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Effect Of Heat Treatment At 1150 C On Creep Rupture Properites Of Alloy Fa 180
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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 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:
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 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 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 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 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 International Symposium on Nickel and Iron Aluminides: Processing, Properties, and Applications by : Seetharama C. Deevi
Download or read book International Symposium on Nickel and Iron Aluminides: Processing, Properties, and Applications written by Seetharama C. Deevi and published by ASM International(OH). This book was released on 1997 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Heat Treatment and Structure Upon Creep Properties of Nimonic Alloys Between 750 and 950 C by : W. Betteridge
Download or read book Effect of Heat Treatment and Structure Upon Creep Properties of Nimonic Alloys Between 750 and 950 C written by W. Betteridge and published by . This book was released on 1956 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tests on nickel-chromium-cobalt alloys hardened with titanium and aluminum have shown that differences in the stress-rupture properties at 750 C, whether due to differences in content of hardening elements or to differences in heat treatment, are maintained at all temperatures up to 950 C.
Book Synopsis EFFECT OF OVERHEATING ON CREEPT-RUPTURE PROPERTIES OF M252 AND INCONEL 700 ALLOYS AT 1500 AND 1600 F by : JOHN P. ROWE, J.W. FREEMAN
Download or read book EFFECT OF OVERHEATING ON CREEPT-RUPTURE PROPERTIES OF M252 AND INCONEL 700 ALLOYS AT 1500 AND 1600 F written by JOHN P. ROWE, J.W. FREEMAN and published by . This book was released on 1960 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
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 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 Effect of Heat Treatment on Creep Properties of the Tantalum Base Alloy Astar-811c by : D. L. HARROD
Download or read book Effect of Heat Treatment on Creep Properties of the Tantalum Base Alloy Astar-811c written by D. L. HARROD and published by . This book was released on 1970 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis ASM Review of Metal Literature by : American Society for Metals
Download or read book ASM Review of Metal Literature written by American Society for Metals and published by . This book was released on 1967 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Heat Treatment Conditions on the Applied Properties of Low Alloy Creep Resisting 0.5%Cr-0.5%Mo-0.3%V Steel (CSN 15 128). by : J Sobotka
Download or read book Effect of Heat Treatment Conditions on the Applied Properties of Low Alloy Creep Resisting 0.5%Cr-0.5%Mo-0.3%V Steel (CSN 15 128). written by J Sobotka and published by . This book was released on 1989 with total page 10 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 1964 with total page 1592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
