Download or read book Thermal mechanical Fatigue Behavior of Nickel base Superalloys written by R. M. Pelloux and published by . This book was released on 1986 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thermal mechanical Fatigue Behavior of Nickel base Superalloys written by Norman J. Marchand and published by . This book was released on 19?? with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the main achievements of a 36-month research program the main objective of which was to gain more insight into the problem of crack growth under thermal mechanical fatigue (TMF) conditions. The program was arranged into five technical tasks. Under Task I, the goal was to identify the crack propagation conditions in aircraft engines (hot section) and to assess the validity of conventional fracture mechanics parameters to address TMF crack growth. The second task defined the test facilities, test specimen and the testing conditions needed to establish the effectiveness of data correlation parameters identified in Task I. Under Task III, a computerized testing system to measure the TMF behavior (LCF and CG behaviors) of various alloy systems was built. A crack propagation test program was defined and conducted under Task IV. The test variables included strain range, strain rate (frequency) and temperature. Task V correlated and generalized the Task IV data for isothermal and variable temperature conditions so that several crack propagation parameters could be compared and evaluated.

Download or read book Thermomechanical Fatigue Behavior of a Superalloy written by JL. Malpertu and published by . This book was released on 1988 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: A thermal-mechanical fatigue test facility is described to study the stress-strain behavior and fatigue damage under anisothermal conditions of materials for gas turbine blading applications. Hollow specimens are heated by a radiation furnace; a microcomputer is used to generate simultaneous strain and temperature signals and tests are conducted under closed-loop control of axial strain. A typical mechanical strain-temperature loop has been used from 600 to 1050°C (873 to 1323 K) with peak strains at intermediate temperatures. Application to IN 100, a nickel base superalloy, is reported. Crack initiation and early crack growth are shown which are deduced from a plastic replication technique. The role of oxidation has been emphasized and the life of thermal mechanical fatigue specimens was found to be in good agreement with low-cycle fatigue results at 1000°C (1273 K).

Download or read book Thermomechanical Fatigue Behaviour of Coated and Bare Nickel Based Superalloy Single Crystals written by E. Chataigner and published by . This book was released on 1996 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thermal-mechanical fatigue behaviour of chromium-aluminium coated [001] single crystals of AM1, a nickel-base superalloy for turbine blades, is studied using a "diamond" shape cycle from 600‡ to 1100‡C. Comparison with bare specimens does not show any significant difference in thermal-mechanical fatigue nor in isothermal low cycle fatigue at high temperature. Metallographic observations on fracture surfaces and longitudinal sections of specimens tested to fatigue life or to a definite fraction of expected life have shown that the major crack tends to initiate from casting micropores in the sub-surface area very early in bare and coated specimens, under low cycle fatigue or thermal-mechanical fatigue. But the interaction between oxidation and fatigue cracking seems to play a major role. A simple model proposed by Reuchet and Rémy has been identified for this single crystal superalloy. Its application to the life prediction under low cycle fatigue and thermal-mechanical fatigue for bare and coated single crystals with different orientations is shown.

Download or read book Thermomechanical Fatigue Behavior of Materials written by Michael A. McGaw and published by ASTM International. This book was released on 2003 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: "ASTM Stock Number: STP1428. - "Fourth Symposium on Thermomechanical Fatigue Behavior of Materials, held in Dallas, Texas on November 7-8, 2001. The Symposium was sponsored by ASTM Committee E08 on Fatigue and Fracture and its Subcommittee E08.05 on Cyclic Deformation and Fat. - Includes bibliographical references and indexes. ASTM International; 2011.

Download or read book Thermomechanical fatigue behavior of materials written by Michael J. Verrilli and published by ASTM International. This book was released on 1996 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thermo mechanical Fatigue Behavior of Materials written by Huseyin Sehitoglu and published by ASTM International. This book was released on 2000 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Superalloys 2012 written by Eric S. Huron and published by John Wiley & Sons. This book was released on 2012-10-02 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt: A superalloy, or high-performance alloy, is an alloy that exhibits excellent mechanical strength at high temperatures. Superalloy development has been driven primarily by the aerospace and power industries. This compilation of papers from the Twelfth International Symposium on Superalloys, held from September 9-13, 2012, offers the most recent technical information on this class of materials.

Download or read book Fatigue Life Prediction Under Thermal Mechanical Loading in a Nickel Base Superalloy written by H. Bernard and published by . This book was released on 1993 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermal-mechanical fatigue of IN-100, a cast nickel base superalloy, was previously shown to involve mainly early crack growth using either bare or aluminized specimens. This crack growth was found to be controlled by interdendritic oxidation. A model for engineering life to crack initiation is thus proposed to describe this microcrack growth phase using local stresses in a microstructural volume element at the crack tip. The identification of damage equations involves fatigue crack growth data on compact tension (CT) specimens, interdendritic oxidation kinetics measurements and fatigue crack growth on CT specimens that have been embrittled by previous oxidation at high temperature. The application of this model to life prediction is shown for low cycle fatigue and thermal-mechanical fatigue specimens of bare and coated specimens as well as for thermal shock experiments.

