Casting Imperfections and the Fatigue Life of Al-Si Casting Alloys PDF Download
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Author: Hany Ammar
Publisher: LAP Lambert Academic Publishing
ISBN: 9783838334295
Category :
Languages : en
Pages : 132
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Book Description
Aluminum-silicon castings show great promise for several fields of engineering applications. The use of these casting components under conditions of cyclic loading has generated more interest in their fatigue properties. The fatigue performance of these alloys is strongly dependent on two factors: casting defects such as porosity, oxide films and inclusions found in the castings after production, and the microstructural constituents and features such as intermetallics, silicon particles and slip-bands. Five Al-Si casting alloys with silicon contents ranging from 7% to 17% were selected for this study all used extensively in automotive applications. The aim of this work was to investigate the effect of casting defects on the fatigue life of these alloys by correlating the sample fatigue life with the defect that initiated the fatigue crack, and to characterize these defects by their critical role in affecting the fatigue life. The effect of hot isostatic pressing (HIPping) on the fatigue life of Al-Si casting alloys also was investigated.
Author: Hany Ammar
Publisher: LAP Lambert Academic Publishing
ISBN: 9783838334295
Category :
Languages : en
Pages : 132
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Book Description
Aluminum-silicon castings show great promise for several fields of engineering applications. The use of these casting components under conditions of cyclic loading has generated more interest in their fatigue properties. The fatigue performance of these alloys is strongly dependent on two factors: casting defects such as porosity, oxide films and inclusions found in the castings after production, and the microstructural constituents and features such as intermetallics, silicon particles and slip-bands. Five Al-Si casting alloys with silicon contents ranging from 7% to 17% were selected for this study all used extensively in automotive applications. The aim of this work was to investigate the effect of casting defects on the fatigue life of these alloys by correlating the sample fatigue life with the defect that initiated the fatigue crack, and to characterize these defects by their critical role in affecting the fatigue life. The effect of hot isostatic pressing (HIPping) on the fatigue life of Al-Si casting alloys also was investigated.
Author: Hany Ammar
Publisher:
ISBN: 9781412313421
Category : Aluminum alloys
Languages : en
Pages : 0
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Book Description
Author: Yukitaka Murakami
Publisher: Elsevier
ISBN: 0080496563
Category : Technology & Engineering
Languages : en
Pages : 384
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Book Description
Metal fatigue is an essential consideration for engineers and researchers who are looking at factors that cause metals to fail through stress, corrosion, etc. This is an English translation of a book originally published in Japan in 1993, with an additional two chapters on the fatigue failure of steels and the effect of surface roughness on fatigue strength. The methodology is based on important and reliable results and may be usefully applied to other fatigue problems not directly treated in this book.
Author: John Gilbert Kaufman
Publisher: ASM International
ISBN: 0871708035
Category : Technology & Engineering
Languages : en
Pages : 350
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Book Description
J. G. (Gil) Kaufman is currently president of his consulting company, Kaufman Associates.
Author: Hüseyin Özdeș
Publisher:
ISBN:
Category : Aluminum alloys -- Fatigue -- Forecasting
Languages : en
Pages :
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Book Description
Cast aluminum alloys are common in automotive and aerospace applications due to their high strength-to-density ratio. Fracture data for cast aluminum alloys, such as fatigue life, tensile strength and elongation, are heavily affected by the structural defects, such as pores and bifilms. There have been numerous studies in which either fatigue performance or tensile deformation were characterized and linked to casting defects. However, a comprehensive study that correlates tensile and fatigue properties has not been reported. The present study is motivated to fill this gap. The main objective of the investigation is to analyze the link between tensile and fatigue performance of commonly used cast aluminum alloys, and determine whether fatigue performance of cast aluminum alloys can be predicted. To accomplish this task, four research questions were developed: (i) how well do equations developed to account for mean stress effects perform in cast aluminum alloys, especially in datasets with various levels of structural quality, (ii) is the strong correlation between fatigue life and structural quality index obtained from tensile data reported for A206 alloy castings applicable to other aerospace and automotive casting alloys, (iii) how do methods to estimate high cycle fatigue from tensile data perform with aluminum castings, and (iv) can the axial fatigue performance of an A356-T6 casting be predicted from rotating beam fatigue data. Among the three mean stress correction models analyzed by using seven datasets from the literature, the one developed by Walker with an adjustable exponent has provided the best fit. It has been hypothesized that the adjustable Walker parameter is related to the structural quality index, QT, estimated from