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Heat Treatment Effects For Improved Creep Rupture Resistance Of A Fe3al Based Alloy
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Book Synopsis Heat Treatment Effects for Improved Creep-Rupture Resistance of a Fe3Al-Based Alloy by :
Download or read book Heat Treatment Effects for Improved Creep-Rupture Resistance of a Fe3Al-Based Alloy written by and published by . This book was released on 1997 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The iron aluminide alloy FA-180, an Fe3Al-based alloy with a composition of Fe-28Al-5Cr-0.5Nb-0.8Mo-0.025Zr-0.05C-0.005B (at.%), is of interest because of its improved creep-rupture resistance when compared to other Fe3Al and FeAl-based alloys. Creep-rupture testing at 593 C and 207 MPa shows that FA-180 has a rupture life of approximately 100 h in the warm-rolled and stress relieved (1 h at 700-750 C) condition as compared to about 20 h for the FA-129 base alloy (Fe-28Al-5Cr-0.5Nb-0.2C). This report summarizes studies conducted in the last several years to determine the creep-rupture resistance of FA-180 as a function of the microstructures produced by varying the heat treatment temperature and cooling procedures. Solution-annealing for 1 h at 1150 C (air cooled) dramatically improved the creep-rupture life of FA-180 to about 2000 h. Transmission electron microscopy analysis showed that this strengthening was due to the precipitation of fine ZrC in the matrix and along grain boundaries. A further improvement in creep-rupture life to over 6000 h resulted from increasing the cooling rate (by quenching in oil or water) after solution annealing at 1150 C. The microstructure of the quenched specimen contained many fine dislocation loops instead of precipitates. During creep testing, these small loops evolved into a structure of larger dislocation loops and networks, resulting in significant strengthening at temperatures of 593-700 C.
Book Synopsis Effects of Composition and Heat Treatment at 1150°C on Creep-rupture Properties of Fe3Al-based Alloys by :
Download or read book Effects of Composition and Heat Treatment at 1150°C on Creep-rupture Properties of Fe3Al-based Alloys written by and published by . This book was released on 1995 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of composition and heat treatment at 1150°C on the creep-rupture properties of Fe3Al-based alloys were studied. Tests of alloy FA-180 (Fe-28Al-5Cr-0.5Nb-0.8Mo-0.025Zr-0.05C-0.005B, at.%) with this heat treatment were performed in air using various test temperatures and stresses in order to obtain creep activation energies and constants. An activation energy for creep of approximately 150 kcal/mole was determined, value which is approximately twice that obtained earlier for the binary alloy heat treated at 750°C. Tests were also conducted on alloys containing various combinations of Cr, Mo, Nb, Zr, C, and B in order to better understand the effect of composition on the improved creep resistance with heat treating at 1150°C. The results suggest an interaction of Mo with Zr and Nb to produce increased creep life.
Book Synopsis Effect of Heat Treatment Temperature on Creep-rupture Properties of Fe3Al-based Alloys by :
Download or read book Effect of Heat Treatment Temperature on Creep-rupture Properties of Fe3Al-based Alloys written by and published by . This book was released on 1994 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of heat treatment at 1100 to 1250C on the creep-rupture properties of an Fe3Al-based alloy were studied. Tests were conducted at 593C (1100F) and 207 MPa (30 ksi) in air. The modes of fracture were identified using optical metallography and scanning electron microscopy. Analytical electron microscopy was also used to study characteristics of the microstructure, including dislocations, ordered domains, and precipitates. The creep results showed maximum creep-rupture resistance with a heat treatment at approximately 1150C, with significant decreases in rupture life after heat treatments at both lower and higher temperatures. The peak in creep life was associated with fine precipitates that were observed after the 1150C heat treatment and persisted during prolonged creep at 593C. Heat treatment at 1150C appeared to cause dissolution of coarser precipitates which then reprecipitated as new fine particles upon cooling or during creep. These fine precipitates then pinned dislocations and grain boundaries to produce strength during creep.
