Influence of Build Orientation on High Temperature Fatigue Crack Propagation Mechanisms in Inconel 718 Fabricated by Laser Powder Bed Fusion PDF Download
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Author: Diego Martinez De Luca
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Diego Martinez De Luca
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: T.S. Srivatsan
Publisher: CRC Press
ISBN: 1498714781
Category : Technology & Engineering
Languages : en
Pages : 448
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Book Description
Get Ready for the Future of Additive ManufacturingAdditive Manufacturing: Innovations, Advances, and Applications explores the emerging field of additive manufacturing (AM)-the use of 3D printing to make prototype parts on demand. Often referred to as the third industrial revolution, AM offers many advantages over traditional manufacturing. This pr
Author: The Minerals, Metals & Materials Society
Publisher: Springer
ISBN: 3319725262
Category : Technology & Engineering
Languages : en
Pages : 898
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Book Description
This collection features papers presented at the 147th Annual Meeting & Exhibition of The Minerals, Metals & Materials Society.
Author: Dunyong Deng
Publisher: Linköping University Electronic Press
ISBN: 9176853837
Category :
Languages : en
Pages : 69
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Book Description
Additive manufacturing (AM), also known as 3D printing, has gained significant interest in aerospace, energy, automotive and medical industries due to its capabilities of manufacturing components that are either prohibitively costly or impossible to manufacture by conventional processes. Among the various additive manufacturing processes for metallic components, electron beam melting (EBM) and selective laser melting (SLM) are two of the most widely used powder bed based processes, and have shown great potential for manufacturing high-end critical components, such as turbine blades and customized medical implants. The futures of the EBM and SLM are doubtlessly promising, but to fully realize their potentials there are still many challenges to overcome. Inconel 718 (IN718) is a nickel-base superalloy and has impressive combination of good mechanical properties and low cost. Though IN718 is being mostly used as a turbine disk material now, the initial introduction of IN718 was to overcome the poor weldability of superalloys in 1960s, since sluggish precipitation of strengthening phases ?’/?’’ enables good resistance to strain-age cracking during welding or post weld heat treatment. Given the similarity between AM and welding processes, IN718 has been widely applied to the metallic AM field to facilitate the understandings of process-microstructure-property relationships. The work presented in this licentiate thesis aims to better understand microstructures and mechanical properties EBM and SLM IN718, which have not been systematically investigated. Microstructures of EBM and SLM IN718 have been characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM) and correlated with the process conditions. Monotonic mechanical properties (e.g., Vickers microhardness and tensile properties) have also been measured and rationalized with regards to the microstructure evolutions before and after heat treatments. For EBM IN718, the results show the microstructure is not homogeneous but dependant on the location in the components, and the anisotropic mechanical properties are probably attributed to alignment of porosities rather than texture. Post heat treatment can slightly increase the mechanical strength compared to the as-manufactured condition but does not alter the anisotropy. SLM IN718 shows significantly different microstructure and mechanical properties to EBM IN718. The as-manufactured SLM IN718 has very fine dendritic microstructure and Laves phases in the interdendrites, and is “work-hardened” by the residual strains and dislocations present in the material. Mechanical properties are different between horizontally and vertically built samples, and heat treatment can minimize this difference. Results from this licentiate thesis provide the basis for the further research on the cyclic mechanical properties of EBM and SLM IN718, which would be the focus of following phase of the Ph.D. research.
Author: J A Charles
Publisher: Elsevier
ISBN: 1483141098
Category : Technology & Engineering
Languages : en
Pages : 349
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Book Description
Selection and Use of Engineering Materials, Second Edition covers the substantial development in the selection and application of materials and of associated materials. This book is organized into four parts encompassing 20 chapters that also consider the advances in materials databases and computer programs. The first part deals with the motivation, cost basis, service requirements, failure analysis, specifications, and quality control of engineering materials. The second part describes the mechanical properties of these materials, including static strength, toughness, stiffness, fatigue, creep, and temperature resistance. The third part examines the selection requirements for surface durability, such as corrosion and wear resistance. This part also explores the relationship between materials selection and materials processing, as well as the formalization of selection procedures. The fourth part provides some case studies in materials selection. This book will prove useful to materials scientists and practicing engineers.
Author: Ulrich Krupp
Publisher: John Wiley & Sons
ISBN: 3527315373
Category : Technology & Engineering
Languages : en
Pages : 312
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Book Description
This comprehensive overview of the whole field of fatigue and fracture of metallic materials covers both the theoretical background and some of the latest experimental techniques. It provides a summary of the complex interactions between material microstructure and cracks, classifying them with respect to the overall damage process with a focus on microstructurally short cracks and dynamic embrittlement. It furthermore introduces new concepts for the numerical treatment of fatigue microcrack propagation and their implementation in fatigue-life prediction models.This comprehensive overview of the whole field of fatigue and fracture of metallic materials covers both the theoretical background and the latest experimental techniques. It provides a summary of the complex interactions between material microstructure and cracks, classifying them with respect to the overall damage process. It furthermore introduces new concepts for the numerical treatment of fatigue microcrack propagation and their implementation in fatigue-life prediction models.
