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Collaborative Research On Thermo Mechanical And Isothermal Low Cycle Fatigue Strength Of Ni Base Superalloys And Protective Coatings At Elevated Temperatures In The Society Of Materials Science Japan Jsms
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Book Synopsis Collaborative Research on Thermo-Mechanical and Isothermal Low-Cycle Fatigue Strength of Ni-Base Superalloys and Protective Coatings at Elevated Temperatures in The Society of Materials Science, Japan (JSMS) by : Y. Yamazaki
Download or read book Collaborative Research on Thermo-Mechanical and Isothermal Low-Cycle Fatigue Strength of Ni-Base Superalloys and Protective Coatings at Elevated Temperatures in The Society of Materials Science, Japan (JSMS) written by Y. Yamazaki and published by . This book was released on 2003 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of collaborative research by "Subcommittee on Superalloys and Coatings" in The Society of Materials Science, Japan (JSMS), are presented, which cover the thermo-mechanical fatigue (TMF) and high temperature isothermal low-cycle fatigue (ILCF) strengths of Ni-Base superalloy, substrate alloys and the protective coatings. Three kinds of Ni-base superalloys were selected as the substrate: a single crystal alloy, CMSX-4; a directionally solidified alloy, CM247LC; and a polycrystalline alloy, IN738LC. On these substrate specimens the CoNiCrAlY alloy was coated by 250 ?m in thickness by low pressure plasma spraying, and then aluminized. This process was managed and undertaken by one of member companies of the Subcommittee. The round robin TMF and ILCF tests were carried out under a strain ratio of -1 at temperature ranged between 400 and 900°C. In the former the tests were performed under the out-of-phase and diamond phase conditions in which the phase difference between strain and temperature were 180° and 90°, respectively. It is shown by the round-robin tests that the TMF lives, as well as the ILCF, were strongly dependent on the substrate alloys. Many important, or noteworthy results were also found: e.g., the TMF fracture behavior of the coated specimens revealed some unique characteristics that were hardly deduced from that of the bare specimens. The effect of coating on the ILCF life was strongly dependent on the temperature. It was not reasonable, or difficult to try to estimate the TMF life of the coatings from the ILCF test results. Based on the observations on the crack initiation, propagation and the fracture surface, the effects of the substrate alloy and the coating on the TMF and ILCF lives were discussed.
Book Synopsis Thermomechanical Fatigue Behavior of Materials by : Michael A. McGaw
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.
Book Synopsis Isothermal Low Cycle Fatigue of Uncoated and Coated Nickel-base Superalloys by : Svjetlana Šteković
Download or read book Isothermal Low Cycle Fatigue of Uncoated and Coated Nickel-base Superalloys written by Svjetlana Šteković and published by . This book was released on 2004 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Influence of Sub-solvus Thermomechanical Processing on the Tensile and Low Cycle Fatigue Properties of a Solid Solution Strengthened Ni-Cr-W Superalloy by : Michael D. Fitzpatrick
Download or read book The Influence of Sub-solvus Thermomechanical Processing on the Tensile and Low Cycle Fatigue Properties of a Solid Solution Strengthened Ni-Cr-W Superalloy written by Michael D. Fitzpatrick and published by . This book was released on 1992 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Low Cycle Fatigue and Thermo-mechanical Fatigue of Uncoated and Coated Nickel-base Superalloys by : Svjetlana Šteković
Download or read book Low Cycle Fatigue and Thermo-mechanical Fatigue of Uncoated and Coated Nickel-base Superalloys written by Svjetlana Šteković and published by . This book was released on 2007 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Micromechanisms of Low-Cycle Fatigue in Nickel-Based Superalloys at Elevated Temperatures by : RM. Pelloux
Download or read book Micromechanisms of Low-Cycle Fatigue in Nickel-Based Superalloys at Elevated Temperatures written by RM. Pelloux and published by . This book was released on 1979 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: The micromechanisms of high-temperature fatigue crack initiation and crack propagation in solid-solution and precipitation-strengthened nickel-base super-alloys are reviewed. The marked decrease in fatigue strength of a given superalloy with increasing temperature cannot be solely correlated with the temperature dependence of the short-time mechanical properties. The interactions between oxidation rates and fatigue strengths are very complex. The air environment plays a large role in accelerating the initiation and propagation of fatigue cracks at elevated temperatures. Increasing temperature and decreasing frequency lead to a transition from transgranular to intergranular fracture path.
Book Synopsis Elevated Temperature Fatigue-creep Behavior of Nickel-base Superalloy in 625 by :
Download or read book Elevated Temperature Fatigue-creep Behavior of Nickel-base Superalloy in 625 written by and published by . This book was released on 1986 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Superalloy Inconel 625 is a potential candidate material for use in structural components subjected to cyclic loadings at high temperatures, such as parts of jet engines and nuclear reactors. This report discusses the results of a research program carried out to provide the mechanical properties on the low-cycle fatigue and creep-fatigue behaviour of IN 625 at elevated temperatures (650 and 815C). Under continuous cycling, the data base of the material is established and the influence of hold-times introduced in each cycle (interspersed creep-fatigue) on the material life is then examined. A life prediction procedure recently suggested was applied to the data obtained under cyclic loading, with and without hold times. The overall correlation between isothermal experimental results and theoretical predictions is discussed.
Book Synopsis Towards the Development of a Physics-Based Thermo-Mechanical Fatigue Life Prediction Model for a Single Crystalline Ni-Base Superalloy by : Robert Amaro
Download or read book Towards the Development of a Physics-Based Thermo-Mechanical Fatigue Life Prediction Model for a Single Crystalline Ni-Base Superalloy written by Robert Amaro and published by . This book was released on 2014 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: A long term effort has been underway to develop a mechanism-based model for life prediction under thermo-mechanical fatigue (TMF) cycling. A model has been developed which is based upon the impingement of slip bands upon oxidized regions and subsequent initiation of a crack due to stress concentration. The concept of an effective cycle temperature, Teff, and the dynamic nature of the material are critical components of the model and result in the ability to produce very accurate life predictions. It has also been shown that the model is capable of addressing complexities such as imposed high cycle fatigue (HCF) while still producing excellent agreement with the experiment. However, given the fact that this material is used for jet engine turbine blades and that such blades have cooling holes which act as notches, the next step in the development of this model is to incorporate it into a notched environment. The principal features of the TMF model are reviewed and a strategy for full integration into notched fatigue life prediction is discussed. Recent experimental results are presented which are based upon simulating smooth bar conditions at the notch root and a first approach to numerical simulation (called Q fit) is presented. Suggestions for further research are discussed.
Book Synopsis Enhancement of Thermomechanical Fatigue Resistance of a Monocrystalline Nickel-base Superalloy by Pre-rafting by : U. Tetzlaff
Download or read book Enhancement of Thermomechanical Fatigue Resistance of a Monocrystalline Nickel-base Superalloy by Pre-rafting written by U. Tetzlaff and published by . This book was released on 2003 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: In ?'-hardened monocrystalline nickel-base superalloys having a negative ?/?' lattice misfit, the prior introduction of so-called ?/?' rafts aligned parallel to the stress axis (by a small creep pre-deformation in compression) has been shown to enhance both the high-temperature isothermal fatigue strength and the tensile creep resistance. It was hence of interest to perform a systematic study of the thermo-mechanical fatigue (TMF) behavior of specimens of a monocrystalline nickel-base superalloy with the main aim to test whether an initial ?/?' raft microstructure can also enhance the TMF resistance. The experiments were performed on [001]-orientated monocrystalline specimens of the superalloy SRR 99 which contained either the initial ?/?'-microstructure with cuboidal ?' precipitates or a ?/?' raft microstructure aligned roughly parallel to the stress axis. The latter was introduced by a small compressive creep deformation of less than 0.4% at a temperature of 1050°C and a stress of 120 MPa. Different strain-controlled TMF cycle forms were employed. However, in most tests a counter-clockwise-diamond (CCD) cycle (temperature interval ?T = 600°C-1100°C) was used with a total strain rate of 6.67•10-5 s-1. This CCD cycle is considered to be close to service conditions. The mechanical strain range ??m was varied in the range of ??mech = 1%, leading to fatigue lives in the order of some 1000 cycles. It could be shown that pre-rafting in compression enhances the TMF fatigue life significantly for all cases of CCD-cycles investigated.
Book Synopsis Thermomechanical Fatigue Behavior of the Directionally-solidified Nickel-base Superalloy CM247LC by : Robert Anthony Kupkovits
Download or read book Thermomechanical Fatigue Behavior of the Directionally-solidified Nickel-base Superalloy CM247LC written by Robert Anthony Kupkovits and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to the extreme operating conditions present in the combustion sections of gas turbines, designers have relied heavily on specialized engineering materials. For blades, which must retain substantial strength and resistance to fatigue, creep, and corrosion at high temperatures, directionally-solidified (DS) nickel-base superalloys have been used extensively. Complex thermomechanical loading histories makes life prediction for such components difficult and subjective. Costly product inspection and refurbishment, as well as capital expense required in turbine forced outage situations, are significant drains on the resources of turbine producers. This places a premium on accurate endurance prediction as the foundation of viable long-term service contracts with customers. In working towards that end, this work characterizes the behavior of the blade material CM247LC DS subjected to a variety of in-phase (IP) and out-of phase (OP) loading cycles in the presence of notch stress concentrations. The material response to multiaxial notch effects, highly anisotropic material behavior, time-dependent deformation, and waveform and temperature cycle characteristics is presented. The active damage mechanisms influencing crack initiation are identified through extensive microscopy as a function of these parameters. This study consisted of an experimental phase as well as a numerical modeling phase. The first involved conducting high temperature thermomechanical fatigue (TMF) tests on both smooth and notched round-bar specimens to compile experimental results. Tests were conducted on longitudinal and transverse material grain orientations. Damage is characterized and conclusions drawn in light of fractography and microscopy. The influences of microstructure morphology and environmental effects on crack initiation are discussed. The modeling phase utilized various finite element (FE) simulations. These included an anisotropic-elastic model to capture the purely elastic notch response, and a continuum-based crystal visco-plastic model developed specifically to compute the material response of a DS Ni-base superalloy based on microstructure and orientation dependencies. These FE simulations were performed to predict and validate experimental results, as well as identify the manifestation of damage mechanisms resulting from thermomechanical fatigue. Finally, life predictions using simple and complex analytical modeling methods are discussed for predicting component life at various stages of the design process.
