Download or read book High Cycle Fatigue Behavior of Precipitation Hardened Stainless Steel Alloys in Multiphase Environments written by Richard Gianforcaro and published by . This book was released on 2014 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stainless steels are often used in marine applications due to their superior corrosion resistance and mechanical properties. However, stainless steels are susceptible to stress corrosion cracking (SCC) and corrosion fatigue. Fatigue occurs when cracks, which initiate as the result of cyclic loading, grow and eventually lead to fracture and component failure. For this reason, it is important to include fatigue in design considerations. Unfortunately, there is little data available for corrosion fatigue in marine environments. Most fatigue studies for materials in marine environments are conducted in aqueous solutions at ambient temperatures. In reality, marine environments can include periods of cyclic wetting and drying and variations in temperature. Furthermore, components often include design parameters that can shorten fatigue life such as crevices and mating surfaces. To better understand the behavior of stainless alloys in realistic marine environments, a series of high cycle fatigue tests were conducted on several alloys. Precipitation hardened and nickel alloys have been tested in environments including ambient air, immersion in solutions of 3.5 % sodium chloride (NaCl), and cyclic wetting environments at both ambient and elevated temperatures. Studies validated the importance of testing alloys in conditions representative of the actual service environment.

Download or read book Fatigue Data on Precipitation hardenable Stainless Steels written by R. J. Favor and published by . This book was released on 1960 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Environment on the Low cycle Fatigue Behavior of Type 304 Stainless Steel written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The low-cycle fatigue behavior of Type 304 stainless steel has been investigated at 593/sup 0/C in a dynamic vacuum of better than 1.3 x 10/sup -6/ Pa (10/sup -8/ torr). The results concerning the effects of strain range, strain rate and tensile hold time on fatigue life are presented and compared with results of similar tests performed in air and sodium environments. Under continuous symmetrical cycling, fatigue life is significantly longer in vacuum than in air; in the low strain range regime, the effect of sodium on fatigue life appears to be similar to that of vacuum. Strain rate (or frequency) strongly influences fatigue life in both air and vacuum. In compressive hold-time tests, the effect of environment on life is similar to that in a continuous-cycling test. However, tensile hold times are nearly as damaging in vacuum as in air. Thus, at least for austenitic stainless steels, the influence of the environment of fatigue life appears to depend on the loading waveshape.

Download or read book Effect of Sodium Environment on the Creep rupture and Low cycle Fatigue Behavior of Austenitic Stainless Steels written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Austenitic stainless steels used for in-core structural components, piping, valves, and the intermediate heat exchanger in Liquid-Metal Fast-Breeder Reactors (LMFBRs) are subjected to sodium at elevated temperatures and to complex stress conditions. As a result, the materials can undergo compositional and microstructural changes as well as mechanical deformation by creep and cyclic fatigue processes. Information is presented on the creep-rupture and low-cycle fatigue behavior of Types 304 and 316 stainless steel in the solution-annealed condition and after long-term exposure to flowing sodium. The nonmetallic impurity-element concentrations in the sodium were controlled at levels similar to those in EBR-II primary sodium. Strain-time relationships developed from the experimental creep data were used to generate isochronous stress-creep strain curves as functions of sodium-exposure time and temperature. The low-cycle fatigue data were used to obtain relationships between plastic strain range and cycles-to-failure based on the Coffin-Manson formalism and a damage-rate approach developed at ANL. An analysis of the cyclic stress-strain behavior of the materials showed that the strain-hardening rates for the sodium-exposed steels were larger than those for the annealed material. However, the sodium-exposed specimens showed significant softening, as evidenced by the lower stress at half the fatigue life. Microstructural information obtained from the different specimens suggests that crack initiation is more difficult in the long-term sodium-exposed specimens when compared with the solution-annealed material. Based on the expected carbon concentrations in LMFBR primary system sodium, moderate carburization of the austenitic stainless steels will not degrade the mechanical properties to a significant extent, and therefore, will not limit the performance of out-of-core components.

Download or read book Corrosion Fatigue Behavior of 17 4 PH Stainless Steel in Different Tempers written by CP. Lin and published by . This book was released on 2003 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Corrosion fatigue (CF) behavior in an aerated 3.5 wt% NaCl solution has been investigated for 17-4 PH stainless steels heat treated in three conditions, namely, solution annealed (SA), peak-aged (H900), and overaged (H1150) tempers. CF tests, including both high-cycle fatigue (HCF) and fatigue crack growth (FCG), were performed as a function of load ratio and frequency. S-N curves showed that smooth specimens in H900 temper under all applied cyclic loading conditions exhibited longer CF lives than H1150 while those in the SA temper lie between them. However, the Stage II FCG rates in H900 temper were significantly greater than the H1150 and SA tempers at 20 Hz but comparable to the H1150 and SA tempers at 1 Hz. This implies crack initiation and Stage I cracking played the major role in determining the entire CF life for smooth specimen. Results also indicate that an increase in load ratio results in an increase in FCG rate and reduction of fatigue life. The CF lives at low stress levels for SA temper were increased as a result of a decrease in cyclic loading frequency from 20 to 1 Hz, which might be explained by the depassivation-dissolution-repassivation processes.

