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Author: M. Arivarasu
Publisher:
ISBN:
Category : Technology
Languages : en
Pages :
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Book Description
Hot corrosion of the weldment is the result of the reaction between oxidation and sulfidation, which affects welded joints exposed to combustion gases containing sulfate coal ash at high temperature. It is also demonstrated that welding processes, weld consumables, temperature of exposure, and mixture of salt environment are important factors in hot corrosion of the weldment.
Author: M. Arivarasu
Publisher:
ISBN:
Category : Technology
Languages : en
Pages :
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Book Description
Hot corrosion of the weldment is the result of the reaction between oxidation and sulfidation, which affects welded joints exposed to combustion gases containing sulfate coal ash at high temperature. It is also demonstrated that welding processes, weld consumables, temperature of exposure, and mixture of salt environment are important factors in hot corrosion of the weldment.
Author: Vijay Kumar
Publisher: LAP Lambert Academic Publishing
ISBN: 9783848444182
Category :
Languages : en
Pages : 80
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Book Description
Dissimilar-metal joints are used widely in various industrial applications due to both technical and economic reasons. The materials used for high temperature applications are subjected to hot corrosion and high temperature wear.The present work deals with to evaluate the behaviour of un-welded and dissimilar weldments of AISI 304 steel and 20MnMoNi55 steel made by TIG welding at temperature 900 C, samples when exposed to high temperature oxidation in air and molten 75%wt sodium sulphate + 25%wt potassium sulphate salt under cyclic condition. Compare the oxidation and hot corrosion performance of the un-welded steel with dissimilar weldments sample and evaluate its suitability for using in boiler applications. The experiments are conduct in laboratory under cyclic condition and after high temperature oxidation, hot corrosion studies were characterized by the techniques such as XRD, SEM/EDAX and X-ray mapping to know an insight corrosion mechanism based on morphology of the corroded products formed on the un-welded and dissimilar weldments sample.The result shows that corrosion resistance is in order of AISI304-DSW- 20MnMoNi55 in both air as well as in molten salt environment.
Author: Joseph R. Davis
Publisher: ASM International
ISBN: 1615030514
Category : Technology & Engineering
Languages : en
Pages : 228
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Book Description
Corrosion failures of industrial components are commonly associated with welding. The reasons are many and varied. For example, welding may reduce the resistance to corrosion and environmentally assisted cracking by altering composition and microstructure, modifying mechanical properties, introducing residual stress, and creating physical defects. This book details the many forms of weld corrosion and the methods used to minimize weld corrosion. Chapters on specific alloys groups--carbon and alloy steels, stainless steels, high-nickel alloys, and nonferrous alloys--describe both general welding characteristics and the metallurgical factors that influence corrosion behavior. Corrosion problems associated with dissimilar metal weldments are also examined. Case histories document corrosion problems unique to specific industries including oil and gas, chemical processing, pulp and paper, and electric power. Special challenges caused by high-temperature environments are discussed. Commonly used methods to monitor weld corrosion and test methods for evaluation of intergranular, pitting, crevice, stress-corrosion cracking, and other forms of corrosion are also reviewed.
Author: Zaki Ahmad
Publisher: BoD – Books on Demand
ISBN: 9535125079
Category : Technology & Engineering
Languages : en
Pages : 158
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Book Description
High temperature corrosion is an extremely important area of corrosion as it causes the failure of high temperature equipment in process industry and power generation. Every engineer is required to obtain a basic knowledge of high temperature corrosion to prevent the colossal damage caused by it. This book contains chapters ranging from basic to advance topics to create an understanding of high temperature of various metals and alloys. With the emerging technologies such as nanotechnology, their role in controlling high temperature corrosion needs to be comprehended and new techniques developed to control high temperature corrosion. It is hoped that this book would fulfill these objectives and aspirations of the readers. Note from the publisher: It is with great sadness and regret that we inform the contributing authors and future readers of this book that the Editor, Prof. Zaki Ahmad passed away shortly after finishing the book and before having a chance to see its publication. Prof. Ahmad was InTech's long term collaborator and edited his first book with us in 2011 (''Recent Trends in Processing and Degradation of Aluminium Alloys''). The book ''High Temperature Corrosion'' was his fourth edited volume. The fruitful collaboration continued until his final days when he was acting as a co-editor on a book ''Wastewater Treatment and Resource Recovery''. We would like to acknowledge Dr. Zaki Ahmad's contribution to open access scientific publishing, which he made during 6 years of dedicated work on edited volumes and express our gratitude for his pleasant cooperation with us.
