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Microstructure- and mechanism-correlated characterization of the corrosion fatigue behavior of the creep-resistant magnesium alloys DieMag422 and AE42

抗蠕变镁合金 DieMag422 和 AE42 腐蚀疲劳行为的微观结构和机理相关表征

基本信息

批准号：
258700985
负责人：
Professor Dr.-Ing. Frank Walther
金额：
--
依托单位：
Lehrstuhl für Werkstoffprüftechnik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2014
资助国家：
德国
起止时间：
2013-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/258700985?language=en
关键词：
Microstructure mechanism correlated characterization corrosion

项目摘要

For a safe and efficient use of magnesium alloys in industrial applications, particularly in automotive industry, a high creep and fatigue strength with a sufficient corrosion resistance is necessary. Materials, used e.g. for gearboxes and crankcases, have to withstand loadings at temperatures of up to 200 °C. The creep resistance can be improved by the addition of particular alloying elements which causes a precipitation of intermetallic phases. However, these alloying elements form micro-galvanic cells in the material which can result in a decrease of the corrosion resistance of magnesium alloys. These corrosive stresses, in turn, reduce the lifetime under cyclic loadings. Therefore, the interdependency between chemical composition, creep resistance, corrosion resistance and fatigue strength has to be known to improve material and component properties. For a reliable design and lifetime calculation of magnesium components, both corrosive and cyclic loadings have to be considered to evaluate the influence of these simultaneous loadings on the material properties mechanism-oriented. Current studies deal with the influence of corrosion on the fatigue behavior, but there are no application-optimized and especially time- and cost-efficient testing concepts provided.In the proposed research project, the influence of corrosion on the fatigue behavior will be investigated in-situ using two creep-resistant magnesium alloys DieMag422 und AE42. For a comparative characterization of the corrosion fatigue behavior, a new testing strategy is applied which provides detailed information by using an application-optimized physical and electrochemical sensor system and microstructural investigations with an economical number of tests. The obtained results will be used for the development of a model-based correlation interpreting the corrosion-microstructure-property-relationship quantitatively and qualitatively. Based on the corrosion and fatigue behavior, the model will be used to reliably estimate the fatigue strength and lifetime performance taking into account the corrosive loadings.

为了在工业应用中安全有效地使用镁合金，特别是在汽车工业中，需要具有足够耐腐蚀性的高蠕变和疲劳强度。用于齿轮箱和曲轴箱的材料必须承受高达200 °C的温度下的载荷。抗蠕变性可以通过添加引起金属间相沉淀的特定合金元素来改善。然而，这些合金元素在材料中形成微原电池，这可能导致镁合金的耐腐蚀性降低。这些腐蚀应力又降低了循环载荷下的寿命。因此，必须了解化学成分、抗蠕变性、抗腐蚀性和疲劳强度之间的相互关系，以改善材料和部件性能。为了对镁合金构件进行可靠的设计和寿命计算，必须同时考虑腐蚀载荷和循环载荷，从机理上评估这两种载荷对材料性能的影响。目前的研究涉及腐蚀对疲劳行为的影响，但没有应用优化，特别是时间和成本效益的测试概念provided.In拟议的研究项目，腐蚀对疲劳行为的影响将在现场使用两个抗蠕变镁合金DieMag422和AE42。对于腐蚀疲劳行为的比较表征，一种新的测试策略，它提供了详细的信息，通过使用应用优化的物理和电化学传感器系统和微观结构的调查与经济数量的测试。所获得的结果将用于开发一个基于模型的相关性解释的腐蚀微观结构性能的关系定量和定性。基于腐蚀和疲劳行为，该模型将用于可靠地估计考虑腐蚀载荷的疲劳强度和寿命性能。