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Optimization of the fatigue behavior of TWIP steels through monotonic pre-straining

通过单调预应变优化 TWIP 钢的疲劳行为

基本信息

批准号：
191212885
负责人：
Professor Dr.-Ing. Thomas Niendorf
金额：
--
依托单位：
Fachgebiet Metallische Werkstoffe
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/191212885?language=en
关键词：
Optimization fatigue behavior TWIP steels

项目摘要

The development of light-weight structures featuring high specific strength is in focus of industrial and academic research. Due to the combination of high strength and extraordinary ductility TWIP-steels (TWinning Induced Plasticity) are a promising candidate for light-weight design. In these steels twinning can be observed already at low degrees of deformation leading to delayed necking due to dynamic Hall-Petch effect. Using TWIP steels weight reduction of the body in white, eventually decreasing the energy consumption, can be achieved. High crash performance is another essential factor qualifying materials for automotive applications. This and other important aspects such as drawability and the feasibility of cold working at high remaining ductility are met by the TWIP steels, as well.However, the basic understanding of the deformation behavior of TWIP-steels induced by the interaction of different microstructural features under variable operating conditions, i.e. monotonic and cyclic loading at different temperatures, is not sufficient. The active deformation mechanism, determined through the stacking fault energy (SFE), is the key parameter for evaluating the nature of deformation. The possible mechanisms in the high manganese steels are TRIP (TRansformation Induced Plasticity), TWIP and/or slip.In line with the investigations conducted so far and based on the results currently available, the continuation of this research project is aiming at deepening the understanding of the deformation mechanisms active in the TWIP-steels and their interactions especially at different temperatures. A thorough test program will be employed in order to characterize the mechanical property - microstructure relationships under cyclic loading at different temperatures and in different microstructural conditions.

高比强度轻量化结构的发展是工业和学术界研究的热点。由于twip钢的高强度和非凡的延展性，twip钢（孪生诱导塑性）是轻量化设计的一个有前途的候选人。在这些钢中，由于动态霍尔-佩奇效应，在低变形程度下已经可以观察到孪晶，导致颈缩延迟。采用TWIP钢减轻白车身重量，最终降低能耗，可以实现。高碰撞性能是汽车应用材料的另一个重要因素。TWIP钢也满足了这一点以及其他重要方面，如拉伸性和高剩余延展性冷加工的可行性。然而，对于twip钢在不同操作条件下（即不同温度下的单调加载和循环加载）由不同微观组织特征相互作用引起的变形行为的基本认识还不够充分。通过层错能（SFE）确定的主动变形机制是评价变形性质的关键参数。在高锰钢中可能的机制是TRIP（相变诱发塑性）、TWIP和/或滑移。根据迄今为止所进行的调查和目前可用的结果，该研究项目的继续旨在加深对twip钢中活跃的变形机制及其相互作用的理解，特别是在不同温度下。为了表征在不同温度和不同微观组织条件下循环加载下的力学性能-微观组织关系，将采用全面的测试程序。