Interphase-boundary structures and mechanical properties of two-phase ( / ) stainless steel bicrystals

两相（ / ）不锈钢双晶的相界结构和力学性能

• 批准号: 62550475
• 负责人: MIURA Sei
• 金额: $ 0.19万
• 依托单位: Kyoto 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: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62550475/
• 关键词: Two-phase stainless steel; Multi-phase material; Interface; Bicrystal; Kurdjumov-Sachs orientation relationship; Diffusion bonding; Mechanical property; 異相界面; Kurdjunov-Sachs関係; 異相双結晶; 拡散相変態; γ; αステンレス鋼双結晶; FCC; BCC相界面構造; 拡散誘起双晶; Two-phase stainless steel; Multi-phase material; Interface; Bicrystal; Kurdjumov-Sachs orientation relationship; Diffusion bonding; Mechanical property; 異相界面; Kurdjunov-Sachs関係; 異相双結晶; 拡散相変態; γ; αステンレス鋼双結晶; FCC; BCC相界面構造; 拡散誘起双晶

The morphology of two-phase ( / ) stainless steel couples, starting from Fe- 30Cr( -phase) and Fe-15Cr-15Ni( -phase) alloys produced by a solid-solid diffusion method has been investigated. Macroscopic units made of single crystals of the - and - phases (two-phase bicrystals) could be obtained. Interphase boundaries between a parent -phase and a transformed -phase have been found to be essentially planar and no special structual defects have been detected, excepting a so-called diffusion-induced twin faults grown often in the -phase due to the inevitable concentration gradient adjacent to the interphase boundary.It is found that the transformed ( _n)-phase generally inherits the crystallographic orien-tation of the original ( _o)-phase in a similar manner to "Grain growth", when the initial bonding orientation relation is arbitrary. However, if the bonding orientation relation is set to be a near Kurjumov-Sachs relation which is a well-known preferential orientation relation between precipitate and matrix in this system, nucleation of the phase transformation ( ) occurs and the resulting orientation relations become closer to the preferential one. These facts mean that the critical condition for the occurrence of the "nucleation" may be attributable to the interfacial erergy criterion on the ( / )-interphase boundary and the grain-boundary between the _o - and _n - phases.Study to reveal the relationship between structures and sliding behavior of the interphase boundary in two-phase ( / ) stainless steel bicrystals are in progress.

已经研究了由Fe-30CR（-phase）和Fe-15Cr-15NI（ - 相）合金（通过固醇扩散方法产生的）从Fe-30CR（ - 相）和Fe-15Cr-15ni（ - 相）合金开始的两相（ /）不锈钢夫妇的形态。可以获得由 - 和 - 相（两相双晶）制成的宏观单元。已经发现，父母 - 相和转变的相之间的相互之间的边界本质上是平面的，没有检测到特殊的结构缺陷，除了经常在 - 相位中经常在 - 相位中经常成长的所谓扩散诱导的双断层，这是由于不可避免的浓度梯度毗邻，因此发现了相互构造的一般属性。当初始键合方向关系是任意的时，_o） - 以类似的方式相似。但是，如果将键合方向关系设置为近乎库朱莫夫 - sachs的关系，该关系是该系统中沉淀和基质之间众所周知的优先取向关系，则发生相变的成核（），并且产生的方向关系变得更接近优惠。这些事实意味着，发生“成核”的临界条件可能归因于（ /） - 间相边界上的界面阶层标准，以及_o和_n-阶段之间的晶粒构建。