Vaporization of Mn from surface of Fe-Cr-Mn alloy

Kaoru Tada, Yoshimi Hisatsune, Tetsuo Fujiwara, Masao Yamamoto

研究成果: ジャーナルへの寄稿記事

抄録

In order to develop a new surface modification utilizing vapor pressure differences among alloy elements, the vaporization of Mn, which has high vapor pressure, from Fe-Cr-Mn alloy was studied. Fe-20%Cr-20%Mn alloy was heated in various atmospheres at temperatures ranging from 1173 to 1373 K. Mass changes for the samples during heat treatment and vaporized materials from the samples were examined. Concentration profiles of the alloy elements were measured before and after heat treatment. The decreases in sample mass during heat treatments were measured. The mass loss was larger at a higher temperature and for a longer time. The materials vaporized from a sample contained Mn more than 98%. The Mn concentration on the sample surface, heat treated in a closed tube, was 13-15%. On the other hand, the Mn concentration on the sample surface, heat treated under a constant pressure using a vacuum pump, was less than 1%. The mass loss for a specimen heat treated under a constant vacuum pressure increased with the square root of heat time and the surface Mn concentration did not depend on the vacuum conditions, temperatures or time. A concentration gradient under a surface was produced by Mn vaporization. The concentration profiles split into two regions. The Mn concentration gradient was lower at the surface site and higher at the base metal side. The decrease of the Mn concentration is considered to cause the phase change from gamma to alpha. Under the heat condition for a constant vapor pressure, the activation energy for Mn vaporization is 248 kJ/mol and is consistent with that for Mn diffusion in alpha iron. On the assumption that the vaporization behavior is controlled by the diffusion of Mn, the Mn concentration profiles were calculated. The results agreed with the measured profiles for Mn concentration using EPMA.

元の言語英語
ページ(範囲)168-174
ページ数7
ジャーナルNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
56
発行部数2
DOI
出版物ステータス出版済み - 1 1 1992
外部発表Yes

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Vaporization
Vapor pressure
Heat treatment
heat
Vacuum
vapor pressure
Vacuum pumps
heat treatment
Electron probe microanalysis
profiles
Temperature
Surface treatment
Iron
Activation energy
Metals
Hot Temperature
vacuum pumps
gradients
vacuum
activation energy

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

これを引用

Vaporization of Mn from surface of Fe-Cr-Mn alloy. / Tada, Kaoru; Hisatsune, Yoshimi; Fujiwara, Tetsuo; Yamamoto, Masao.

:: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, 巻 56, 番号 2, 01.01.1992, p. 168-174.