tensile data. Results have shown that there is indeed a strong correlation between QT and the Walker parameter. Moreover the parameters of the xvi Weibull distribution estimated from corrected data have been found to be strongly influenced by the mean stress correction method used. Tensile and fatigue life data for 319, D357 and B201 aluminum alloy castings reported in the literature have been reanalyzed by using a maximum likelihood method to estimate Basquin parameters in datasets with run-outs, Weibull statistics for censored data and mean stress correction. After converting tensile data to QT, a distinct relationship has been observed between the expected fatigue life and mean quality index for all alloys. Moreover, probability of survival in fatigue life has been found to be directly linked to the proportions of the quality index distributions in two different regions, providing further evidence about the strong relationship between elongation, i.e., structural quality, and fatigue performance [1]. Specimen geometry has been found to make the largest difference whereas the two aerospace alloys, B201 and D357, with distinctly different microstructures, have followed the same relationship, reinforcing the findings in the literature that fatigue life in aluminum castings is mainly determined by the size distribution and number density of structural defects. Six methods to predict fatigue life from tensile data have been compared by using data from the literature as well as the experimental A356 data developed in this study. Results have shown that none of the six methods provide reliable results. The consistently poor performance of the methods developed for steels and wrought alloys can be attributed to the major structural defects, namely bifilms, in aluminum castings. A new method to estimate the S-N curve from tensile data have been developed by using data for seventy-one S-N curves have been collected and Basquin parameters have been determined. Analysis showed that there is a strong relationship between QT and the Basquin exponent. xvii The Basquin parameters estimated by using the empirical relationships developed in the present study have provided better fits to the same datasets tested for the six methods. Hence the model developed in this study is proposed as the most reliable method to estimate high cycle fatigue properties. Finally, three methods to convert rotating bending fatigue test results to uniaxial fatigue data have been investigated by using the data developed in this study. Results have indicated that the method developed by Esin, in which both the fatigue life and alternating stress are corrected, provide the best estimate. Analyses of fracture surfaces of broken specimens via scanning electron microscopy have shown that tensile, axial fatigue and rotating beam fatigue properties are all strongly influenced by the same structural defects, confirming the validity of the approach taken in this study.
Author: K. Yoshii
Publisher:
ISBN:
Category : Cast aluminum alloy
Languages : en
Pages : 12
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Book Description
Plain fatigue and fretting fatigue tests were carried out using cast Al-Si aluminum alloy JIS AC4CH-T6 and forged aluminum alloy JIS 6061-T6. Plain fatigue strength of the cast aluminum alloy was lower than that of the forged alloy. The lower fatigue strength was attributed to casting defects such as pores in the cast aluminum alloy, which enhanced fatigue crack formation. On the other hand, fretting fatigue strength of the cast aluminum alloy almost coincided with that of the forged alloy. No difference of tangential force coefficient and then tangential force in fretting fatigue was observed between the two materials. From fatigue crack growth tests and fretting fatigue tests interrupted at various fatigue cycles, fatigue crack growth curves and fretting crack formation life for both materials were also found to coincide with each other. These phenomena and properties resulted in the agreement of fretting fatigue strengths between the cast and forged aluminum alloys.
Author: Michael V Glazoff
Publisher: Elsevier
ISBN: 0080550231
Category : Technology & Engineering
Languages : en
Pages : 545
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Book Description
Casting Aluminum Alloys summarizes research conducted at Moscow Institute of Steel and Alloy during many decades in part together with Alcoa Inc. The research covered areas of the structure, properties, thermal resistance, corrosion and fatigue of aluminum alloys in industrial manufacturing. - Emphasis on interconnection among phase equilibria, thermodynamics and microstructure of alloys - Systematic overview of all phase diagrams with Al that are important for the development of casting aluminium alloys - Diagrams ("processing windows") of important technological properties such as castability, molten metal fluidity, tendency to hot pre-solidification cracking, porosity - Mathematical models for alloy mechanical properties facilitating the down-selection of best prospect candidates for new alloy development - New principles of design of eutectic casting aluminium alloys - Examples of successful novel casting alloy development, including alloys for high-strength applications, alloys with transition metals, and novel alloys utilizing aluminium scrap
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: Andrew J. Borland
Publisher:
ISBN:
Category : Die-casting
Languages : en
Pages : 284
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Book Description
Author: John L. Jorstad
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 376
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Book Description
