Download or read book Fractographic Analysis and Microstructural Investigation of a Cast Nickel base Superalloy MAR M247 Tested Under Fatique and Creep Loading Conditions written by Jianping Yan and published by . This book was released on 1990 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Fracture Morphology of Nickel base Superalloys Tested in Fatigue and Creep fatigue at 650 C written by and published by . This book was released on 1981 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1993 with total page 938 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Fracture Morphology of Nickel Base Superalloys Tested in Fatigue and Creep Fatigue at 650 C written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-20 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fracture surfaces of compact tension specimens from seven nickel-base superalloys fatigue tested at 650 C were studied by scanning electron microscopy and optical metallography to determine the nature and morphology of the crack surface in the region of stable growth. Crack propagation testing was performed as part of an earlier study at 650 C in air using a 0.33 Hz fatigue cycle and a creep-fatigue cycle incorporating a 900 second dwell at maximum load. In fatigue, alloys with a grain size greater than 20 micrometers, HIP Astroloy, Waspaloy, and MERL 76, exhibited transgranular fracture. MERL 76 also displayed numerous fracture sites which were associated with boundaries of prior powder particles. The two high strength, fine grain alloys, IN 100 and NASA IIB-7, exhibited intergranular fracture. Rene 95 and HIP plus forged Astroloy displayed a mixed failure mode that was transgranular in the coarse grains and intergranular in the fine grains. Under creep-fatigue conditions, fracture was found to be predominantly intergranular in all seven alloys. Gayda, J. and Miner, R. V. Glenn Research Center NASA-TM-81740, E-793
Download or read book Microstructural Conditions Contributing to Fatigue Variability in P M Nickel Base Superalloys Preprint written by and published by . This book was released on 2008 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Variability in the fatigue behavior of two common nickel-base superalloys is discussed, with emphasis given to understanding the behavior of short fatigue cracks. Rene88DT and IN100 are the materials of interest. and serve important roles in many turbine engine systems. Multiple specimens of each material were tested under low cycle fatigue (LCF) conditions at elevated temperature. Two IN100 specimens that exhibited significant difference in cycles to failure and three Rene88DT specimens having dissimilar short fatigue crack growth rates were interrogated to determine the reasons for these variation. This paper will discuss the microstructure adjacent to the initiation sites in these specimens and its role in affecting the observed disparate crack growth behavior. Additionally, an image correlation technique, use to evaluate the development of strain concentrations in a Rene88DT tensile specimen at room temperature, is described. The utility of image correlation for identifying microstructural 'hot spots' (i.e., initiation sites) in concert with LCF testing is considered.
Download or read book Metals Abstracts Index written by and published by . This book was released on 1995 with total page 1390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals Abstracts written by and published by . This book was released on 1983 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Microstructural Parameters on Creep of Nickel Base Superalloy Single Crystals written by National Aeronaut Administration (Nasa) and published by . This book was released on 2020-08-05 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microstructure-sensitive creep models have been developed for Ni-base superalloy single crystals. Creep rupture testing was conducted on fourteen single crystal alloys at two applied stress levels at each of two temperatures, 982 and 1093 C. The variation in creep lives among the different alloys could be explained with regression models containing relatively few microstructural parameters. At 982 C, gamma-gamma prime lattice mismatch, gamma prime volume fraction, and initial gamma prime size were statistically significant in explaining the creep rupture lives. At 1093 C, only lattice mismatch and gamma prime volume fraction were significant. These models could explain from 84 to 94 percent of the variation in creep lives, depending on test condition. Longer creep lives were associated with alloys having more negative lattice mismatch, lower gamma prime volume fractions, and finer gamma prime sizes. The gamma-gamma prime lattice mismatch exhibited the strongest influence of all the microstructural parameters at both temperatures. Although a majority of the alloys in this study were stable with respect to topologically close packed (TCP) phases, it appeared that up to approximately 2 vol% TCP phase did not affect the 1093 C creep lives under applied stresses that produced lives of approximately 200 to 300 h. In contrast, TCP phase contents of approximately 2 vol% were detrimental at lower applied stresses where creep lives were longer. A regression model was also developed for the as-heat treated initial gamma prime size; this model showed that gamma prime solvus temperature, gamma-gamma prime lattice mismatch, and bulk Re content were all statistically significant. MacKay, Rebecca A. and Gabb, Timothy P. and Nathal, Michael V. Glenn Research Center NASA/TM-2013-217868, E-18666 WBS 473452.02.03.05.04.01.01 NICKEL ALLOYS; MICROSTRUCTURE; SINGLE CRYSTALS; CREEP PROPERTIES; HEAT RESISTANT ALLOYS; CREEP TESTS; REGRESSION ANALYSIS; CRYSTAL LATTICES; CLOSE PACKED LATTICES; TURBINE BLADES; MATHEMATICAL MODELS; HIGH TEMPERATURE; CONCENTRATION (COMPOSITION); TEMPERATURE DEPENDENCE
