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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:
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ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (683 download)
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.
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ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (683 download)
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.
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:
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ISBN 13 :
Total Pages : 15 pages
Book Rating : 4.:/5 (682 download)
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.
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:
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ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (684 download)
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.
Author : Stefano Spigarelli
Publisher : MDPI
ISBN 13 : 3039218786
Total Pages : 212 pages
Book Rating : 4.0/5 (392 download)
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.
Author : Philip A. Clarkin
Publisher :
ISBN 13 :
Total Pages : 90 pages
Book Rating : 4.:/5 (31 download)
Download or read book Influence of Certain Composition and Fabrication Variables on the Stress-rupture Properties of a Cobalt-base Alloy Consolidated by Powder Metallurgy written by Philip A. Clarkin and published by . This book was released on 1962 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : A. Strang
Publisher : Woodhead Publishing Limited
ISBN 13 :
Total Pages : 496 pages
Book Rating : 4.3/5 (91 download)
Download or read book Microstructural Stability of Creep Resistant Alloys for High Temperature Plant Applications written by A. Strang and published by Woodhead Publishing Limited. This book was released on 1998 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second in a series of international conferences focusing attention on the microstructural changes occurring in high temperature materials during service exposure and identifying the processes and mechanisms leading to the observed degradation of their mechanical properties. Highlights the work in progress to develop improved high temperature materials more resistant to microstructural degradation in service.
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ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (317 download)
Download or read book Creep-rupture Behavior of a Developmental Cast-iron-base Alloy for Use Up to 800 Deg C written by and published by . This book was released on 1987 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kenneth George Kubarych
Publisher :
ISBN 13 :
Total Pages : 260 pages
Book Rating : 4.:/5 (29 download)
Download or read book The Effects of Composition and Heat Treatments on the Strength and Ductility of Fe-Cr-Co Alloys written by Kenneth George Kubarych and published by . This book was released on 1980 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : john F. Ewing, J. W. Freeman
Publisher :
ISBN 13 :
Total Pages : 118 pages
Book Rating : 4.3/5 (91 download)
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:
Author : A.I. Rush
Publisher :
ISBN 13 :
Total Pages : 69 pages
Book Rating : 4.L/5 ( download)
Download or read book STATISTICAL EVALUATION OF THE CREEP-RUPTURE PROPERTIES OF FOUR HEAT-RESISTANT ALLOYS IN SHEET FORM written by A.I. Rush and published by . This book was released on 1954 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ward F. Simmons
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.3/5 (91 download)
Download or read book Rupture Strengths of Selected High-iron, Nickel-base, Cobalt-base, and Refractory Metal Alloys written by Ward F. Simmons and published by . This book was released on 1968 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rupture strengths, in graphical form, are presented for selected superalloys at 100 hours and 1000 hours, and for selected refractory metal alloys at 10 hours and 100 hours. Nominal chemical compositions are tabulated for all of the alloys covered. (Author).
Author : J. Daniel Whittenberger
Publisher :
ISBN 13 :
Total Pages : 76 pages
Book Rating : 4.:/5 (317 download)
Download or read book Creep and Residual Mechanical Properties of Cast Superalloys and Oxide Dispersion Strengthened Alloys written by J. Daniel Whittenberger and published by . This book was released on 1981 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : FOREST C. MONKMAN
Publisher :
ISBN 13 :
Total Pages : 1 pages
Book Rating : 4.:/5 (227 download)
Download or read book The Effect of Composition and Structure on the Creep Rupture Properties of 18-8 Stainless Steels written by FOREST C. MONKMAN and published by . This book was released on 1955 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:
