Download or read book Thermomechanical Fatigue of the Austenitic Stainless Steel AISI 304L written by R. Zauter and published by . This book was released on 1993 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: The isothermal and thermomechanical fatigue (TMF) behavior of the austenitic stainless steel AISI 304L has been studied in plastic strain control between room temperature and 1073K at a plastic strain amplitude of ??pl/2 = 0.5% in vacuum. The isothermal fatigue experiments showed a maximum of the stress amplitude connected with a change of the dislocation slip mode towards planar glide in an intermediate temperature region between about 550K and 800K as a result of dynamic strain ageing processes. The stress amplitudes in TMF tests are strongly influenced by the maximum temperature. When the maximum temperature lies below 873K and the temperature intervals extend over the full range of dynamic strain ageing, the stress amplitudes are very similar to the maximum values under isothermal conditions. With increasing maximum temperature, dynamic recovery by dislocation climb gains importance and the stress amplitudes decrease. When the maximum temperature of the TMF cycling exceeds a limit of about 1000K, dynamic recrystallization is observed. The numbers of cycles to fracture depend strongly on the phase between temperature and plastic strain. In particular, during in-phase cycling with a maximum temperature of 923K and higher, early failure occurs due to creep damage during the tensile half cycle. At maximum temperatures lower than 823K, the absence of creep phenomena results in similar cycle numbers to fracture in out-of-phase and inphase tests, respectively.
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 High Temperature Fatigue Behaviour of Austenitic Stainless Steel written by Hugo Wärner and published by Linköping University Electronic Press. This book was released on 2018-12-20 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: The global energy consumption is increasing and together with global warming from greenhouse gas emission, create the need for more environmental friendly energy production processes. Higher efficiency of biomass power plants can be achieved by increasing temperature and pressure in the boiler section and this would increase the generation of electricity along with the reduction in emission of greenhouse gases e.g. CO2. The power generation must also be flexible to be able to follow the demands of the energy market, this results in a need for cyclic operating conditions with alternating output and multiple start-ups and shut-downs. Because of the demands of flexibility, higher temperature and higher pressure in the boiler section of future biomass power plants, the demands on improved mechanical properties of the materials of these components are also increased. Properties like creep strength, thermomechanical fatigue resistance and high temperature corrosion resistance are critical for materials used in the next generation biomass power plants. Austenitic stainless steels are known to possess such good high temperature properties and are relatively cheap compared to the nickel-base alloys, which are already operating at high temperature cyclic conditions in other applications. The behaviour of austenitic stainless steels during these widened operating conditions are not yet fully understood. The aim of this licentiate thesis is to increase the knowledge of the mechanical behaviour at high temperature cyclic conditions for austenitic stainless steels. This is done by the use of thermomechanical fatigue- and creepfatigue testing at elevated temperatures. For safety reasons, the effect of prolonged service degradation is investigated by pre-ageing before mechanical testing. Microscopy is used to investigate the microstructural development and resulting damage behaviour of the austenitic stainless steels after testing. The results show that creep-fatigue interaction damage, creep damage and oxidation assisted cracking are present at high temperature cyclic conditions. In addition, simulated service degradation resulted in a detrimental embrittling effect due to the deterioration by the microstructural evolution.
Download or read book Effect of Creep and Oxidation on the Isothermal and Thermomechanical Fatigue Behavior of an Austenitic Stainless Steel written by Hans-Jürgen Christ and published by . This book was released on 2011 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Austenitic stainless steels are often used for high-temperature applications under conditions where fatigue loading occurs in combination with varying temperatures, superimposed mean stresses or dwell times and environmental effects. In order to characterize and separate the various damage contributions on the deformation behavior and the damage evolution of AISI304L, isothermal and thermomechanical fatigue tests were carried out at temperatures ranging from room temperature to 800°C. The test results in combination with microstructural observations were used for an adaption and application of a simple multi-component model to predict the stress-strain response under thermomechanical fatigue conditions solely from isothermal data. A very reasonable predictive accuracy was obtained and the cyclic stress-strain calculation was directly incorporated in fatigue life assessment models. Two models, which were found to be suitable for isothermal fatigue conditions, are presented. These models were extended and applied to non-isothermal conditions. A comparison of the experimentally observed fatigue life data with the predicted values revealed that thermomechanical fatigue life can reasonably be assessed from isothermal test results, if environmental effects are correctly taken into account. Thermomechanical fatigue tests employing dwell periods indicate that the life prediction models developed are robust and conservative.
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 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 Thermo mechanical Fatigue of the Austenitic Stainless Steel 253 MA written by and published by . This book was released on 1991 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Structural Integrity written by Ian Milne and published by Elsevier. This book was released on 2003-07-25 with total page 4647 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this major reference work is to provide a first point of entry to the literature for the researchers in any field relating to structural integrity in the form of a definitive research/reference tool which links the various sub-disciplines that comprise the whole of structural integrity. Special emphasis will be given to the interaction between mechanics and materials and structural integrity applications. Because of the interdisciplinary and applied nature of the work, it will be of interest to mechanical engineers and materials scientists from both academic and industrial backgrounds including bioengineering, interface engineering and nanotechnology. The scope of this work encompasses, but is not restricted to: fracture mechanics, fatigue, creep, materials, dynamics, environmental degradation, numerical methods, failure mechanisms and damage mechanics, interfacial fracture and nano-technology, structural analysis, surface behaviour and heart valves. The structures under consideration include: pressure vessels and piping, off-shore structures, gas installations and pipelines, chemical plants, aircraft, railways, bridges, plates and shells, electronic circuits, interfaces, nanotechnology, artificial organs, biomaterial prostheses, cast structures, mining... and more. Case studies will form an integral part of the work.