Book Synopsis Thermal-mechanical Fatigue Behavior of Nickel-base Superalloys by : R. M. Pelloux
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:
Book Synopsis Response of Nickel-Base Superalloys to Thermo-Mechanical Processing by Shock-Wave Deformation by : R. Norman Orava
Download or read book Response of Nickel-Base Superalloys to Thermo-Mechanical Processing by Shock-Wave Deformation written by R. Norman Orava and published by . This book was released on 1974 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation was conducted to study the synergistic effects of thermal treatment and explosive shock loading on the microstructure and mechanical properties of Udimet 700 and Inconel 718. The influence of such shock thermomechanical processing (TMP) is compared with that of thermal processing alone, and with that of conventional TMP by cold rolling to an effective strain equivalent to the transient shock strain. The applied peak shock pressures were 527 kbar for Udimet 700, and 510 kbar for Inconel 718, with a 1-microsec duration, and the equivalent thickness reduction by rolling was 19.1% for both materials. In general, it was found that the most favorable TMP schedules are those which involve a partial aging treatment prior to cold working. The shock TMP of Udimet 700 and Inconel 718 resulted in improvements in room and elevated temperature strengths, elevated temperature ductility and toughness in the minimum ductility region, stress-rupture life, and low-cycle fatigue life. (Modified author abstract).
Book Synopsis Thermomechanical Fatigue of Mar-M247 by : Kyle A. Brindley
Download or read book Thermomechanical Fatigue of Mar-M247 written by Kyle A. Brindley and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this work is to establish a life prediction methodology for thermomechanical loading of the Ni-base superalloy Mar-M247 over a larger temperature range than previous work. The work presented in this thesis extends the predictive capability of the Sehitoglu-Boismier unified thermo-viscoplasticity constitutive model and thermomechanical life model from a maximum temperature of 871C to a maximum temperature of 1038C. The constitutive model, which is suitable for predicting stress-strain history under thermomechanical loading, is adapted and calibrated using the response from isothermal cyclic experiments conducted at temperatures from 500C to 1038C at different strain rates with and without dwells. In the constitutive model, the flow rule function and parameters as well as the temperature dependence of the evolution equation for kinematic hardening are established. In the elevated temperature regime, creep and stress relaxation are critical behaviors captured by the constitutive model. The life model accounts for fatigue, creep, and environmental-fatigue damage under both isothermal and thermomechanical fatigue. At elevated temperatures, the damage terms must be calibrated to account for thermally activated damage mechanisms which change with increasing temperature. At lower temperatures and higher strain rates, fatigue damage dominates life prediction, while at higher temperatures and slower strain rates, environmental-fatigue and creep damage dominate life prediction. Under thermomechanical loading, both environmental-fatigue and creep damage depend strongly on the relative phasing of the thermal and mechanical strain rates, with environmental-fatigue damage dominating during out-of-phase thermomechanical loading and creep damage dominating in-phase thermomechanical loading. The coarse-grained polycrystalline microstructure of the alloy studied causes a significant variation in the elastic response, which can be linked to the crystallographic orientation of the large grains. This variation in the elastic response presents difficulties for both the constitutive and life models, which depend upon the assumption of an isotropic material. The extreme effects of a large grained microstructure on the life predictions is demonstrated, and a suitable modeling framework is proposed to account for these effects in future work.
Book Synopsis Thermal-mechanical Fatigue Behavior of Nickel-base Superalloys by : Norman J. Marchand
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.
Book Synopsis Fatigue Life Prediction Under Thermal-Mechanical Loading in a Nickel-Base Superalloy by : H. Bernard
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.
Book Synopsis On Thermal Fatigue of Nickel-Based Superalloys by : CC. Engler-Pinto
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.
Book Synopsis Thermo-mechanical Fatigue of Polycrystalline, Directionally Solidified and Single Crystal Nickel Base Superalloys Repaired by Laser Beam Welding by : Jonathan Durocher
Download or read book Thermo-mechanical Fatigue of Polycrystalline, Directionally Solidified and Single Crystal Nickel Base Superalloys Repaired by Laser Beam Welding written by Jonathan Durocher and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