Author: George Y. Lai
Publisher: ASM International
ISBN: 1615030557
Category : Technology & Engineering
Languages : en
Pages : 469
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Book Description
George Lai's 1990 book, High-Temperature Corrosion of Engineering Alloys, is recognized as authoritative and is frequently consulted and often cited by those in the industry. His new book, almost double in size with seven more chapters, addresses the new concerns, new technologies, and new materials available for those engaged in high-temperature applications. As we strive for energy efficiency, the realm of high-temperature environments is expanding and the need for information on high temperature materials applications was never greater. In addition to extensive expansion on most of the content of the original book, new topics include erosion and erosion-corrosion, low NOx combustion in coal-fired boilers, fluidized bed combustion, and the special demands of waste-to-energy boilers, waste incinerators, and black liquor recovery boilers in the pulp and paper industry. The corrosion induced by liquid metals is discussed and protection options are presented.
Author: Ravindra Kumar
Publisher:
ISBN:
Category : Tubes, Steel
Languages : en
Pages : 9
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Book Description
Hot corrosion is a serious problem in fired tube boiler materials. The deposition of oxalates from the water side does not allow the proper transfer of heat, resulting in overheating. This leads to catastrophic failures of boiler materials. In this study, GrA1 boiler tube steel was selected as a candidate material because it is used in several thermal power plants. Hot corrosion studies were conducted on different regions, i.e., base metal, weld metal, and heat-affected zone (HAZ) of tungsten inert gas (TIG) weldment in GrA1 steel in a molten salt (Na2SO4-60 % V2O5) environment at 900°C under cyclic conditions. The thermogravimetric technique was used to establish the kinetics of corrosion. The corrosion products formed on different regions of TIG welded steel were characterized by scanning electron microscopy with energy-dispersive X-ray analysis and X-ray diffraction pattern. Base metal was found to oxidize at much higher rates than those of weld metal and HAZ.
Author: G. Y. Lai
Publisher: ASM International(OH)
ISBN:
Category : Science
Languages : en
Pages : 256
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Book Description
The purpose of this book is to provide engineers with extensive up-to-date high-temperature corrosion data pertinent to real industrial problems. The focus is on commercial alloys and deals with oxidation; carburization and metal dusting; nitridation; halogen corrosion; sulfidation; ash/salt deposit corrosion; molten salt corrosion; molten metal corrosion.
Author: Matthew J. Donachie
Publisher: ASM International
ISBN: 1615030646
Category : Heat resistant alloys
Languages : en
Pages : 439
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Book Description
This book covers virtually all technical aspects related to the selection, processing, use, and analysis of superalloys. The text of this new second edition has been completely revised and expanded with many new figures and tables added. In developing this new edition, the focus has been on providing comprehensive and practical coverage of superalloys technology. Some highlights include the most complete and up-to-date presentation available on alloy melting. Coverage of alloy selection provides many tips and guidelines that the reader can use in identifying an appropriate alloy for a specific application. The relation of properties and microstructure is covered in more detail than in previous books.
Author: Erich Folkhard
Publisher: Springer Science & Business Media
ISBN: 3709189659
Category : Technology & Engineering
Languages : en
Pages : 289
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Book Description
When considering the operational performance of stainless steel weldments the most important points to consider are corrosion resistance, weld metal mechanical properties and the integrity ofthe weldedjoint. Mechanical and corrosion resistance properties are greatly influenced by the metallurgical processes that occur during welding or during heat treatment of welded components. This book is aimed, there fore, at providing information on the metallurgical problems that may be encountered during stainless steel welding. In this way we aim to help overcome a certain degree of insecurity that is often encountered in welding shops engaged in the welding of stainless steels and is often the cause of welding problems which may in some instances lead to the premature failure of the welded component. The metallurgical processes that occur during the welding of stainless steel are of a highly intricate nature. The present book focuses in particular on the signif icance of constitution diagrams, on the processes occurring during the solidification of weld metal and on the recrystallization and precipitation phenomena which take place in the area of the welds. There are specific chapters covering the hot cracking resistance during welding and the practical welding of a number of different stainless steel grades. In addition, recommendations are given as to the most suitable procedures to be followed in order to obtain maximum corrosion resistance and mechanical properties from the weldments.
Author: William Spraragen
Publisher:
ISBN:
Category : Corrosion and anti-corrosives
Languages : en
Pages : 454
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Book Description
The corrosion of welded joints is dependent on a number of factors such as corrosive media, temperature, method of exposure, contact with other substances, as well as the quality of the welded joint itself.
