INTERPHASE BOUNDARY STRUCTURE AND HABIT PLANE OF LENTICULAR MARTENSITE IN IRON-BASED ALLOYS

铁基合金中透镜状马氏体的相间晶界结构和惯态面

• 批准号: 17560617
• 负责人: MAKI Tadashi
• 金额: $ 2.37万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560617/
• 关键词: MARTENSITE; HABIT PLANE; INTERPHASE BOUNDARY STRUCTURE; LATTICE INVARIANT SHEAR; MID-RIB; 薄板状マルテンサイト; 格子不変変形; ミドリブ; レンズマルテンサイト; 鉄合金; 異相界面構造; 変態双晶; 結晶学的方位関係

In iron-based alloys, the morphology of martensite changes from lath to lenticular and thin plate with a decrease in Ms temperature. In the present study, in order to make clear the reason of martensite morphology change, substructure and crystallographic features such as habit plane, orientation relationship, interphase boundary structure, etc) were observed in detail by means of transmission electron microscopy using mainly Fe-Ni alloys. Main results obtained are as follows.1.Lenticular martensite plate consists of three parts, i.e., (1)the mid-rib which is completely twinned, (2)the twinned region in which some twins are extended from the midrib, (3)the untwined region which contains a high density of dislocations. Midrib is the region at which the transformation is initiated, and has the same morphology (thin plate) and crystallography ({3,10,15}habit plane, G-T orientation relationship) as those of thin plate martensite.2.The orientation relationship of lenticular martensite is G- … More T at the mid-rib but gradually deviates towards K-S near the M/A interface. This change is related to the change in the substructure of martensite.3.Although the interface of lenticular martensite is usually smooth in the scale of optical microscopy, it becomes irregular when the Ms temperature is increased near room temperature, and exhibits many {225}A facets. The {225}A plane corresponds to the habit plane of lath martensite.4.The interphase boundary of lenticular martensite consists of two sets of screw dislocations which accommodate transformation strain. This boundary structure is same as that of lath martensite.5.It was concluded that the change of marteniste morphology results from the change in the mode of lattice invariant shear during transformation. Martensite morphology becomes thin-plate when the twinning occurs, and the lath shape when the slip occurs. When the lattice invariant shear changes from twinning to slip during the growth, morphplogy of martensite becomes lenticular. Less

在铁基合金中，随着Ms温度的降低，马氏体相的形态由板条状转变为透镜状和薄片状。本研究主要以Fe-Ni合金为研究对象，利用透射电子显微镜详细观察了马氏体亚结构和晶界结构特征(如惯性面、取向关系、相界结构等)，以弄清马氏体形态变化的原因。主要结果如下：1.透镜马氏体片由三部分组成，即(1)完全孪生的中肋，(2)从中肋延伸出部分孪晶的孪晶区，(3)含有高密度位错的非孪晶区。中脉是相变的起始区，具有与薄片马氏体相同的形态(薄片)和晶体结构({3，10，15}习惯面，G-T取向关系)。2.透镜状马氏体的取向关系为G-…在肋骨中段T较多，但在M/A界面附近逐渐偏离K-S方向。这种变化与马氏体亚结构的变化有关。3.虽然在光学显微镜下，柱状马氏体的界面通常是光滑的，但当ms温度在室温附近升高时，它变得不规则，并呈现出许多{225}A面。{225}A面对应于板条马氏体的习惯面。4.透镜状马氏体的相界由两组适应相变应变的螺旋位错组成。这种边界结构与板条马氏体的边界结构相同。5.马氏体晶界形态的变化是相变过程中晶格不变剪切方式变化的结果。孪晶发生时，马氏体形态变为薄片状，滑移发生时，马氏体形态变为板条状。当生长过程中晶格不变剪切由孪生转变为滑移时，马氏体形态变为透镜状。较少

项目成果

The effects of tetragonality of martensite and volume change accompanying martensitic transformation on the morphology of α' martensite in iron-based alloys

马氏体四方性及马氏体相变体积变化对铁基合金α马氏体形貌的影响

• 发表时间: 2006
• 期刊: Proc. Of 3^<rd> Int. Conf. On Advanced Structural Steels
• 作者: A.Shibata;H.Shishido;H.Ogiso;T.Furuhara;T.Maki
• 通讯作者: T.Maki

The effects of tetragonality of martensite and volume change accompanying martensitic transformation on the morphology of α' martensite in iron based alloys

马氏体四方性及马氏体相变体积变化对铁基合金α马氏体形貌的影响

• 发表时间: 2006
• 期刊: Proc. of 3rd Int. Conf. on Advanced Structural Steels
• 作者: A.Shibnata;H.Shishido;H.Ogiso;T.Furuhara;T.Maki
• 通讯作者: T.Maki

The effects of tetragonality of martensite and volume change accompanying martensitic transformation on the morphology of a ' martensite in iron-based alloys

马氏体的四方性和马氏体相变引起的体积变化对铁基合金中a’马氏体形貌的影响

• 发表时间: 2006
• 期刊: Proc. of 3rd Int. Conf. on Advanced Structural Steels
• 作者: A.Shibata;H;Shishido;H.Ogiso;T.Furuhara;T.Maki
• 通讯作者: T.Maki

Local orientation change inside lenticular martensite plate in Fe–33Ni alloy

• DOI: 10.1016/j.scriptamat.2005.04.023
• 发表时间: 2005-09
• 期刊: Scripta Materialia
• 影响因子: 6
• 作者: A. Shibata;S. Morito;T. Furuhara;T. Maki

Relation between martensite morphology and volume change accompanying fcc to bcc martensitic transformation in Fe–Ni–Co alloys

• DOI: 10.1016/j.msea.2005.12.044
• 发表时间: 2006-11
• 期刊: Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
• 影响因子: 6.4
• 作者: A. Shibata;H. Yonezawa;K. Yabuuchi;S. Morito;T. Furuhara;T. Maki