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 Creep fatigue Interactions in an Austenitic Stainless Steel written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A phenomenological model of the interaction between creep and fatigue in Type 304 stainless steel at elevated temperatures is presented. The model is based on a crack-growth equation and an equation governing cavity growth, expressed in terms of current plastic strain and plastic strain rate. Failure is assumed to occur when a proposed interaction equation is satisfied. Various parameters of the equations can be obtained by correlation with continuously cycling fatigue and monotonic creep-rupture test data, without the use of any hold-time fatigue tests. Effects of various wave shapes such as tensile, compressive, and symmetrical hold on the low-cycle fatigue life can be computed by integrating the damage-rate equations along the appropriate loading path. Microstructural evidence in support of the proposed model is also discussed.
Download or read book Creep fatigue interaction in a Low Alloy Bainitic Steel and an Austenitic Stainless Steel written by Ramamoorthy Srikanth and published by . This book was released on 1989 with total page 850 pages. Available in PDF, EPUB and Kindle. Book excerpt: Creep, fatigue and creep-fatigue tests with five and ten minutes hold time were conducted using smooth and modified keyhole compact tension specimens. Measurements were made of the crack initiation and propagation of a 2 1/4Cr-1Mo steel in the normalized and tempered condition and a 304 stainless steel in the annealed condition at temperature of 565$spcirc$C and 650$spcirc$C, respectively, in air. Stress redistribution times under creep loading were computed to establish the governing stress field for crack initiation and crack growth using the creep isochronous curves and an analytical solution. Smooth specimen test results were used to predict the crack initiation life under fatigue and creep-fatigue loading using the local strain approach and to predict the total life under creep loading using the reference stress approach. Microstructural analysis was carried out to identify the failure mechanisms. It was found that crack initiation occupied a major portion of the failure life under creep and creep-fatigue loading and that stress redistribution times were two orders of magnitude lower than the crack initiation times. Both materials were identified as creep-ductile, with reference stress-controlled initiation and growth behavior. Creep failure mechanism predominates after short hold times ($>$5 minutes). Creep cavitation was the failure mechanism in 304 stainless steel while exhaustion of matrix ductility with very little creep damage was the dominant failure node for 2 1/4Cr-1Mo steel under creep and creep-fatigue loading.
Download or read book Creep fatigue Interaction in Austenitic Stainless Steels written by J. Wareing and published by . This book was released on 1976 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Temperature Creep fatigue written by Ryuichi Ohtani and published by . This book was released on 1988 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A study of the interaction between creep and fatigue for an austenitic stainless steel at high temperature written by R. Elie Saheb and published by . This book was released on 1973 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Nitrogen on Creep Fatigue Interaction in Austenitic Stainless Steels at 600 C written by J-O Nilsson and published by . This book was released on 1988 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three austenitic stainless steels (AISI 316, AISI 316LN, and 253MA) have been investigated at 600°C with respect to fatigue and creep-fatigue behavior. Transmission electron microscopy showed that cross-slip and climb of dislocations are inhibited in AISI 316LN and 253MA due to the presence of nitrogen in solid solution. This results in a planar slip character and a concomitant increase in fatigue strength. However, during creep-fatigue deformation, nitrogen has an adverse effect on strength. This can be explained as an enhanced interaction between creep and fatigue due to the generation of high stresses in the grain boundary regions, caused by inhibited recovery.
Download or read book Creep Type and Fatigue Failure Interaction in a High Temperature Austenitic Stainless Steel written by A. J. Pacey and published by . This book was released on 1975 with total page 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 Creep fatigue environment Interactions written by R. M. Pelloux and published by American Society of Civil Engineers. This book was released on 1980 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of the Interaction Between Creep and Fatigue for an Austenitic Stainless Steel at High Temperature written by École polytechnique (Montréal, Québec). Département de génie mécanique and published by . This book was released on 1973 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Creep fatigue Interaction on the Substructure and Fracture Characteristics in 304 Stainless Steel written by Thomas A. Kenfield and published by . This book was released on 1974 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Creep and Creep Fatigue Intergranular Damage in Austenitic Stainless Steels written by J. Grattier and published by . This book was released on 1988 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Creep and strain controlled low-cycle fatigue tests with an imposed hold time at maximum tensile strain were carried out, mainly at 600°C, on two heats of 316L stainless steel. Very long times to failure (? 104 h) corresponding to low applied strain and long dwell period (24 h) were investigated. Both fatigue and creep damage were measured by quantitative metallography.
Download or read book Modeling and Identification of Cumulative Creep fatigue Damage in an Austenitic Stainless Steel written by Michael Aaron McGaw and published by . This book was released on 1990 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Damage Equation for Creep fatigue Interaction Total Plastic Strain Strain Rate written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A damage equation for creep-fatigue interaction is proposed. Instead of separating total plastic strain into time-dependent and time-independent components or using frequency as the controlling parameter, the problem is cast in terms of the total plastic strain and strain rate as the fundamental variables. The damage equation can be integrated to analyze the time to failure for creep and creep-fatigue loading. The method is illustrated for Types 304 and 316 austenitic stainless steel, Incoloy 800 and 2-1/4 Cr-1 Mo steel at various temperatures. Certain simplification can be made so that the method is attractive to designers of structures operating at elevated temperatures and loadings which do not necessarily involve a ''closed hysteresis loop'' type loading.
Download or read book Creep fatigue Failure in Type 316 Austenitic Stainless Steel written by and published by . This book was released on 1993 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Creep Fatigue Interaction and Cumulative Damage Evaluations for Type 304 Stainless Steel Hold Time Fatigue Test Program and Review of Multiaxial Fatigue written by E. P. Esztergar and published by . This book was released on 1972 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
