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Thermodynamic Analysis on Microstructural Control of Ordered Phases in Nickel-base Superalloys

镍基高温合金有序相微观结构控制的热力学分析

基本信息

批准号：
63550519
负责人：
ISHIDA Kiyohito
金额：
$ 1.28万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550519/
关键词：
Phase equilibria High-temperature alloy Ll_2 structure B2 structure Ordered phase Thermodynamics Ni-base superalloy Phase diagram Ll_2構造 B_2構造 L1_2構造

项目摘要

The gamma (disordered fcc) and gamma' (ordered Ll_2 structure) phases are major constitutions in the Ni-base superalloys, while beta (ordered B2 structure) phase is used for surface coating. In spite of practical importance, however, the effect of alloying elements on the relative stability between gamma, gamma' and beta phases bas not been well established. The purpose of the present study is to clarify the partition behavior of alloying elements between gamma, gamma' and beta phases. Thermodynamic analysis of phase equilibria was also done by using regular solution approximation of gamma phase and sublattice model for gamma' and beta phases. The results obtained are as follows.1. The phase equilibria of gamma, gamma' and beta phases in the Ni-Al-X (X: Si, Ti, V, Cr, Mn, Fe, Co, Cu, Nb, Mo, Ta, W) systems were accurately determined between 700 and 1300ﾟC. 2. The partition behavior of alloying elements can be classified into 6 categories. 3. The gamma phase is stabilized by alloying of Cu, Co, Fe and Cr, while Mo, W, V, Ti, Nb, Ta and Si stabilize gamma' phase and Mn stabilizes beta phase. 4. The Gibbs energy of ordered gamma' and beta phases can be well described by the sublattice model. 5. The thermodynamic parameters in the gamma, gamma' and beta phases were evaluated. 6. The phase equilibria of Ni-Al-Fe, Ni-Al-Ti, Ni-Al-Cr and Ni-Al-Mn systems are computed in the Ni-rich portions, which would be most useful for the design of microstructures in the Ni-base superalloys.

γ相（无序fcc结构）和γ '相（有序L1_2结构）是镍基高温合金的主要相组成，β相（有序B2结构）是镍基高温合金的表面涂层相。然而，尽管合金元素对γ、γ ′和β相之间的相对稳定性的影响具有实际的重要性，但还没有得到很好的证实。本研究的目的是阐明合金元素在γ、γ '和β相之间的分配行为。用γ相的正规溶液近似和γ '相和β相的亚晶格模型对相平衡进行了热力学分析。研究结果如下：1.在700 ~ 1300 ℃范围内精确测定了Ni-Al-X（X：Si，Ti，V，Cr，Mn，Fe，Co，Cu，Nb，Mo，Ta，W）系中γ，γ '和β相的相平衡。2.合金元素的分配行为可分为6类。3.通过Cu、Co、Fe和Cr的合金化稳定γ相，而Mo、W、V、Ti、Nb、Ta和Si稳定γ '相，Mn稳定β相。4.有序γ '相和β相的吉布斯自由能可用亚点阵模型来描述。5.计算了γ、γ '和β相的热力学参数。6.计算了Ni-Al-Fe、Ni-Al-Ti、Ni-Al-Cr和Ni-Al-Mn系在富Ni区的相平衡，为镍基高温合金的组织设计提供了依据。