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Thermo-mechanisch hergestelltes, mehrphasiges Kugelgraphitgusseisen

热机械制造的多相球墨铸铁

基本信息

批准号：
202322611
负责人：
Professor Dr.-Ing. Heinz Palkowski
金额：
--
依托单位：
Institut für Metallurgie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2011
资助国家：
德国
起止时间：
2010-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/202322611?language=en
关键词：
Thermo mechanisch hergestelltes mehrphasiges Kugelgraphitgusseisen

项目摘要

In this project, a new processing method is proposed to investigate the possibility to improve the strength and elongation of ductile iron (DI) by grain refinement of parent austenite using multipass deformation before slow cooling in the two phase ferrite+austenite region to various quenching temperatures (TQ). The aim is to obtain different ferrite to austenite ratios. The material is subsequently to be quenched from the two phase region either to room temperature, to obtain a martensite + ferrite matrix, or to austempering temperature to obtain a ferrite + ausferrite + retained austenite matrix. In one process-chain, the suggested processing method combines two processes reported to improve the excellent combination and range of mechanical properties of ductile irons namely, thermomechanical processing and production of dual matrix structure (DMS). Such a processing-method would find its application in the wide-spread field of hot strip rolling mills, using controlled rolling and cooling technologies. Application of this technology helps to manage the kinetics of various metallurgical processes, like austenite formation, recrystallization and austenite decomposition behaviours. Multiphase steels such as hot rolled dual phase steel (DP-steel), TRIPsteel and complex phase steel (CP-steel) are examples of products from such rolling mills. It is planned to transfer the preceding technology, already used for steel, to produce multi-phase flat rolled ductile-iron for the use in applications requiring high toughness, particularly for automotive industry.

本研究提出了一种新的工艺方法，即在铁素体+奥氏体两相区缓慢冷却到不同的淬火温度（TQ）之前，采用多道次变形细化原始奥氏体晶粒，以提高球墨铸铁（DI）的强度和延伸率。目的是获得不同的铁素体与奥氏体的比率。随后将材料从两相区淬火至室温以获得马氏体+铁素体基体，或淬火至等温淬火温度以获得铁素体+奥氏铁素体+残留奥氏体基体。在一个过程链中，建议的处理方法结合了两个过程，报告，以改善优良的组合和范围的球墨铸铁的机械性能，即，热机械加工和生产的双矩阵结构（DMS）。这种处理方法将在广泛的热带轧制米尔斯领域中找到其应用，使用控制轧制和冷却技术。该技术的应用有助于管理各种冶金过程的动力学，如奥氏体形成、再结晶和奥氏体分解行为。多相钢例如热轧双相钢（DP-钢）、TRIP钢和复相钢（CP-钢）是来自这种轧制米尔斯的产品的实例。计划转让已用于钢的上述技术，以生产多相平轧球墨铸铁，用于要求高韧性的应用，特别是汽车工业。