Cementite Structure Through Mechanical Milling Treatment
• Contribution of Dislocation Strengthening to Yield Strength in Ultra-low Carbon Martensitic Steels
• Ostwald Ripening Behavior of Cu Particles in High Chromium Martensitic Steels
• Recrystallization of Lath Martensite with Bulge Nucleation and Growth Mechanism
• High-resolution TEM Analysis of Defect Structures in Mechanically Milled, Nanocrystalline Fe

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