研究成果: ジャーナルへの寄稿記事

Tada, Kaoru ; Hisatsune, Yoshimi ; Fujiwara, Tetsuo ; Yamamoto, Masao. / Vaporization of Mn from surface of Fe-Cr-Mn alloy. :: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals. 1992 ; 巻 56, 番号 2. pp. 168-174.
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title = "Vaporization of Mn from surface of Fe-Cr-Mn alloy",
abstract = "In order to develop a new surface modification utilizing vapor pressure differences among alloy elements, the vaporization of Mn, which has high vapor pressure, from Fe-Cr-Mn alloy was studied. Fe-20{\%}Cr-20{\%}Mn alloy was heated in various atmospheres at temperatures ranging from 1173 to 1373 K. Mass changes for the samples during heat treatment and vaporized materials from the samples were examined. Concentration profiles of the alloy elements were measured before and after heat treatment. The decreases in sample mass during heat treatments were measured. The mass loss was larger at a higher temperature and for a longer time. The materials vaporized from a sample contained Mn more than 98{\%}. The Mn concentration on the sample surface, heat treated in a closed tube, was 13-15{\%}. On the other hand, the Mn concentration on the sample surface, heat treated under a constant pressure using a vacuum pump, was less than 1{\%}. The mass loss for a specimen heat treated under a constant vacuum pressure increased with the square root of heat time and the surface Mn concentration did not depend on the vacuum conditions, temperatures or time. A concentration gradient under a surface was produced by Mn vaporization. The concentration profiles split into two regions. The Mn concentration gradient was lower at the surface site and higher at the base metal side. The decrease of the Mn concentration is considered to cause the phase change from gamma to alpha. Under the heat condition for a constant vapor pressure, the activation energy for Mn vaporization is 248 kJ/mol and is consistent with that for Mn diffusion in alpha iron. On the assumption that the vaporization behavior is controlled by the diffusion of Mn, the Mn concentration profiles were calculated. The results agreed with the measured profiles for Mn concentration using EPMA.",
author = "Kaoru Tada and Yoshimi Hisatsune and Tetsuo Fujiwara and Masao Yamamoto",
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N2 - In order to develop a new surface modification utilizing vapor pressure differences among alloy elements, the vaporization of Mn, which has high vapor pressure, from Fe-Cr-Mn alloy was studied. Fe-20%Cr-20%Mn alloy was heated in various atmospheres at temperatures ranging from 1173 to 1373 K. Mass changes for the samples during heat treatment and vaporized materials from the samples were examined. Concentration profiles of the alloy elements were measured before and after heat treatment. The decreases in sample mass during heat treatments were measured. The mass loss was larger at a higher temperature and for a longer time. The materials vaporized from a sample contained Mn more than 98%. The Mn concentration on the sample surface, heat treated in a closed tube, was 13-15%. On the other hand, the Mn concentration on the sample surface, heat treated under a constant pressure using a vacuum pump, was less than 1%. The mass loss for a specimen heat treated under a constant vacuum pressure increased with the square root of heat time and the surface Mn concentration did not depend on the vacuum conditions, temperatures or time. A concentration gradient under a surface was produced by Mn vaporization. The concentration profiles split into two regions. The Mn concentration gradient was lower at the surface site and higher at the base metal side. The decrease of the Mn concentration is considered to cause the phase change from gamma to alpha. Under the heat condition for a constant vapor pressure, the activation energy for Mn vaporization is 248 kJ/mol and is consistent with that for Mn diffusion in alpha iron. On the assumption that the vaporization behavior is controlled by the diffusion of Mn, the Mn concentration profiles were calculated. The results agreed with the measured profiles for Mn concentration using EPMA.

AB - In order to develop a new surface modification utilizing vapor pressure differences among alloy elements, the vaporization of Mn, which has high vapor pressure, from Fe-Cr-Mn alloy was studied. Fe-20%Cr-20%Mn alloy was heated in various atmospheres at temperatures ranging from 1173 to 1373 K. Mass changes for the samples during heat treatment and vaporized materials from the samples were examined. Concentration profiles of the alloy elements were measured before and after heat treatment. The decreases in sample mass during heat treatments were measured. The mass loss was larger at a higher temperature and for a longer time. The materials vaporized from a sample contained Mn more than 98%. The Mn concentration on the sample surface, heat treated in a closed tube, was 13-15%. On the other hand, the Mn concentration on the sample surface, heat treated under a constant pressure using a vacuum pump, was less than 1%. The mass loss for a specimen heat treated under a constant vacuum pressure increased with the square root of heat time and the surface Mn concentration did not depend on the vacuum conditions, temperatures or time. A concentration gradient under a surface was produced by Mn vaporization. The concentration profiles split into two regions. The Mn concentration gradient was lower at the surface site and higher at the base metal side. The decrease of the Mn concentration is considered to cause the phase change from gamma to alpha. Under the heat condition for a constant vapor pressure, the activation energy for Mn vaporization is 248 kJ/mol and is consistent with that for Mn diffusion in alpha iron. On the assumption that the vaporization behavior is controlled by the diffusion of Mn, the Mn concentration profiles were calculated. The results agreed with the measured profiles for Mn concentration using EPMA.

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