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首页> 外文期刊>Materialpruefung: Werkstoffe und Bauteile, Forschung Prufung Anwendung >Production-and microstructure-based fatigue assessment of metallic AISI 304/430 multilayer materials produced by hot pack rolling
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Production-and microstructure-based fatigue assessment of metallic AISI 304/430 multilayer materials produced by hot pack rolling

机译：金属AISI的生产和微观结构的疲劳评估304/430热包装轧制生产的多层材料

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摘要

Metallic multilayer materials consisting of hundreds or thousands of layers offer a high potential for broad applications in modern technology. A uniform and gradual thinning of layers can be realized by using alloys with different crystal structures in combination with the efficient and high-performance technology of hot pack rolling. However, investigations on fatigue properties, especially to evaluate the influence of the number of layers, are still missing. In the present study, the fatigue behavior of metallic multilayer materials consisting of austenitic and ferritic stainless steels AISI 304 and AISI 430 with 100 and 1400 layers are characterized by applying a time-efficient load increase procedure. Therefore, instrumented stepwise load increase tests were performed to define suitable loading parameters for a convenient comparison of fatigue properties in constant amplitude tests. A benefit of the complex production process leading to 1400 layers was verified concerning the investigated load level in the range of low cycle fatigue with a significant improvement by the factor of 3.5. The alternating current potential drop method for measurements of change in voltage was determined to be most suitable to detect microstructural changes at an early state of fatigue damage for multilayer materials. Microstructures as well as fractured surfaces were investigated using light and scanning electron microscopy to evaluate the results of the two technological manufacturing routes as well as the crack and failure behavior.
机译：由数百或数千层组成的金属多层材料提供了现代技术广泛应用的高潜力。通过使用具有不同晶体结构的合金与热包装轧制的有效和高性能技术相结合，可以实现层的均匀和逐渐变薄。然而，对疲劳性能的调查，特别是评估层数的影响，仍然缺失。在本研究中，通过使用100和1400层组成的金属多层材料由奥氏体和铁素体不锈钢AISI 304和AISI 430组成的金属多层材料的疲劳性能通过施加时间有效的负载增加程序来表征。因此，进行仪表逐步负荷增加试验以定义合适的负载参数，以便在恒定幅度测试中的疲劳性能进行方便的比较。在低循环疲劳范围内验证了导致1400层的复杂生产过程的益处，其在低循环疲劳范围内具有显着提高3.5。确定用于测量电压变化的交流电位液位方法是最适合于以多层材料疲劳损伤的早期检测微观结构变化。使用光和扫描电子显微镜研究了微观结构以及裂缝表面，以评估两种技术制造路线以及裂缝和故障行为的结果。

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