Effect of Intercritical Annealing on Phase Transformation and Mechanical Properties of Thermo‐Mechanically Processed Dual Matrix Ductile Iron

Effect of Intercritical Annealing on Phase Transformation and Mechanical Properties of Thermo‐Mechanically Processed Dual Matrix Ductile Iron
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临界退火对热机加工双基体球墨铸铁相变和力学性能的影响

DOI:
10.1007/978-3-319-48237-8_113
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通讯作者:
Palkowski H.
Palkowski H.
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作者:
Soliman;Ibrahim;Nofal A;Palkowski H.

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球墨铸铁中的双基体组织(DMS)是一种新型材料,其基体组织由软的铁素体相和硬的奥氏体铁素体/马氏体相组成。含DMS的球墨铸铁由于强度和延展性的改善而受到关注。在本文中,DMS产生在热机械加工的球墨铸铁。在奥氏体化之后,材料经受两个变形步骤,随后在临界区内的温度下等温保持,以便将一定量的奥氏体转变成铁素体。随后将试样淬火至室温以获得马氏体+铁素体组织。研究了铁素体含量对组织发展和力学性能的影响,并与完全马氏体基体的铁素体含量进行了比较。
Dual matrix structure (DMS) in ductile cast iron is a new class of materials in which the matrix structure consists of the soft ferrite phase and the hard ausferrite/martensite phase. The ductile iron with DMS gains interest due to the improved combination between strength and ductility. In this paper, DMS is produced in thermo-mechanically processed ductile iron. After austenitization the material is subjected to two deformation steps followed by an isothermal holding at temperatures within the intercritical region, so as to transform a certain amount of austenite into ferrite. The specimens are subsequently quenched to room temperature to obtain martensite+ferrite structure. The influence of the ferrite content on the structure development and mechanical properties are investigated and compared to those with a completely martensitic matrix.
马氏体体积分数和回火时间对(α+γ)温度范围部分奥氏体化及调质铁素体球墨铸铁拉伸性能的影响
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