In-Situ Measurement of Deformation Induced Formation of Martensite in Austempered Ductile Iron (ADI)

等温淬火球墨铸铁 (ADI) 中变形诱发马氏体形成的原位测量

• 批准号: 233737539
• 负责人: Professor Dr. Winfried Petry
• 金额: --
• 依托单位: Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/233737539?language=en
• 关键词: Situ; Measurement; Deformation; Induced; Formation

Austempered Ductile Iron (ADI) is a cast iron material which is heat-treated in a multistage process. Thus a microstructure called ausferrite forms, consisting of metastable retained austenite, ferrite sheaves and spheroidal graphite. This microstructure is the reason for the excellent mechanical properties of ADI compared to the initial state. From TRIP-steels, which are used in sheet metal forming processes, it is known that metastable retained austenite can transform to martensite under external loads.Based on the results of the DFG research project the phase transformation kinetics of selected ADI-materials during the heat treatment will be investigated in-situ using neutron diffraction. The phase compositions and the carbon contents of the retained austenite will be determined together with the microstructures and mechanical material properties depending on the respective heat treatment parameters.The formation of martensite in heat-treated specimens will be measured in-situ using neutron diffraction during tension and compression tests. The experimental data will be used for testing existing mathematical models for calculation of stress and strain-induced formation of martensite in TRIP-steels. These models will be validated and extended so that they can be used for ADI.

奥贝球铁（ADI）是一种铸铁材料，在多阶段过程中进行热处理。这样就形成了由亚稳残余奥氏体、铁素体层和球状石墨组成的奥氏体铁素体显微组织。这种显微组织是ADI与初始状态相比具有优异机械性能的原因。从TRIP钢，这是用于金属板材成形过程中，它是已知的，亚稳态残余奥氏体可以转变为马氏体在外部负载下。根据DFG研究项目的结果，选定的ADI材料在热处理过程中的相变动力学将使用中子衍射原位研究。残余奥氏体的相组成和碳含量将根据各自的热处理参数与显微组织和材料力学性能一起确定。热处理试样中马氏体的形成将在拉伸和压缩测试过程中使用中子衍射原位测量。实验数据将用于测试现有的数学模型，用于计算TRIP钢中应力和应变诱导马氏体的形成。这些模型将被验证和扩展，以便它们可以用于ADI。

项目成果

Strain Induced Martensitic Transformation in Austempered Ductile Iron (ADI)

等温淬火球墨铸铁 (ADI) 中的应变诱导马氏体相变

• DOI: 10.1088/1742-6596/746/1/012055
• 发表时间: 2016
• 期刊: Journal of Physics: Conference Series
• 作者: Xiaohu;Patrick;Weimin;Landesberger;Martin;Hoelzel;Markus;Hofmann;Michael
• 通讯作者: Michael

In-situ measurement of phase transformation kinetics in austempered ductile iron

• DOI: 10.1016/j.matchar.2013.09.005
• 发表时间: 2013-11
• 期刊: Materials Characterization
• 影响因子: 4.7
• 作者: L. Meier;M. Hofmann;P. Saal;W. Volk;H. Hoffmann

In Situ Study of the Influence of Nickel on the Phase Transformation Kinetics in Austempered Ductile Iron

• DOI: 10.1007/s11661-015-3261-1
• 发表时间: 2016-02
• 期刊: Metallurgical and Materials Transactions A
• 作者: P. Saal;L. Meier;Xiaohu Li;M. Hofmann;M. Hoelzel;J. N. Wagner;W. Volk