Re-dissolution of VN during Tempering in High Chromium Heat Resistant Martensitic Steel
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概要
- 論文の詳細を見る
Precipitation behavior of VN during isothermal tempering at 740-800°C of 7%Cr-0.4%V-0.09%N steel (% denotes mass%, hereinafter) has been studied. Initially, rapid softening takes place accompanied by the precipitation of VN and, after that, the quasi-steady state in a hardness vs. tempering time diagram is continuing for a while. After the quasi-steady state, re-dissolution of VN particles rapidly occurs followed by final precipitation of VN. Just before the peak time of the re-dissolution of VN particles, both the temporal decrease in hardness and the temporal increase in the integral breadth of an X-ray diffraction peak take place. The similar precipitation phenomenon is confirmed in 0.14%C-9%Cr-1%Mo-0.2%V-0.09%Nb steel. In both steels the re-dissolution of VN or NbC (hereinafter MX) accompanies the decomposition of martensite. The following reactions are suggested as a mechanism for the re-dissolution of MX type particles: local stresses induced by the recovery of martensite unlock the pinning of dislocations by the MX type particles and the consequent isolated particles, which become energetically unstable, are re-dissolving into the matrix.
- 社団法人 日本鉄鋼協会の論文
- 2004-01-15
著者
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Esaka Hisao
Department Of Materials Science & Engineering National Defense Academy
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Shinozuka Kei
Department Of Materials Science And Engineering National Defense Academy
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Esaka H
Department Of Materials Science And Engineering National Defense Academy
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ESAKA Hisao
National Defense Academy, Department of Materials Science and Engineering
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SHINOZUKA Kei
National Defense Academy, Department of Materials Science and Engineering
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TAMURA Manabu
National Defense Academy, Department of Materials Science and Engineering
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Iida Takahiro
Graduate School Of National Defense Academy
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Esaka H
National Defense Academy Materials Science And Engineering
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Tamura Manabu
Department Of Materials Science And Engineering National Defense Academy
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Tamura M
Department Of Materials Science And Engineering National Defense Academy
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KUSUYAMA Hiroyasu
Graduate School of National Defense Academy
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Tamura Manabu
National Defense Academy Dept. Of Materials Science & Engineering
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Shinozuka Kei
Department of Materials Science and Engineering, National Defense Academy
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Iida Takahiro
Graduate School of Frontier Sciences, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
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