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UNDERCOOLING AND HETEROGENEOUS NUCLEATION IN IRON-NIOBIUM AND NICKEL-NIOBIUM ALLOYS

Research Project

Project/Area Number 15560637
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Metal making engineering
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

MASAYUKI Kudoh  HOKKAIDO UNIVERSITY, GRADUATE SCHOOL OF ENGINEERING, PROFESSOR, 大学院・工学研究科, 教授 (00001248)

Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2004: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2003: ¥2,400,000 (Direct Cost: ¥2,400,000)
KeywordsUNDERCOOLING / SUBSTRATE / IORN-NIOBIUM ALLOY / NICKEL-NIOBIUM ALLOY / CARBIDE / NUCLEATION / DENDRITE / GRAIN STRUCTURE / 凝固 / 異質核生成 / 酸化物 / アルミナるつぼ / ガラススラグ法
Research Abstract

The effects of heterogeneous substances on undercooling and solidified microstructure were investigated for Iron-niobium and Nickel-niobium binary alloys. An alumina crucible and a crucible covered with commercial glass were used in this experiment. The samples were kept for 1 hr after heating up to 1823K in the Fe-Nb alloy and 1173K in the Ni-Nb alloy and quenched at 1723K and 1673K, respectively, to keep microstructures just after solidification. The experiment on the ternary alloys made by adding 1mass% carbon to the binary alloys was also done. The results obtained are summarized as follows.
(1)The undercooling of the Fe-Nb and Ni-Nb alloys increased and reached to 15K at 2mass%Nb and 80K at 1mass%Nb, respectively. The undercooling of both alloys decreases with increasing Nb concentration. The under cooling of the Ni-Nb alloy is always larger than that of the Fe-Nb alloy. (2)When the glass covered crucible was used, the undercooling became larger and it reached to 120K in the case of Ni-Nb alloy. (3)The undercooling of the ternary alloys became lower than those of binary alloy because of carbide formation. The undercooling in the ternary alloys decreased even if glass covered crucible was used. (4)The formation process from dendrite morphology to grain structure was different from the solvent of the alloy. That is, the grain formation in the Ni-base and dendrite formation in the Fe-base alloys are easy to occur. It is concluded that crucible wall mostly acts as heterogeneous materials and subsequently the oxide or carbide formed in the melt also acts as the heterogeneous substances. In addition, the undercooling of the Ni-base alloy was always larger than that of Fe-base alloys because Fe oxide is easy to form compared with Ni oxide.

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (6 results)

All 2005 2004

All Journal Article (6 results)

  • [Journal Article] Solidification Behavior of Fe-Nb and Fe-C-Nb Alloys2005

    • Author(s)
      Masayuki Kudoh, Masataka Tezuka, Kiyotaka Matsuura
    • Journal Title

      Materials Science Forum 475-479

      Pages: 2567-2570

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] SOLIDIFICATION BEHAVIOR OF Fe-Nb and Ni-Nb ALLOYS2005

    • Author(s)
      MASAYUKI KUDOH, MASATAKA TEZUKA, KIYOTAKA MATSUURA
    • Journal Title

      MATERIALS SCIENCE FORUM 475-479

      Pages: 2567-2570

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Solidification Behavior of Fe-Nb and Fe-C-Nb Alloys2005

    • Author(s)
      Masayuki Kudoh
    • Journal Title

      Materials Science Forum 475-479

      Pages: 2567-2570

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Possibility of Fine γ Grain Formation in Steel Solidification2004

    • Author(s)
      Masayuki Kudoh, Kiyotaka Matsuura, Masataka Tezuka
    • Journal Title

      The Tenth Japan-China Symposium on Science and Technology of Iron and Steel

      Pages: 214-221

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] POSSIBILITY OF FINE γ GRAIN FORMATION IN STEEL SOLIDIFICATION2004

    • Author(s)
      MASAYUKI KUDOH, KIYOTAKA MATSUURA, MASATAKA TEZUKA
    • Journal Title

      THE 10^<th> JAPAN-CHINA SYMPOSIUM ON SCIENCE AND TECHNOLOGY OF IRON AND STEEL

      Pages: 214-221

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Possibility of Fine γ Grain Formation in Steel Solidification2004

    • Author(s)
      Masayuki Kudoh
    • Journal Title

      The Tenth Japan-China Symposium on Science and Technology of Iron and Steel

      Pages: 214-221

    • Related Report
      2004 Annual Research Report

URL: 

Published: 2003-04-01   Modified: 2016-04-21  

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