Book Synopsis Effect of Heat Treatment at 1150 C on Creep-rupture Properties of Alloy FA-180 by :
Download or read book Effect of Heat Treatment at 1150 C on Creep-rupture Properties of Alloy FA-180 written by and published by . This book was released on 1996 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The alloy FA-180, with a composition of Fe-28Al-5Cr-0.5Nb-0.8Mo-0.025Zr-0.05C-0.005B (at.%), is of interest because of its improved creep-rupture resistance when compared to alloy FA-129 (Fe-28Al-5Cr-0.5Nb-0.2C). At a temperature of 593 C and under a stress of 207 MPa, the creep-rupture life of FA-129 heat treated for 1 h at 750 C is about 20 h while the FA-180 alloy lasts approximately 100 h. Heat treatment at 1,150 C has been shown to further improve the creep life of FA-180 and creep-rupture lives of approximately 2,000 h have been attained. This strengthening was attributed to the presence of fine matrix and grain boundary Zr-rich MC precipitates that were produced by the heat treatment. The current study continues the investigation of the effect of heat treatment at 1,150 C on the improvement of creep-rupture life in alloy FA-180. As part of the effort to understand the strengthening mechanisms involved with heat treatment at 1,150 C, transmission electron microscopy was used to correlate the microstructure with the improved creep resistance. Results indicate that heat treatment at 1,150 C for 1 h, followed by rapid quenching in water or mineral oil, produces even further improvements in the creep-rupture life of this alloy. A specimen being tested at 593 C and 207 MPa was stopped after over 6000 h of life, while another specimen lasted over 1,600 h at 650 C and 241 MPa. The microstructure of the oil-quenched specimen contained many dislocation loops which were not present in the air-cooled specimens. These loops pinned dislocations during creep testing at temperatures of 593--700 C, resulting in stabilized deformation microstructure and increased creep-rupture strength.
Book Synopsis Effect of Heat Treatment at 1,150 C on Creep Rupture Properties of a Fe3Al-based Alloy by :
Download or read book Effect of Heat Treatment at 1,150 C on Creep Rupture Properties of a Fe3Al-based Alloy written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Composition and Heat Treatment at 1150degreesC on Creep-rupture Properties of Fesub 3Al-based Alloys by :
Download or read book Effects of Composition and Heat Treatment at 1150degreesC on Creep-rupture Properties of Fesub 3Al-based Alloys written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Creep and High Temperature Deformation of Metals and Alloys by : Stefano Spigarelli
Download or read book Creep and High Temperature Deformation of Metals and Alloys written by Stefano Spigarelli and published by MDPI. This book was released on 2019-12-12 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: By the late 1940s, and since then, the continuous development of dislocation theories have provided the basis for correlating the macroscopic time-dependent deformation of metals and alloys—known as creep—to the time-dependent processes taking place within the metals and alloys. High-temperature deformation and stress relaxation effects have also been explained and modeled on similar bases. The knowledge of high-temperature deformation as well as its modeling in conventional or unconventional situations is becoming clearer year by year, with new contemporary and better performing high-temperature materials being constantly produced and investigated. This book includes recent contributions covering relevant topics and materials in the field in an innovative way. In the first section, contributions are related to the general description of creep deformation, damage, and ductility, while in the second section, innovative testing techniques of creep deformation are presented. The third section deals with creep in the presence of complex loading/temperature changes and environmental effects, while the last section focuses on material microstructure–creep correlations for specific material classes. The quality and potential of specific materials and microstructures, testing conditions, and modeling as addressed by specific contributions will surely inspire scientists and technicians in their own innovative approaches and studies on creep and high-temperature deformation.
Book Synopsis Influence of Hot-Working Conditons on The High-Temperature Properties of a Heat-Resistant Alloy by : john F. Ewing, J. W. Freeman
Download or read book Influence of Hot-Working Conditons on The High-Temperature Properties of a Heat-Resistant Alloy written by john F. Ewing, J. W. Freeman and published by . This book was released on 1955 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Heat Treatment at 1150 C on Creep-rupture Properites of Alloy FA-180 by :
Download or read book Effect of Heat Treatment at 1150 C on Creep-rupture Properites of Alloy FA-180 written by and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-11 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structural Intermetallics, 2001 by : Kevin J. Hemker
Download or read book Structural Intermetallics, 2001 written by Kevin J. Hemker and published by Minerals, Metals, & Materials Society. This book was released on 2001 with total page 890 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the third International Symposium on Structural Intermetallics (ISSI-3), this volume focuses on the research, development, design and application of intermetallic compounds and composites, bringing together researchers and potential users and producers of such materials.
