Creep strengthening and weakening mechanisms by martensite lath in high Cr ferritic heat-resistant steel

高铬铁素体耐热钢中马氏体板条的蠕变强化和弱化机制

• 批准号: 24760576
• 负责人: MITSUHARA Masatoshi
• 金额: $ 2.91万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-24760576/
• 关键词: フェライト系耐熱鋼; クリープ変形; 強化機構; ラスマルテンサイト; 転位; 粒界上析出物; 電子顕微鏡; 結晶方位解析; 高Crフェライト系耐熱鋼

In this study, we clarified creep strengthening and weakening mechanisms by martensite lath structure in high Cr ferritic heat resistant steel. Firstly, the interaction of dislocations and lath boundaries were observed with in-situ tensile test in high-voltage transmission electron microscope. Then, lath structure coarsening behavior during creep deformation was evaluated by the crystal orientation analysis. From these results, we concluded that lath structure is a dominant factor of creep strength in high Cr ferritic heat resistant steel. In addition, in order to understand the mechanism of improvement of lath structure stability by precipitates formed on grain boundary, the size and the density of precipitates on each grain boundary were estimated using the microstructural observation. Those parameters of precipitates obviously depended on the grain boundary character.

本文阐明了高铬铁素体耐热钢中马氏体板条组织的蠕变强化和弱化机制。首先，利用高压透射电镜原位拉伸实验观察了位错与板条界的相互作用。通过晶体取向分析，研究了蠕变过程中板条组织的粗化行为。结果表明，板条组织是影响高铬铁素体耐热钢蠕变强度的主要因素。另外，为了理解晶界析出物提高板条组织稳定性的机理，通过显微组织观察，对各晶界析出物的尺寸和密度进行了估算。析出相的这些参数明显地取决于晶界特征。

项目成果

高Crフェライト系耐熱鋼のクリープ強度に対するラス境界の役割

板条晶界对高铬铁素体耐热钢蠕变强度的影响

• 发表时间: 2013
• 期刊: 耐熱金属材料第123委員会研究報告
• 作者: H. Iwase;K. Akutsu;N. K. Kawano;A. Ebihara;T. Yoshimura;Hiroki Iwase;光原昌寿
• 通讯作者: 光原昌寿

An overview of micro/nano-structure and the creep property relationship of high-Cr heat resistant steels

高铬耐热钢微纳米结构与蠕变性能关系综述

• 发表时间: 2014
• 作者: N. Endo;H. Saitoh;A. Machida;Y. Katayama;M. Mitsuhara
• 通讯作者: M. Mitsuhara

Interaction between Dislocation and Lath Boundaries during High Temperature Deformation in 9Cr Heat-Resistant Steel

9Cr耐热钢高温变形过程中位错与板条边界的相互作用

• 发表时间: 2014
• 作者: M. Mitsuhara;M. Miake;S. Yamasaki;H. Nakashima;N. Nishida;J. Kusumoto;A. Kanaya
• 通讯作者: A. Kanaya

Effect of Lath Boundary on Creep Strengthening in 9Cr Hear-Resistant Steel

板条边界对9Cr耐热钢蠕变强化的影响

• 发表时间: 2013
• 作者: Masatoshi Mitsuhara;Masaki Miake;Shigeto Yamasaki;Hideharu Nakashima;Ninoru Nishida;Jun-ichi Kusumoto;Akihiro Kanaya
• 通讯作者: Akihiro Kanaya

Interaction between Dislocations and Lath Boundaries during High Temperature Deformation in 9Cr Heat-Resistant Steel

9Cr耐热钢高温变形过程中位错与板条边界的相互作用

• 发表时间: 2014
• 作者: Masatoshi Mitsuhara;Masaki Miake;Shigeto Yamasaki;Satoshi Hata;Hideharu Nakashima;Ninoru Nishida;Jun-ichi Kusumoto;Akihiro Kanaya
• 通讯作者: Akihiro Kanaya