Effect of Microstructure and Defects on the Fatigue Behaviour of Cast A356-T6 Aluminium-silicon Alloy PDF Download
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Languages : en
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Languages : en
Pages : 364
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Author: Phalgun Nelaturu
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 87
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Book Description
Metal fatigue is a recurring problem for metallurgists and materials engineers, especially in structural applications. It has been responsible for many disastrous accidents and tragedies in history. Understanding the micro-mechanisms during cyclic deformation and combating fatigue failure has remained a grand challenge. Environmental effects, like temperature or a corrosive medium, further worsen and complicate the problem. Ultimate design against fatigue must come from a materials perspective with a fundamental understanding of the interaction of microstructural features with dislocations, under the influence of stress, temperature, and other factors. This research endeavors to contribute to the current understanding of the fatigue failure mechanisms. Cast aluminum alloys are susceptible to fatigue failure due to the presence of defects in the microstructure like casting porosities, non-metallic inclusions, non-uniform distribution of secondary phases, etc. Friction stir processing (FSP), an emerging solid state processing technique, is an effective tool to refine and homogenize the cast microstructure of an alloy. In this work, the effect of FSP on the microstructure of an A356 cast aluminum alloy, and the resulting effect on its tensile and fatigue behavior have been studied. The main focus is on crack initiation and propagation mechanisms, and how stage I and stage II cracks interact with the different microstructural features. Three unique microstructural conditions have been tested for fatigue performance at room temperature, 150 °C and 200 °C. Detailed fractography has been performed using optical microscopy, scanning electron microscopy (SEM) and electron back scattered diffraction (EBSD). These tools have also been utilized to characterize microstructural aspects like grain size, eutectic silicon particle size and distribution. Cyclic deformation at low temperatures is very sensitive to the microstructural distribution in this alloy. The findings from the room temperature fatigue tests highlight the important role played by persistent slip bands (PSBs) in fatigue crack initiation. At room temperature, cracks initiate along PSBs in the absence of other defects/stress risers, and grow transgranularly. Their propagation is retarded when they encounter grain boundaries. Another major finding is the complete transition of the mode of fatigue cracking from transgranular to intergranular, at 200 °C. This occurs when PSBs form in adjacent grains and impinge on grain boundaries, raising the stress concentration at these locations. This initiates cracks along the grain boundaries. At these temperatures, cyclic deformation is no longer microstructure- dependent. Grain boundaries don't impede the progress of cracks, instead aid in their propagation. This work has extended the current understanding of fatigue cracking mechanisms in A356 Al alloys to elevated temperatures.
Author: Hayri Baytan Ozmen
Publisher: BoD – Books on Demand
ISBN: 183880448X
Category : Technology & Engineering
Languages : en
Pages : 186
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Book Description
Fracture mechanics deals with the cracking behavior of materials, and cracking defines the limit state for many components of engineering systems. Fracture mechanics principles can help us design more robust components to ensure safer airplanes, space shuttles, ships, cranes, buildings, bridges, and mechanical systems. Written by researchers and experts of the field, this book examines recent progress in fracture mechanics applications. Chapters cover such topics as rupture theory, the J-integral, knitted fabric-reinforced polymer composites, and artificial neural networks to detect structural damage, among others. This volume is designed for graduate students, researchers, and practicing engineers.
Author: Maurizio Vedani
Publisher: MDPI
ISBN: 3039289195
Category : Technology & Engineering
Languages : en
Pages : 238
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Book Description
There is growing interest in light metallic alloys for a wide number of applications owing to their processing efficiency, processability, long service life, and environmental sustainability. Aluminum, magnesium, and titanium alloys are addressed in this Special Issue, however, the predominant role played by aluminum. The collection of papers published here covers a wide range of topics that generally characterize the performance of the alloys after manufacturing by conventional and innovative processing routes.
Author: The Minerals, Metals & Materials Society (TMS)
Publisher: John Wiley & Sons
ISBN: 1118356977
Category : Technology & Engineering
Languages : en
Pages : 909
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Book Description
This book contains chapters on cutting-edge developments presented at the TMS annual conference of 2012.
Author: George E. Totten
Publisher: CRC Press
ISBN: 1351045628
Category : Science
Languages : en
Pages : 2957
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Book Description
This encyclopedia, written by authoritative experts under the guidance of an international panel of key researchers from academia, national laboratories, and industry, is a comprehensive reference covering all major aspects of metallurgical science and engineering of aluminum and its alloys. Topics covered include extractive metallurgy, powder metallurgy (including processing), physical metallurgy, production engineering, corrosion engineering, thermal processing (processes such as metalworking and welding, heat treatment, rolling, casting, hot and cold forming), surface engineering and structure such as crystallography and metallography.
Author: Qigui Wang
Publisher: Wiley-TMS
ISBN:
Category : Science
Languages : en
Pages : 406
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Book Description
This book reviews the latest developments and applications of modeling and simulation techniques in aluminum shape castings, and the need for improvement of these computational techniques. Specifically, topics include design of both the cast aluminum alloy as well as aluminum casting and gating system; modeling, simulation and optimization of both the casting process and heat treatment; modeling and simulation of both casting defect and microstructure; prediction of mechanical performance and influence of subsequent processing on final performance. Developers and users of computational techniques applied to aluminum shape castings as well as end users of castings will find this book extremely helpful.
Author: Alan Tomsett
Publisher: Springer Nature
ISBN: 3030364089
Category : Technology & Engineering
Languages : en
Pages : 1385
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Book Description
The Light Metals symposia at the TMS Annual Meeting & Exhibition present the most recent developments, discoveries, and practices in primary aluminum science and technology. The annual Light Metals volume has become the definitive reference in the field of aluminum production and related light metal technologies. The 2020 collection includes papers from the following symposia: • Alumina and Bauxite• Aluminum Alloys, Processing and Characterization• Aluminum Reduction Technology• Cast Shop Technology• Cast Shop Technology: Recycling and Sustainability Joint Session• Electrode Technology for Aluminum Production
Author: The Minerals, Metals & Materials Society
Publisher: Springer Nature
ISBN: 3030362965
Category : Technology & Engineering
Languages : en
Pages : 2046
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Book Description
This collection presents papers from the 149th Annual Meeting & Exhibition of The Minerals, Metals & Materials Society.
