Development of New Co-Base Superalloys Precipitaion Hardened by an Intermetallic Phase for Gas Turbine Application

开发用于燃气轮机的金属间相沉淀硬化新型钴基高温合金

• 批准号: 09555209
• 负责人: MISHIMA Yoshinao
• 金额: $ 6.08万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555209/
• 关键词: superalloy; Co-base alloy; alloy design; intermetallic compound; precipitation hardening; creep; high temperature strenght; ductility; E2_1型金属間化合物Co_3AIC; 金属間化合物; 材料設計; ガスタービンエンジン

Commercial Co-base superalloys are inferior in their high temperature strength and creep properties to the Ni-base superalloys because an effective strengthening phase such as gamma-prime in the latter alloys has not been found and utilized. In the present work, two phase alloys consisting of Co solid solution matrix and an intermetallic compound Co_3AlC_<0.5> are investigated for the development of a new class of precipitation strengthened Co-base superalloys. The crystal structure of the intermetallic compound resembles the L1_2, having interstitial carbon atoms in the fcc base ordered crystal structure. Critical assessment of the crystal structure of the compound by electron diffraction analyses, orientation relationships between the matrix and the compound, room to high temperature mechanical properties, and elevated temperature creep properties of the two phase alloys with various volume fraction of the intermetallic phase are examined. It is shown that the alloys with proper dispersion characteristics of the compound have comparable creep properties with commercial Ni-base superalloys and exhibit fairly good room temperature tensile ductility.

商用钴基高温合金的高温强度和蠕变性能不如镍基高温合金，因为在后者合金中还没有发现和利用有效的强化相如γ ′。本文研究了由Co固溶体基体和金属间化合物Co_3AlC_2组成的两相合金<0.5>，旨在开发一类新型的沉淀强化Co基高温合金。金属间化合物的晶体结构类似于L1_2，在fcc基有序晶体结构中具有间隙碳原子。通过电子衍射分析，基体和化合物之间的取向关系，室温至高温的机械性能，和高温蠕变性能的两相合金与各种体积分数的金属间相的化合物的晶体结构的关键评估进行检查。结果表明，具有适当弥散特性的合金具有与商用镍基高温合金相当的蠕变性能，并表现出相当好的室温拉伸塑性。

项目成果

K.Y.Hwang,Y.Kimura,S.Miura and Y.Mishima: "Mechanical Properties of Co-Base Alloys Strengthened by E2_1-Type Intermetallic Compound Co_3Al" The 3rd Pacific Rim International Conference on Advanced Materials and Processing. volume II. 2355-2360 (1998)

K.Y.Hwang、Y.Kimura、S.Miura 和 Y.Mishima：“E2_1 型金属间化合物 Co_3Al 强化钴基合金的机械性能”第三届环太平洋先进材料与加工国际会议。

Keum-Yeon Hwang, Fu-Gao wei and Yoshinao Mishima: "Crystal structure of the Perovskite-type Co_3AIC_x Intermetallic Compound" Intermetallics. 7(To be published). (1999)

Keum-Yeon Hwang、Fu-Gao wei 和 Yoshinao Mishima：“钙钛矿型 Co_3AIC_x 金属间化合物的晶体结构”金属间化合物。

Yoshinao Mishima, Keum-Yeon Hwang, Fu-Gao Wei: "Electron Diffraction Study on the Crystal Structrue of a Ternary Intermetallic Compound Co_3AIC_x" High Temperature Ordered Intermetallic Alloys VIII,Materials research Society Symposia Proceedings Vol.487,

Yoshinao Mishima，Keum-Yeon Hwang，Fu-Gao Wei：“三元金属间化合物Co_3AIC_x晶体结构的电子衍射研究”高温有序金属间合金VIII，材料研究学会研讨会论文集Vol.487，

R.Ishibashi, S.Nakamura, Y.Aono, S.Miura and Y.Mishima: "Tensile and Creep Rupture Properties of Co + Co_3AIC_<0.5> Two-Phase Alloys" High Temperature Ordered Intermetallic Alloys VIII,Materials research Society Symposia Proceedings Vol.487, Pittsburgh. 3

R.Ishibashi、S.Nakamura、Y.Aono、S.Miura 和 Y.Mishima：“Co Co_3AIC_<0.5> 两相合金的拉伸和蠕变断裂性能”高温有序金属间合金 VIII，材料研究学会研讨会论文集卷

K.Y.Hwang, Y.Kimura, S.Miura and Y.Mishima: "Mechanical Properties of Co-Base Alloys Strengthened by E2_3-Type Intermetallic Compound Co_1Al" The 3rd Pacific Rim International Conference on Advanced Materials and Processing. volume II. 2355-2360 (1998)

K.Y.Hwang、Y.Kimura、S.Miura 和 Y.Mishima：“E2_3 型金属间化合物 Co_1Al 强化钴基合金的机械性能”第三届环太平洋先进材料与加工国际会议。