Author :Joint Committee on Effect of Temperature on the Properties of Metals Publisher : ISBN 13 : Total Pages :124 pages Book Rating :4.3/5 (91 download)
Book Synopsis Literature Surveys on Influence of Stress Concentrations at Elevated Temperatures and the Effects of Nonsteady Load and Temperature Conditions on the Creep of Metals by : Joint Committee on Effect of Temperature on the Properties of Metals
Download or read book Literature Surveys on Influence of Stress Concentrations at Elevated Temperatures and the Effects of Nonsteady Load and Temperature Conditions on the Creep of Metals written by Joint Committee on Effect of Temperature on the Properties of Metals and published by . This book was released on 1959 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High-strength Iron Aluminide Alloys by :
Download or read book High-strength Iron Aluminide Alloys written by and published by . This book was released on 1995 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Past studies have shown that binary Fe3Al possesses low creep-rupture strength compared to many other alloys, with creep-rupture lives of less than 5 h being reported for tests conducted at 593°C and 207 MPa. The combination of poor creep resistance and low room-temperature tensile density due to a susceptibility to environmentally-induced dynamic hydrogen embrittlement has limited use of these alloys for structural applications, despite their excellent corrosion properties. Improvements in room temperature tensile ductility have been realized mainly through alloying effects, changes in thermomechanical processing to control microstructure, and by control of the specimen`s surface condition. Ductilities of 10-20% and tensile yield strengths as high as 500 MPa have been reported. In terms of creep-rupture strength, small additions of Mo, Nb, and Zr have produced significant improvements, but at the expense of weldability and room-temperature tensile ductility. Recently an alloy containing these additions, designated FA-180, was shown to exhibit a creep-rupture life of over 2000 h after a heat treatment of 1 h at 1150°C. This study presents the results of creep-rupture tests at various test temperatures and stresses and discusses the results as part of our effort to understand the strengthening mechanisms involved with heat treatment at 1150°C.
Book Synopsis High Temperature Aluminides and Intermetallics by : S.H. Whang
Download or read book High Temperature Aluminides and Intermetallics written by S.H. Whang and published by Elsevier. This book was released on 2013-10-22 with total page 759 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume of proceedings is concerned with an increasingly important area, that of intermetallics and high temperature aluminides, which has recently been attracting a great deal of attention. Nearly 150 papers presented at the meeting held in San Diego in September 1991 are reproduced here. They cover a wide range of related topics such as the bonding characteristic and alloying behaviour of TiA1 intermetallic compounds and the cleavage fracture of ordered intermetallic alloys. All the papers have been reviewed according to the standards set by Materials Science and Engineering. This book will be of interest to metallurgists and materials scientists working with composites who are interested in the latest developments in this fast–moving field.
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2018 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fundamentals of Creep in Metals and Alloys by : Michael E. Kassner
Download or read book Fundamentals of Creep in Metals and Alloys written by Michael E. Kassner and published by Elsevier. This book was released on 2004-04-06 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: * Numerous line drawings with consistent format and units allow easy comparison of the behavior of a very wide range of materials * Transmission electron micrographs provide a direct insight in the basic microstructure of metals deforming at high temperatures * Extensive literature review of over 1000 references provide an excellent reference document, and a very balanced discussion Understanding the strength of materials at a range of temperatures is critically important to a huge number of researchers and practitioners from a wide range of fields and industry sectors including metallurgists, industrial designers, aerospace R&D personnel, and structural engineers. The most up-to date and comprehensive book in the field, Fundamentals of Creep in Metals and Alloys discusses the fundamentals of time-dependent plasticity or creep plasticity in metals, alloys and metallic compounds. This is the first book of its kind that provides broad coverage of a range of materials not just a sub-group such as metallic compounds, superalloys or crystals. As such it presents the most balanced view of creep for all materials scientists. The theory of all of these phenomena are extensively reviewed and analysed in view of an extensive bibliography that includes the most recent publications in the field. All sections of the book have undergone extensive peer review and therefore the reader can be sure they have access to the most up-to-date research, fully interrogated, from the world’s leading investigators. · Numerous line drawings with consistent format and units allow easy comparison of the behavior of a very wide range of materials· Transmission electron micrographs provide a direct insight in the basic microstructure of metals deforming at high temperatures· Extensive literature review of over 1000 references provide an excellent reference document, and a very balanced discussion
