Reliability of Selective Laser Melted AlSi12 Alloy for Quasistatic and Fatigue Applications: With a Foreword by Prof. Dr. Frank Walther

Shafaqat Siddique

Informasi Umum

Kode

21.21.896

Klasifikasi

616.0754 - Physical diagnosis

Jenis

Buku - Elektronik (E-Book)

Subjek

Physical Diagnosis, Behavioral Research,

No. Rak

Dilihat

133 kali

Informasi Lainnya

Abstraksi

Selective laser melting (SLM) is an established additive manufacturing process which can manufacture intricate parts with almost full density. The competitive advantages of the process are potential of customization as well as design optimization for light-weighting. The current state of the art recommends that utilization of the technology can now be extended from rapid prototyping to serial production for functional applications. Employment of the technology for functional applications requires not only the resulting density higher than 99%; reliability of the structures under mechanical loading is the most important parameter. To ensure reliability, influence of the processing and post-processing conditions needs to be understood. As many of the applications of SLM process are in automotive and aerospace industries, fatigue reliability of the parts plays the foremost role.

This study focuses on the investigation of process chain on the material properties and the corresponding mechanical behavior. Metallographic techniques like light and electron microscopy, non-destructive micro-computed tomography are employed to investigate the material structural properties which are then used to comprehend the mechanical behavior in quasistatic, high cycle fatigue (HCF), very high cycle fatigue (VHCF) as well as in crack propagation. Role of processinduced microstructure and defects in fatigue reliability has been discussed, and a fatigue prediction methodology has been developed based on cyclic deformation behavior, statistical analysis of defects and finite element analysis. Additionally, realizability of manufacturing hybrid structures and their influence on part reliability is also investigated.

The results indicate that the quasistatic strength of SLM-processed AlSi12 alloy is higher than that of cast alloy due to process-specific structural features, and the individual processing conditions need to be customized according to the required properties. For fatigue testing, combined load increase tests with continuously varying amplitude and constant amplitude tests help expediting the optimization procedure. SLM can be used for generation of parts with localized properties. Combination of conventional and additive manufacturing can be successfully carried out with appropriate post-processing. The developed fatigue prediction methodology can be applied for SLM structures to help reduce testing effort. Finally, the essential aspects, still need to be investigated to fully exploit the potential of SLM technology, are highlighted.