Alloy Design for Austenitic Heat-resisting Steels Strengthened by Intermetallic Compounds

金属间化合物强化奥氏体耐热钢的合金设计

• 批准号: 14205102
• 负责人: TAKEYAMA Masao
• 金额: $ 30.78万
• 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 (A)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14205102/
• 关键词: C14 structure; C15 structure; DO_<22>structure; Lattice Parameters; Lattice misfit; Phase equilibria; Precipitation morphology; Microstructure control; 遷移包析型反応; 置換サイト; c; a比; 形態制御; 軸比; 大きさ効果; chessboard組織; 整合; オーステナイト; 金属間化合物; 相変態; 析出

This research has focused on the phase equilibria, phase transformations and precipitation behavior of TCP and GCP compounds in Fe-Ni-M(M : transition metals) ternary systems at elevated temperatures, in order to get insight into a new concept for alloy development of austenitic heat resisting steels strengthened by intermetallic phases. As strengthening species, Fe_2Nb Laves(TCP) and Ni_3V(GCP) phases are used.Among Fe-Ni-M ternary systems, Fe_2Nb with C14 crystal structure has an extended composition homogeneity region and it can be in equilibrium with γ-Fe phase (Al). For example, Ni atoms can substitute for more than a half of Fe sublattice, and Zr atoms for twp-third of the Nb sublattice sites. Thus, solid solution alloying controls the lattice parameters of C14 structure, and the Laves phase can homogeneously precipitates in the γ matrix when its lattice parameter ratio (c/a) becomes 1.633. Based on these findings, we proposed a model Fe-Ni-Cr-Nb alloy.The Ni_3V with DO_<22> structure quenched from the high-temperature disordered Al (fcc) phase region consists of an unique multi-variant structure (MVS) with two habits planes of {010}と{101} due to its tetragonality (a_<DO22><a_<Al><c_<DO22>). We identified the formation mechanism and its composition region of MVS. The morphology of the Al/DO_<22> two-phase MVS can be intentionally changed to either "Maze" or "Chessboard", by controlling the misfit. We extended these findings to multi-component system by substituting Ni with Fe and V with Nb, and showed ways to develop austenitic steels strengthened by the intermetallic phases.

本文研究了Fe-Ni-M(M：过渡金属)三元系中TcP和GCP化合物在高温下的相平衡、相变和析出行为，以期为金属间化合物强化奥氏体耐热钢的合金化发展提供新的思路。在Fe-Ni-M三元系统中，具有C14晶体结构的Fe2Nb具有较宽的成分均匀区，并可与γ-Fe相(Al)平衡。例如，Ni原子可以替代一半以上的Fe亚晶格，而Zr原子可以替代三分之二的Nb亚晶格位置。因此，固溶体合金化控制了C14结构的晶格参数，当其晶格参数比(c/a)为1.633时，Laves相在γ中均匀析出。在此基础上，我们提出了一种Fe-Ni-Cr-Nb合金模型。由于其四方性(a_&lt；DO22&gt；&lt；a_&lt；Al&gt；&lt；c_&lt；DO22&gt；).，从高温无序Al(Fcc)相区淬火的具有do；22和gt；结构的Ni_3V由独特的多变量结构组成，具有两个习惯面：{010}と{101确定了MVS的形成机制及其组成区域。通过控制失配，Al/DO&lt；22&gt；两相MVS的形态可以有意地改变为“迷宫”或“棋盘”。将这些结果推广到多元系统，用Fe代替Ni，用Nb代替V，并指出了开发金属间化合物相强化奥氏体钢的途径。

项目成果

Fe-Mo-Ni3元系の1173Kにおけるα-Fe(A2),γ-Fe(Al),λ-Fe_2Mo(C14)相間の相平衡

Fe-Mo-Ni三元体系中1173K时α-Fe(A2)、γ-Fe(Al)和λ-Fe_2Mo(C14)相之间的相平衡

• 发表时间: 2005
• 期刊: 学振 耐熱金属材料第123委員会 研究報告 46-1
• 作者: 石川茂浩

鈴木茜, 竹山雅夫, 松尾孝: "Ni_3VのMulti-variant組織におけるvariantの選択成長による粗大化機構"第131回日本金属学会講演概要. 131. 160 (2002)

Akane Suzuki、Masao Takeyama、Takashi Matsuo：“Ni_3V 多变体结构中变体的选择性生长导致的粗化机制”第 131 届日本金属学会演讲摘要。

Phase Equilibria and Lattice Parameters of Fe 2 Nb Laves Phase in Fe-Ni-Nb Ternary System at Elevated Temperatures

• DOI: 10.1557/proc-842-s5.37
• 发表时间: 2004
• 期刊: MRS Proceedings
• 作者: M. Takeyama;Nobuyuki Gomi;S. Morita;T. Matsuo

Fe-Ni-Nb 3元素におけるγ-Fe/Fe_2Nb相間の相平衡とFe_2Nb相の結晶構造

Fe-Ni-Nb三元素中γ-Fe/Fe_2Nb相的相平衡及Fe_2Nb相的晶体结构

• 发表时间: 2004
• 期刊: (独)日本学術振興会 耐熱金属材料 第123委員会研究報告 45-2
• 作者: 五味伸幸;竹山雅夫
• 通讯作者: 竹山雅夫

Possible Development of Austenitic Heat Resisting Steels Strengthened by Intermetallic, Report on the 123^<rd> Committee on Heat-Resisting Materials and Alloys.

金属间化合物强化奥氏体耐热钢的可能发展，第 123 届耐热材料和合金委员会报告。

• 发表时间: 2004
• 期刊: Japan Society for the Promotion of Science 45-1
• 作者: M.Takeyama;N.Gomi;T.Matsuo
• 通讯作者: T.Matsuo