Download or read book High Temperature Fatigue Behaviour of Austenitic Stainless Steel written by Hugo Wärner and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Fatigue and Corrosion Fatigue Behavior of Austenitic Stainless Steel AISI 304 After Deep Rolling at Various Temperatures written by Juthathip Kongthep and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermomechanical Fatigue Behavior of Stainless Steel Grades for Automotive Exhaust Manifold Applications written by C. Simon and published by . This book was released on 2003 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes a study performed on the thermomechanical fatigue behavior of stainless steel grades for exhaust systems, especially for exhaust manifolds. A testing rig has been developed to characterize the thermomechanical fatigue resistance of bent stainless steel sheets. In particular, the behaviors of ferritic and austenitic stainless steels are compared. After the identification of the elasto-viscoplastic constitutive law of the materials, the numerical simulation of the test is performed, enabling the computation of the viscoplastic strain accumulated during each cycle. Examination of the failed specimens indicated that cracks could be mainly attributed to out-of-phase thermomechanical fatigue in the case of ferritic grades and to in-phase thermomechanical fatigue in the case of austenitic grades. A Taira type damage criterion is proposed, which correlates the amplitude of the viscoplastic strain and the number of cycles to failure. But due to a coupling with oxidation and creep during in-phase thermomechanical fatigue, the phasing between the thermal and the mechanical loads has to be taken into account in the criteria. The hydrostatic pressure at maximum temperature is proposed as such a phasing factor.
Download or read book The Application of a Biaxial Isothermal Fatigue Model to Thermomechanical Loading for Austenitic Stainless Steel written by SY. Zamrik and published by . This book was released on 2000 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: A biaxial thermomechanical fatigue (TMF) model has been developed by extending a biaxial fatigue model for isothermal condition. The proposed model assesses the in-phase and out-of-phase type cycle incorporating the effect of oxidation and creep. The isothermal fatigue model utilizes the concept of triaxiality factor (TF), which accounts for the state of stress effect on the material's fracture ductility. The TMF biaxial strain ratios varied from 0 to 3.65 at cyclic temperatures of 399 to 621 °C (750 to 1150°F). All tests were strain controlled using tubular specimens. Heating was by induction and the cooling was by natural convection.
Download or read book Dynamic Mechanical Properties of AISI 304L Irradiated to 2 2 Dpa written by C. Albertini and published by . This book was released on 1981 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Effects of strain rate (10-2 to 102 s-1) and temperature (20, 400, 550°C) on the mechanical properties of the austenitic stainless steel AISI 304L irradiated to a dose of 2.2 displacements per atom are reported. The superposition of the effects of strain rate, irradiation, and high temperature causes reduction of flow stress and ductility. Further similar tests on irradiated materials previously submitted to creep and low-cycle fatigue damage are therefore necessary to calculate the behavior of reactor structures under dynamic loads generated by explosive accidents or impact of missiles or both.
Download or read book Thermomechanical Fatigue Behavior of Austenitic Stainless Tube and Pipe Steels Under Light Water Reactor Relevant Temperature Conditions and Associated Microstructural Evolution written by Mageshwaran Ramesh and published by . This book was released on 2010 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue at High Temperature written by R. P. Skelton and published by . This book was released on 1983 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Severe Plastic Deformation and Thermomechanical Processing Nanostructuring and Properties written by Andrea Bachmaier and published by MDPI. This book was released on 2021-02-11 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Severe plastic deformation (SPD) is a very attractive research field for metallic materials because it provides new possibilities for manufacturing nanostructured materials in large quantities and allows microstructural design on different hierarchical levels. The papers included in this issue address the following topics: novel SPD processes as well as recent advancements in established processing methods, microstructure evolution and grain refinement in single- and multi-phase alloys as well as composites, strategies to enhance the microstructure stability at elevated temperatures, mechanically driven phase transformations, surface nanostructuring, gradient and multilayered materials, and mechanical and physical properties of SPD-processed materials.
Download or read book Effect of Microstructure on the Fatigue Behavior of Type 304L Stainless Steel Including Mean Strain and Cyclic Rate Effects written by Jonathan W. Pegues and published by . This book was released on 2016 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, the effects of stress and strain rate on cyclic deformation, secondary hardening, martensitic phase transformation, crack initiation, and fatigue behavior of type 304L stainless steel are examined. A series of load and strain controlled uniaxial zero and non-zero mean strain fatigue tests were conducted with varying frequencies in order to investigate the effect of loading rate on fatigue behavior. The volume fraction of martensite was quantified for several tests using x-ray diffraction and electron backscatter diffraction. The loading rates were found to have a direct effect on the microstructure and fatigue behavior of the alloy investigated. Adiabatic heating from an increased rate of loading was found to effect martensite formation which is a major contributor to the secondary hardening phenomena associated with many austenitic stainless steels under cyclic loading. Also affected by the microstructural changes were cyclic deformation, crack initiation, microstructurally small crack growth, and fatigue behavior.
