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Mechanism of Cellular Precipitation of Alloy Carbides and Nitrides in Multi-component Alloy Systems

Research Project

Project/Area Number 62460192
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 金属材料(含表面処理・腐食防食)
Research InstitutionTokyo Institute of Technology

Principal Investigator

KIKUCHI Makoto  Tokyo Institute of Technology Faculty of Engineering Profess, 工学部, 教授 (30089817)

Project Period (FY) 1987 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥8,500,000 (Direct Cost: ¥8,500,000)
Fiscal Year 1989: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1988: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1987: ¥7,700,000 (Direct Cost: ¥7,700,000)
KeywordsCellular Precipitation / Grain Boundary Reaction / Fe-Cr-Ni-N Alloys / Cr_2N / Electron Probe Micro-Analysis / Long Range Diffusion / Nitrogen Analysis / Cr-Niオ-ステナイト鋼 / 窒素分析法 / 2相ステンレス鋼 / 窒素分配 / Cr_2N析出 / 窒素の拡散係数 / FeーCrーNiーN合金
Research Abstract

1. Nitrogen Analysis by Electron Probe Microanaiyzer:
A method of nitrogen analysis was established for solution nitrogen in Cr-Ni austenitic steels in a concentration range between 0 and 1 wt% with an accuracy of 0.01 wt%. Seven calibration curves for nitrogen were determined in austenitic steels with different Cr, Ni and Mo concentrations. A newly developed dispersion element designed for nitrogen analysis was employed.
2. Nitrogen Concentration Profiles in both Untransformed Matrix and Cell: Nitrogen concentration profiles in both untransformed matrix and cell in a 25Cr-2ONi-0.59N austenitic steel aged at 800゚C were experimentally measured in terms of the newly established method described the previous section. It was directly confirmed that nitrogen flows into cell through a long range diffusion from the untransformed matrix to the cell, accompanying with the cell growth.
3. Model for a Growth Mechanism of Cellular Precipitation in Multi-Component Systems: A model, developed by Hillert to explain growth features for the cellular precipitation in substitutional binary systems, has successfully been extended to a multi-component system involving both substitutional and interstitial alloying elements. Our model explains apparently unusual growth features of the cellular precipitation of Cr_2N in high nitrogen Cr-Ni austenitic steels. The long range diffusion of nitrogen described in the previous section reduces the driving force for cell boundary migration. This reduction of migration rate of the cell boundary leads to chromium diffusion ahead of the migrating boundary, which in turn further reduces the driving force for the cell boundary migration.

Report

(4 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • 1987 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] M.Kajihara,M.Kikuchi and S.K.Choi: "Cellular Precipitation of Cr_2N in Chromium-Nickel Austenitic Steels" Proceedings of International Conference on Phase Transformations '87,ed.G.W.Lorimer.The Institute of Metals. 265-268 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] M.Kikchi,T.Urabe,G.Cliff and G.W.Lorimer: "The Loss of Driving Force Due to Volume Diffusion Ahead of a Migrating Boundary in a Cellular Precipitation Reaction" Acta Metallurgica et Materialia(in print). 38. (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] M. Kajihara, M. Kikuchi and S.K. Choi: "Cellular Precipitation of Cr_2N in Chromium-Nickel Austenitic Steels" Proceedings of International Conference on Phase Transformations '87, ed. G.W.Lorimer, The Institute of Metals pp.265-268, (1988).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] M. Kikuchi, T. Urabe, G. Cliff and G.W.Lorimer: "The Loss of Driving Force Due to Volume Diffusion Ahead of a Migrating Boundary in a Cellular Precipitation Reaction" Acta Metallurgica et Materialia, 38- (1990).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Makoto KIKUCHI et al: "Solubility of Nitrogen in Austenitic Stainless Steels" Proceedings of International Conference on High Nitrogen Steels ed.J.Foct and A.Hendry The Institute of Metals. 63-74 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Makoto KIKUCHI et al: "Mechanism of Widmanstatten Plate Formation in Chromium-Rich Cr-Ni Alloys" Acta Metallurgica. 38. 165-171 (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] Makoto KIKUCHI et al: "The Loss of Driving Force due to Volume Diffusion Ahead of a Migrating Boundary in a Cellular Precipitation Reaction" Acta Metallurgica.

    • Related Report
      1989 Annual Research Report
  • [Publications] 梶原正憲 他: 耐熱金属材料委員会研究報告. 29. 287-315 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] M.Kikuchi etal.: Metallurgieal Transactions A. 19A. 645-650 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] M.Kajihara;etal.: Tokyo Inst.Tech.-Harbin Inst,Tech.Symposium on Mateirals Science. 12-13 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] M.Kajihara etal.: Phase Transformations '87. 265-268 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] M.Kawase;etal.: Phase Transformation '87. 254-257 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] M.Kikuchi;etal.: Abstract of International Conference on High Nitrogen Steels. 2.C.1 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Masanori KAJIHARA;Si-Kyung CHOI;Makoto KIKUCHI: Abstracts of Phase Transformations'87. 75 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] M.Kawase;H.Emoto;M.Kikuchi: Abstracts of Transformations'87. 72 (1987)

    • Related Report
      1987 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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