Acta Metallurgica Sinica (English Letters) ›› 2011, Vol. 24 ›› Issue (5): 365-372.DOI: 10.11890/1006-7191-115-365

• 研究论文 • 上一篇    下一篇

Preparation of Ni-W-10Y2O3 refiner and refinement mechanism in a superalloy

姜卫国1,杨明川1,楼琅洪2,侯凤华3,3,胡壮麒4   

  1. 1. 中国科学院金属研究所
    2. 中科院金属所
    3.
    4. 中国科学院金属研究所高温合金部
  • 收稿日期:2010-12-13 修回日期:2011-03-04 出版日期:2011-10-25 发布日期:2011-10-18
  • 通讯作者: 姜卫国

Preparation of Ni-W-10Y2O3 refiner and refinement mechanism in a superalloy

Weiguo JIANG, Mingchuan YANG, Langhong LOU, Fenghua HOU，Zhuangqi HU   

  1. Institute of Metal Research, Chinese Academy of  Sciences, Shenyang 110016,  China
  • Received:2010-12-13 Revised:2011-03-04 Online:2011-10-25 Published:2011-10-18
  • Contact: WeiguoJIANG

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摘要： A novel grain refiner composed of nickel, tungsten and yttria was prepared by powder metallurgy way. The microstructure of the refiner alloy was studied by optical microscope (OM), scanning electronic microscope (SEM) and energy dispersive spectroscope (EDS). The refinement process was simplized and the casting thermal parameter was controlled easily by direct addition of the refiner into the melt experimental alloy. It was shown that the alloy grain could be refined by addition of refiner apparently even at high pouring temperature. The average grain size of the refiner free alloy was 4mm, while it was only 0.4mm in the refined alloy. The fine-grain superalloy has excellent mechanical properties at intermediate temperature. At last, the refinement mechanism was discussed.

Abstract: A novel grain refiner composed of nickel, tungsten and yttria was prepared by the powder metallurgy way. The microstructure of the refiner alloy was studied by optical microscope (OM), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). The refinement process was simplized. It was shown that the alloy grains could be refined by addition of the refiners apparently even at high pouring temperature. The average grain size of the refiner free alloy was 4~mm, and 0.4 mm for the refined alloy. The fine-grain superalloy has excellent mechanical properties at intermediate temperature. The refinement mechanism was discussed.

Key words: Superalloy, Refiner, Grain refinement, Microstructure