Download or read book Fatigue Crack Propagation Behavior of 21 4Cr 1Mo Steels for Thick Wall Pressure Vessels written by RO. Ritchie and published by . This book was released on 1982 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fatigue crack propagation behavior of a series of thick-section [20.3 cm (8 in.)] 21⁄4Cr-1Mo steels has been investigated in environments of gaseous hydrogen and ambient temperature air over a wide range of growth rates from near-threshold levels (10-11 m/cycle) to 10-4 m/cycle, as part of a program to characterize potential materials for coal gasification pressure vessel applications. Normalized bainitic-ferritic microstructures (ASTM A 387, Class 2, Grade 22) have been compared with quenched and tempered fully bainitic (ASTM A 542, Class 3) and fully martensitic (ASTM A 542, Class 2) microstructures, representing a range of yield strengths from 290 to 769 MPa. Although growth rates above 10-9 m/cycle are largely unaffected by microstructure and strength level, at near-threshold growth rates there is a marked deterioration in crack propagation resistance with increasing strength which becomes accentuated for tests in hydrogen environments. Further, the influence of gaseous hydrogen on fatigue crack propagation rates is found to be particularly severe at stress intensities far below KIscc, the threshold for hydrogen-assisted growth under sustained loading. At near-threshold levels ("true corrosion fatigue" regime) the presence of hydrogen gas enhances growth rates by up to two orders of magnitude compared with air, without a significant change in fracture mechanism. At higher growth rates ("apparent stress-corrosion fatigue" regime), a second acceleration in growth rates (up to 20 times compared with air) due to hydrogen is observed above a critical Kmax-value, which is both sensitive to frequency and load ratio and is associated with a predominately intergranular fracture mode. The characteristics of these distinct regimes of hydrogen-assisted fatigue crack propagation in 21⁄4Cr-1Mo steels are discussed in the light of the potential use of these steels for coal conversion pressure vessel construction.
Download or read book Application of 2 1 4cr 1mo Steel for Thick wall Pressure Vessels written by G. S. Sangdahl and published by ASTM International. This book was released on 1982 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Damage Mechanisms and Life Assessment of High Temperature Components written by Ramaswamy Viswanathan and published by ASM International. This book was released on 1989 with total page 497 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Review of Fatigue Crack Growth of Pressure Vessel and Piping Steels in High temperature Pressurized Reactor grade Water written by W. H. Cullen and published by . This book was released on 1980 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue crack growth data sets, for pressure vessel and piping steels, in reactor-grade water environment have appeared in various reports and publications since about 1972. All of the results which have been published from 1972 through 1979 have been plotted and are presented in this report. Beginning with a discussion of the need for these data, and an explanation of the laboratory facilities which are required for this research, this report goes on to describe the overall trends which have evolved through consideration of the data sets and the conditions under which they were generated. A model for hydrogen assisted fatigue crack growth is described and applied to the pressurized water reactor type of environment. A complete listing of references is included in the report. (Author).
Download or read book Fatigue Crack Propagation in the Heat Affected Zone of 21 4Cr 1Mo Steel and ERNiCr 3 Weldments written by T. Weerasooriya and published by . This book was released on 1982 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fatigue crack growth rate at 510°C in the heat-affected zone (HAZ) of a 21⁄4Cr-1Mo steel weldment was examined as a function of frequency and stress-intensity factor. The weldment was made of isothermally annealed 21⁄4Cr-1Mo steel base metal and ERNiCr-3 weld metal. Fatigue crack growth rate data for thermally aged HAZ material lie between the two scatter bands of data for the base metal and ERNiCr3 filler metal at 510°C. Prior thermal aging up to 2000 h at 566°C does not substantially change the fatigue crack growth rate of HAZ material at 510°C. Fatigue crack growth rate of HAZ material increases with decreasing frequency at 510°C and stress ratio of 0.05 for 20 MPam
Download or read book Energy Research Abstracts written by and published by . This book was released on 1979 with total page 1180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue Crack Growth Rates in Pressure Vessel and Piping Steels in LWR Environments written by W. H. Cullen and published by . This book was released on 1987 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Low Cycle Fatigue Behavior and Crack Propagation in Some Steels written by Saurindranath Majumdar and published by . This book was released on 1974 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a previous report, a fatigue crack propagation model was analyzed by considering fatigue crack propagation as a sequence of fatigue crack initiation events. This permitted correlation to be made between the fatigue crack growth resistance and low cycle fatigue properties of metals. Four steels were tested for low cycle fatigue behavior at the University of Illinois. Good correlation was obtained between the theoretically predicted crack propagation rate based on the measured low cycle fatigue properties of the four metals and experimentally observed crack propagation rates that were reported in the literature. Further, good estimates of crack propagation rates can be obtained on the basis of static tensile properties of the metals alone where cyclic properties are not available. (Author).