Download or read book Relations Between Microstructure and Creep rupture Properties of Nickel base Alloys as Revealed by Overtemperature Exposures written by John P. Rowe and published by . This book was released on 1962 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microstructural Analysis written by J. McCall and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: During recent years, people involved in developing new metals and materials for use in some of the rather extreme conditions of stress, temperature, and environment have relied heavily on the microstructural condition of their materials. In fact, many of the newer materials, such as dispersion-strengthened alloys, have been designed almost entirely by first determining the microstruc ture desired and then finding the right combination of composition, heat treatment, and mechanical working that will result in the de sired microstructure. Furthermore, the extremely high reliability required of materials used today, for example, in aerospace and nuclear energy systems, requires close control on the microstruc tural conditions of materials. This is clearly evident from even a cursory examination of recently written specifications for mate rials where rather precise microstructural parameters are stipu lated. Whereas specifications written several years ago may have included microstructural requirements for details such as ASTM grain size or graphite type, today's specifications are beginning to include such things as volume fraction of phases, mean free path of particles, and grain intercept distances. Rather arbitrary terms such as "medium pearlite" have been replaced by requirements such as "interlamella spacing not to exceed 0. 1 micron. " Finally, materials users have become increasingly aware that when a material does fail, the reason for its failure may be found by examining and "reading" its microstructure. The responsibility for a particular microstructure and a resulting failure is a matter of growing importance in current product liability consider ations.
Download or read book Fractographic and Microstructural Analysis of Fatigue Specimens of A302 Grade B Steel Tested in Air at Room Temperature written by G. Gabetta and published by . This book was released on 1979 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microstructure and Internal Strains of Undeformed and Creep Deformed Samples of a Nickel base Superalloy written by Uwe Glatzel and published by . This book was released on 1994 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microstructural Responses of a Nickel base Cast IN 738 Superalloy to a Variety of Pre weld Heat treatments written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microstructural Responses of a Nickel Base Cast IN 738 Superalloy to a Variety of Pre weld Heat treatments written by Anurag Thakur and published by . This book was released on 1998 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Microstructure on the Fatigue Crack Growth Resistance of Nickel Base Superalloys written by Stephen D. Antolovich and published by . This book was released on 1987 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study is to determine the effect of microstructural properties on the fatigue crack propagation (FCP) response of nickel base superalloys. This report describes the results of four experimental alloys containing various amounts of aluminum, titanium, and molybdenum. Chemistry, precipitate size, and grain size were varied to produce systematically controlled microstructures. The four alloys were characterized for chemical composition, microstructure, tensile properties, low cycle fatigue (LCF), and FCP resistance. The FCP tests were performed under constant load (increasing K) conditions in air at a stress ratio (R) of 0.1 and 0.8. Closure loads were measured with a clip gage, back-face strain gage, and a laser extensometer. Keywords: Fatigue crack propagation, Nickel base superalloys, Microstructure, Closure, Mismatch, Anti phase boundary.
Download or read book Ni Based Superalloys written by James Coakley and published by Trans Tech Publications Ltd. This book was released on 2020-07-28 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aggregated Book
Download or read book The Microstructural Dependence of Fatigue Crack Growth Rates in a Nickel base Superalloy written by Erik Arthur Schwarzkopf and published by . This book was released on 1989 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