Author: Andrea Di Schino
Publisher: MDPI
ISBN: 3039286501
Category : Technology & Engineering
Languages : en
Pages : 260
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Book Description
Stainless steels represent a quite interesting material family, both from a scientific and commercial point of view, following to their excellent combination in terms of strength and ductility together with corrosion resistance. Thanks to such properties, stainless steels have been indispensable for the technological progress during the last century and their annual consumption increased faster than other materials. They find application in all these fields requiring good corrosion resistance together with ability to be worked into complex geometries. Despite to their diffusion as a consolidated materials, many research fields are active regarding the possibility to increase stainless steels mechanical properties and corrosion resistance by grain refinement or by alloying by interstitial elements. At the same time innovations are coming from the manufacturing process of such a family of materials, also including the possibility to manufacture them starting from metals powder for 3D printing. The Special Issue scope embraces interdisciplinary work covering physical metallurgy and processes, reporting about experimental and theoretical progress concerning microstructural evolution during processing, microstructure-properties relations, applications including automotive, energy and structural.
Author: Jonas Saarimäki
Publisher: Linköping University Electronic Press
ISBN: 9176853853
Category :
Languages : en
Pages : 63
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Book Description
Gas turbines are widely used in industry for power generation and as a power source at hard to reach locations where other possibilities for electrical power supplies are insufficient. New ways of producing greener energy is needed to reduce emission levels. This can be achieved by increasing the combustion temperature of gas turbines. High combustion temperatures can be detrimental and degrade critical components. This raises the demands on the high temperature performance of the superalloys used in gas turbine components. These components are frequently subjected to different cyclic loads combined with for example dwell-times and overloads at elevated temperatures, which can influence the crack growth. Dwell-times have been shown to accelerate crack growth and change cracking behaviour in both Inconel 718, Haynes 282 and Hastelloy X. On the other hand, overloads at the beginning of a dwell-time cycle have been shown to retard the dwell-time effect on crack growth in Inconel 718. More experiments and microstructural investigations are needed to better understand these effects. The work presented in this thesis was conducted under the umbrella of the research program Turbo Power; "High temperature fatigue crack propagation in nickel-based superalloys", where I have mainly looked at fatigue crack growth mechanisms in superalloys subjected to dwell-fatigue, which can have a devastating effect on crack propagation behaviour. Mechanical testing was performed under operation-like cycles in order to achieve representative microstructures and material data for the subsequent microstructural work. Microstructures were investigated using light optical microscopy and scanning electron microscopy (SEM) techniques such as electron channeling contrast imaging (ECCI) and electron backscatter diffraction (EBSD). The outcome of this work has shown that there is a significant increase in crack growth rate when dwell-times are introduced at maximum load (0 % overload) in the fatigue cycle. With the introduction of a dwell-time there is also a shift from transgranular to intergranular crack growth for both Inconel 718 and Haynes 282. The crack growth rate decreases with increasing overload levels in Inconel 718 when an overload is applied prior to the dwell-time. At high temperature, intergranular crack growth was observed in Inconel 718 as a result of oxidation and the creation of nanometric voids. Another observed growth mechanism was crack advance along ?-phase boundaries with subsequent oxidation of the ?-phase. This thesis comprises two parts. Part I gives an introduction to the field of superalloys and the acting microstructural mechanisms related to fatigue and crack propagation. Part II consists of five appended papers, which report the work completed as part of the project.
Author: Eslam Mohamed Mahmoud Mohamed Fayed
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Harry Chandler
Publisher: ASM International
ISBN: 9780871705655
Category : Technology & Engineering
Languages : en
Pages : 690
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Book Description
The material is contained in more than 500 datasheet articles, each devoted exclusively to one particular alloy, a proven format first used in the complementary guide for irons and steels. For even more convenience, the datasheets are arranged by alloy groups: nickel, aluminum, copper, magnesium, titanium, zinc and superalloys. The book provides very worthwhile and practical information in such areas as: compositions, trade names, common names, specifications (both U.S. and foreign), available products forms, typical applications, and properties (mechanical, fabricating, and selected others). This comprehensive resource also covers the more uncommon alloys by groups in the same datasheet format. Included are: refractory metals and alloys (molybdenum, tungsten, niobium, tantalum), beryllium copper alloys, cast and P/M titanium parts, P/M aluminum parts, lead and lead alloys, tin-rich alloys, and sintering copper-base materials (copper-tin, bronze, brass, nickel silvers).