Download or read book Influence of Microstructural and Load Wave Form Control on Fatigue Crack Growth Behavior of Precipitation Hardening Stainless Steels written by Kevin Richard Kondas and published by . This book was released on 1976 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: The scientific hypothesis of this work is that microstructure when acted upon by load and environment determines the fatigue-crack growth rates or life of a component. The experimental approach varied the heat treatment of two precipitation hardening martensitic alloys, 17-4 PH and 15-5 PH. Fatigue-crack growth data was correlated between materials cycled under wave forms of 10 Hz sine frequency and trapezoidal one minute hold-time for different stress range ratios and environments.

Download or read book A New Approach to Low Cycle Fatigue Behavior of a Duplex Stainless Steel Based on the Deformation Mechanisms of the Individual Phases written by Magnin T and published by . This book was released on 1988 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper concerns the low-cycle fatigue (LCF) behavior of a duplex (austenitic-ferritic) stainless steel with a 50% ferrite content. The study focuses on the damage mechanisms leading to crack initiation in the duplex alloy cycled at imposed plastic strain amplitude. Furthermore, the behavior of two other alloys of compositions close to those of the ? and ? phases is simultaneously examined and correlated to the duplex alloy cyclic properties. The LCF properties of the duplex alloy approach those of the ferrite phase at high strain amplitudes and those of the austenite phase at low strain amplitudes. Many observations confirm this result: the Coffin-Manson curves, the hardening/softening curves, the cyclic stress-strain curves, and the crack initiation sites indicate a change in the duplex behavior near a plastic strain amplitude of 10-3. The proposed analysis of the LCF behavior of the duplex alloy is based on the cyclic plastic deformation mechanisms of the ? phase (which exhibits twinning and pencil glide) and of the ? phase (with planar slip). Finally, the influence of a 3.5% NaCl solution on the LCF properties of the duplex alloy clearly underlines the occurrence in this alloy of two different types of behavior according to the applied plastic strain amplitude.

Download or read book Metals Abstracts written by and published by . This book was released on 1998 with total page 1076 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Environment Chemistry and Microstructure on the Corrosion Fatigue Behavior of Austenitic Stainless Steels in High Temperature Water written by Lindsay Beth O'Brien and published by . This book was released on 2014 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of sulfur on the corrosion fatigue crack growth of austenitic stainless steel was evaluated under Light Water Reactor (LWR) conditions of 288°C deaerated (less than 5ppb O2) water, to shed light on the accelerating effect of the LWR environment and to explore the effect of high sulfur content on the retardation of fatigue crack growth rates. Fatigue tests were performed using a trapezoidal loading pattern with rise times of 5.1, 51, 510, and 5100 seconds (fall time of 0.9, 9, 90, and 900 seconds), with Kmzx of 28.6 or 31.9 MPa[mathematical symbol]m and stress ratios (R, Pmin/Pmax) of 0.4 or 0.7. Two test materials were used to evaluate the effect of sulfur: (1) a low sulfur (

Download or read book High cycle Fatigue Behavior of Type 316 Stainless Steel at 593 C written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The available low- and high-cycle fatigue data on Type 316 stainless steel at 593 to 600°C have been combined and analyzed to provide a preliminary strain-life correlation. This correlation was then reduced by the appropriate safety factors to a design curve and compared with the ASME T-1420-1B curve. The comparison indicates that significant increases in allowable fatigue cycles should be realized when the present study is concluded.

Download or read book Metallurgical Transactions written by and published by . This book was released on 1992 with total page 966 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fatigue Behavior of Cyclically Softening and Hardening Steels Under Multiaxial Elastic Plastic Deformation written by V. Grubisic and published by . This book was released on 1985 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: To investigate the fatigue behavior of cyclically softening and hardening steels under multiaxial elastic-plastic strains, axial strain, and shear strain controlled fatigue tests under constant amplitude loading were carried out. S-N curves under axial strain and torsional pure shear as well as under combined axial strain and shear, in and out of phase, were obtained for the cyclically softening high-strength steel 30Cr-Ni-Mo 8 (similar to AISI Type 4340) and the cyclically hardening stainless steel X 10Cr-Ni-Ti 18 9 (AISI Type 321) in the region of low-cycle fatigue.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1986 with total page 1358 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metals Abstracts Index written by and published by . This book was released on 1984 with total page 1034 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book American Doctoral Dissertations written by and published by . This book was released on 1979 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1990 with total page 944 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Manufacturing and Application of Stainless Steels written by Andrea Di Schino and published by MDPI. This book was released on 2020-04-15 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stainless steels represent a quite interesting material family, both from a scientific and commercial point of view, following to their excellent combination in terms of strength and ductility together with corrosion resistance. Thanks to such properties, stainless steels have been indispensable for the technological progress during the last century and their annual consumption increased faster than other materials. They find application in all these fields requiring good corrosion resistance together with ability to be worked into complex geometries. Despite to their diffusion as a consolidated materials, many research fields are active regarding the possibility to increase stainless steels mechanical properties and corrosion resistance by grain refinement or by alloying by interstitial elements. At the same time innovations are coming from the manufacturing process of such a family of materials, also including the possibility to manufacture them starting from metals powder for 3D printing. The Special Issue scope embraces interdisciplinary work covering physical metallurgy and processes, reporting about experimental and theoretical progress concerning microstructural evolution during processing, microstructure-properties relations, applications including automotive, energy and structural.