Download or read book Thermomechanical Fatigue Behavior of Materials written by Huseyin Sehitoglu and published by ASTM International. This book was released on 1993 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fatigue under Thermal and Mechanical Loading Mechanisms Mechanics and Modelling written by J. Bressers and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 497 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Symposium "Fatigue under Thermal and Mechanical Loading", held at Petten (The Netherlands) on May 22-24, 1995, was jointly organized by the Institute for Advanced Materials of The Joint Research Centre, E. C. , and by the Societe Fran~se de Metallurgie et de Materiaux. The fast heating and cooling cycles experienced by many high temperature components cause thermally induced stresses, which often operate in combination with mechanical loads. The resulting thermal / mechanical fatigue cycle leads to material degradation mechanisms and failure modes typical of service cycles. The growing awareness that the synergism between the combined thermal and mechanical loads can not be reproduced by means of isothermal tests, has resulted in an increasing interest in thermal and thermo-mechanical fatigue testing. This trend has been reinforced by the constant pull by industry for more performant, yet safer high temperature systems, pushing the materials to the limit of their properties. Dedicated ASTM meetings in particular have set the scene for this area of research. The proceedings of the symposium organized by D. A. Spera and D. F. Mowbray in 1975 provided a reference book on thermal fatigue which reflects the knowledge and experimental capabilities of the mid-seventies.

Download or read book Modelling of Thermo mechanical Fatigue Behavior in Superalloys written by Yavuz Kadioglu and published by . This book was released on 1992 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermo-mechanical fatigue (TMF) and isothermal fatigue (IF) behavior of coated and uncoated Mar-M247 and, uncoated Mar-M246 was studied. The Mar-M247 was coated with Alpak-S1. The coating consists of a manganese and Aluminium powder slurry that is applied by painting, dipping, or spraying with an air brush. Thermo-mechanical experiments for coated Mar-M247 were conducted under T$sb{rm min}$ = 500$spcirc$C and T$sb{rm max}$ = 871$spcirc$C conditions. Both out-of-phase and in-phase strain-temperature phasing conditions were considered. Isothermal experiments were conducted at 500$spcirc$C and 871$spcirc$C. Comparison with the uncoated Mar-M247 showed that fatigue lives of coated material could be lower than the uncoated material and the difference was as much as four folds in some cases. For uncoated Mar-M247, only thermo-mechanical out-of-phase experiments were conducted. The temperature limit considered was T$sb{rm min}$ = 500$spcirc$C and T$sb{rm max}$ = 1038$spcirc$C. SEM, Microprobe and Auger spectroscopy were used to gain insight into oxidation effects at high temperature. An experimental program for Mar-M246 was also carried out. Due to the coarse grained structure, the stress-strain response indicates variation from specimen to specimen in some cases. The effect of this variation on life does not appear significant, except at smaller strain ranges. A numerical method is also developed to estimate the stress field due to a surface inhomogeneity in an elastic half space. The technique is based on Eshelby's equivalent inclusion method. The results were used in developing a life prediction methodology for the coated superalloys.

Download or read book Bithermal Fatigue of a Nickel base Superalloy Single Crystal written by Michael J. Verrilli and published by . This book was released on 1988 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Several Metallurgical Variables on the Thermal Fatigue Behavior of Superalloys written by DH. Boone and published by . This book was released on 1973 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of several metallurgical variables on the thermal fatigue behavior of high-temperature materials systems was studied using a highly characterized high-velocity hot gas stream to produce a well-defined strain/temperature/time cycle. Metallurgical factors considered were: alloy compositions in both cast cobalt- and nickel-base superalloys, degree of microstructural refinement, grain orientation, effect of presence and morphology of carbides, surface/environmental interaction (surface stability), and protective coatings. The nickel-base alloys studied were superior or equivalent to the cobalt-base alloys when compared on uncoated and coated bases. Within a given alloy class the effect of alloy chemistry as it affects oxidation behavior was shown to be significant. On polycrystalline substrates, an inward type of diffusion aluminide coating improved fatigue performance, whereas an outward type was detrimental. "Overlay" coatings show a great deal of potential in providing an optimum in mechanical/protective response. Columnar-grained alloys when strained along the growth direction gave fatigue resistance superior to their polycrystalline counterparts. The importance of recognizing the unique compositional/microstructural/mechanical nature of a coating in achieving optimum thermal fatigue resistance for high-temperature materials systems is emphasized.

Download or read book On Thermal Fatigue of Nickel Based Superalloys written by CC. Engler-Pinto and published by . This book was released on 1996 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thermal fatigue (TF) behaviour of two single crystal nickel-based super-alloys, SRR99 and CMSX-4, is reported. Single edge wedge specimens are rapidly heated by induction heating of the wedge tip to a maximum temperature between 1000‡C and 1175‡C and cooled to 200‡C by forced air. A constant cycle period is employed for all experiments. The strain distribution along the edge of the TF specimens is measured. Changing the induction frequency leads to different strain ranges. CMSX-4 shows crack initiation always on cast microporosities. SRR99 presents an additional oxidation/spalling/re-oxidation mechanism under low strain loading. An "integrated approach" combining TF and TMF (thermo-mechanical fatigue) is proposed. The applied TMF temperature-strain cycle is deduced from the measured TF-cycle. Under this new temperature-strain cycle the crack initiation life and the total life in TMF for SRR99 are compared with the TF results.

Download or read book Multiaxial Fatigue Behavior of Two Nickel base Superalloys written by Jianping Yan and published by . This book was released on 1996 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Superalloys written by Roger C. Reed and published by Cambridge University Press. This book was released on 2008-07-31 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: Superalloys are unique high-temperature materials used in gas turbine engines, which display excellent resistance to mechanical and chemical degradation. This book introduces the metallurgical principles which have guided their development. Suitable for graduate students and researchers, it includes exercises and additional resources at www.cambridge.org/9780521859042.