Download or read book A 21 4Cr 1Mo Pressure Vessel Steel with Improved Creep Rupture Strength written by T. Ishiguro and published by . This book was released on 1982 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the ASME Boiler and Pressure Vessel Code, Sec. VIII, Div. 1, design allowable stress-intensity values are influenced by the creep rupture strength at temperatures higher than 450°C. Pressure vessels for such high-temperature service inevitably tend to be thickwalled unless a steel with high creep strength is used. In the case of a coal liquefaction reactor, for instance, a possible wall thickness would be approximately 300 mm or even greater with the use of conventional 21⁄4Cr-1Mo steel (SA336 F22).
Download or read book An Investigation of Fracture Toughness Fatigue crack Growth Sustained load Flaw Growth and Impact Properties of Three Pressure Vessel Steels written by Charles Michael Hudson and published by . This book was released on 1975 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Role of Fracture Toughness and Residual Stresses in the Fatigue and Fracture Behavior of Large Thick Walled Pressure Vessels written by Thomas E. Davidson and published by . This book was released on 1970 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summarized are the results of an investigation into the fatigue and fracture behavior of large thick-walled cylinders identical in configuration to a 175mm cannon tube. Crack growth rates and fatigue life data are presented for materials of three strength levels and different fracture toughness levels. The effects of autofrettage were examined and found to improve the fatigue life significantly. This improvement in life is shown to be the result of retardation of the fatigue crack growth rate at small crack depths. This observation, along with the relationship between fracture toughness, critical crack depth and fracture mode, is interpreted in terms of recent advancements in the application of fracture mechanics to the case of a cylinder under internal pressure. (Author).
Download or read book Near threshold Fatigue Crack Propagation in Pressure Vessel Steels written by Charles Michael Moss and published by . This book was released on 1979 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influences of Gaseous Environment on Low Growth rate Fatigue Crack Propagation in Steels Annual Report No 1 January 1980 Report No FPL R 80 1030 written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The influence of gaseous environment is examined on fatigue crack propagation behavior in steels. Specifically, a fully martensitic 300-M ultrahigh strength steel and a fully bainitic 2-1/4Cr-1Mo lower strength steel are investigated in environments of ambient temperature moist air and low pressure dehumidified hydrogen and argon gases over a wide range of growth rates from 10−8 to 10−2 mm/cycle, with particular emphasis given to behavior near the crack propagation threshold .delta.K0. It is found that two distinct growth rate regimes exist where hydrogen can markedly accelerate crack propagation rates compared to air, (1) at near-threshold levels below (5 x 10−6 mm/cycle) and (2) at higher growth rates, typically around 10−5 mm/cycle above a critical maximum stress intensity K/sub max//sup T/. Hydrogen-assisted crack propagation at higher growth rates is attributed to a hydrogen embrittlement mechanism, with K/sub max//sup T/ nominally equal to K/sub Iscc/ (the sustained load stress corrosion threshold) in high strength steels, and far below K/sub Iscc/ in the strain-rate sensitive lower strength steels. Hydrogen-assisted crack propagation at near-threshold levels is attributed to a new mechanism involving fretting-oxide-induced crack closure generated in moist (or oxygenated) environments. The absence of hydrogen embrittlement mechanisms at near-threshold levels is supported by tests showing that .delta.K0 values in dry gaseous argon are similar to .delta.K0 values in hydrogen. The potential ramifications of these results are examined in detail.
Download or read book ASM Handbook written by ASM International. Handbook Committee and published by . This book was released on 1990 with total page 1080 pages. Available in PDF, EPUB and Kindle. Book excerpt: These volumes cover the properties, processing, and applications of metals and nonmetallic engineering materials. They are designed to provide the authoritative information and data necessary for the appropriate selection of materials to meet critical design and performance criteria.
Download or read book Fatigue Crack Propagation and Fracture Studies of a Pressure Vessel Steel Temper Embrittled to Simulate Irradiation Damage written by T. W. Crooker and published by . This book was released on 1967 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue crack propagation tests were conducted using plate bend specimens machined from shell material of the PM-2A half-scale model pressure vessel. The material is a Cr-Mo-V rotor steel, temper embrittled to represent the irradiated shell of the PM-2A reactor vessel. The fatigue tests were conducted in a room-air environment at 80 F, which is 160 F below the NDT (nil-ductility transition) temperature for this steel. Fatigue crack growth rates were correlated with total strain range, and were found to be similar to fatigue crack growth rates in other structural steels which possess comparable yield strength levels. Fracture occurred in the plate bend specimens of the test material during fatigue cycling. This represents a significant departure from the behavior of previously studied structural steels, and is attributed to the very high NDT temperature of the test material. An analysis of the fractures using an approximate solution for the stress-intensity factor, K, gave good agreement with previous plane strain fracture toughness measurements on the test material. (Author).
Download or read book Metals Abstracts written by and published by . This book was released on 1994 with total page 1440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Data Sheets on Fatigue Crack Propagation Properties for Butt Welded Joints of SB42 Carbon Steel Plate for Boilers and Other Pressure Vessels written by and published by . This book was released on 1984 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
